December 2009 - virt - lists.centos.org

Fedora 12 2.6.31.5-127.fc12 domU on CentOS 5.4 2.6.18-164.6.1.el5xen fails to boot
by Charles J Gruener 06 Mar '10

06 Mar '10

Doing a kickstart install of Fedora 12 results in a non-bootable image. >From a virt-maanger instance, the error produced when trying to run the domU is: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 498, in run_domain vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 573, in startup self.vm.create() File "/usr/lib64/python2.4/site-packages/libvirt.py", line 287, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: Boot loader didn't return any data!") If you drop to the command line to see what pygrub gets back, you get: # pygrub /var/lib/xen/images/fedora12.img Traceback (most recent call last): File "/usr/bin/pygrub", line 677, in ? fs = fsimage.open(file, get_fs_offset(file)) IOError: [Errno 95] Operation not supported The kickstart worked perfectly in Fedora 11 on a CentOS 5.4 dom0. I've tried investigating all sorts of grub options and even tried copying kernel and initramfs files out from the domU to dom0 and booting from those with no luck. The only thing that does work is if I install Fedora 11 and then perform an upgrade to Fedora 12. I really don't want to have to deploy machines this way. Is anyone else experiencing this issue? I can provide any further information requested. Basically, to repeat my error, install CentOS 5.4 with Virtualization, then try to install a Fedora 12 domU. The installation finishes without error but you can't boot. The systems are all x86_64. Thanks. Charles

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Is Ubuntu guest optimized or do I need to install para-virtual drivers manually?
by Neil Aggarwal 31 Dec '09

31 Dec '09

Hello: According to this list of supported guest on RHEL 5.4 KVM: <http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Virtuali zation_Guide/chap-Virtualization-KVM_Restrictions_and_support.html> http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Virtualiz ation_Guide/chap-Virtualization-KVM_Restrictions_and_support.html RHEL and some Windows guests are automatically optimized with para-virtualized drivers when I install it. Is the same true if I install Ubunto as a guest or is there something I need to do to get the para-virtual drivers installed on it? Thanks, Neil -- Neil Aggarwal, (281)846-8957, <http://UnmeteredVPS.net> http://UnmeteredVPS.net Host Joomla!, Wordpress, phpBB, or vBulletin for $25/mo Unmetered bandwidth = no overage charges, 7 day free trial

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kvm windows 7 attempts: amd 2, intel 0
by Mr. X 28 Dec '09

28 Dec '09

Hello, To explore kvm installs via Virt-Manager, I tried win7 installs in 3 different hosts. All 3 have 2G of RAM or more. Windows 7 Ultimate in 2.5 GB DVD ISO 1) Centos 5.4, AMD am2, Athlon 64 x2 4600+ works 2nd attempt after setup of Br0 (bridged network) virt-manager-0.6.1-8.el5 kvm-83-105.el5_4.13 2) OpenSuSE 11.2, AMD am2, Athlon 64 x2 5200+ works with defaults (Br0 is setup on OS install) virt-manager 0.8.0-5 kvm-0.11.0-4.5 3) Centos 5.4, Intel LGA 775 C2D, E7600 3.0 Ghz fails in shelled kvm and Virt-Manager with Br0 the Intel C2D box works so well - cooler and faster then the other two - but somehow the kvm intel support seems flawed. The win7 install gets past 2 boots and issues a VM exception in vcpu0 right after the third boot. Maybe someone else succeeded with a similar Intel setup. -- Mark /etc/libvirt/qemu/ ------------- win7kvm.xml ------------- <domain type='kvm'> <name>win7kvm</name> <uuid>d9113860-4731-4622-bc2e-54b656e1567a</uuid> <memory>1048576</memory> <currentMemory>1048576</currentMemory> <vcpu>2</vcpu> <os> <type arch='i686' machine='pc'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> </features> <clock offset='localtime'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu'/> <source file='/data2/kvm/win7.img'/> <target dev='hda' bus='ide'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu'/> <source file='/data2/kvm/WIN7_Ultimate_EN_DVD.iso'/> <target dev='hdc' bus='ide'/> <readonly/> </disk> <interface type='bridge'> <mac address='54:52:00:36:a2:59'/> <source bridge='br0'/> <model type='rtl8139'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/> </devices> </domain> ----------- unsnip -----------------

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Re: [CentOS-virt] About doing backups with kvm guests
by ml＠johestephan.de 16 Dec '09

16 Dec '09

Hi all, just to add some ideas to lvm snapshots. As far as I know ist there no need to dd the hole disk. It should fit if you just make the lvm snap ant mount it to any device you want. So you could pack the hole img and store it via bacula or something else. And you normally dont need to shut down the system. The snapshot tooks a bit longer but should even do it while the system is in use. So just: - take the snap - mount it - pack it Dont hit me if i am not right :-) Greetz Jörg

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Shutdown windows-vm hangs
by Ingmar 16 Dec '09

16 Dec '09

Hello I have a problem with CentOS 5.4, kvm and libvirt. Although my VM with Windows Server 2k3 supports ACPI the shutdown of the VM does not work. Once a user is logged on, Windows sends an application popup ("Other people logged on ...") and wait for user-action. The shutdown hangs up and the VM's will be terminated hard. Does anyone know a way to resolve this problem? Regards

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Libvirt problem - centos 5.4 / xen 3.4.2 all x86_64
by For＠ll 16 Dec '09

16 Dec '09

Hi, Anyone have that problem xen installation? [root@xen64-dev ~]# virsh autostart appl error: Failed to mark domain appl as autostarted error: internal error sexpr2string failed root@xen64-dev opt]# rpm -qa |grep libvirt libvirt-client-0.7.0-6.el5 libvirt-python-0.7.0-6.el5 libvirt-0.7.0-6.el5 [root@xen64-dev opt]# rpm -qa |grep xen xen-libs-3.4.2-2.el5 kernel-xen-2.6.18-164.6.1.el5 xen-3.4.2-2.el5 For@ll P.S Maybe newer version libvirt 0.7.4 is working fine? It's exist any repo where I find libvirt-0.7.4 for centos 5.4 ?

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KVM, network bridge with 2 NIC environment
by rewing 14 Dec '09

14 Dec '09

My server have 2 network Interface Cards (NIC). I just found if I create br0 and add both eth0 and eth1 to br0, I'll get errors: eth1: received packet with own address as source address. .. eth0: received packet with own address as source address. I still don't figure out how to set ifcfg-br0 and ifcfg-eth* to make guest os as a server just like host server in the LAN. can anybody post example for this 3 scripts?

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Re: [CentOS-virt] About doing backups with kvm guests
by Christopher G. Stach II 13 Dec '09

13 Dec '09

----- "carlopmart" <carlopmart(a)gmail.com> wrote: > which is the best form to backup and restore these windows guests? > Some examples? Shadow copy and amanda/zmanda. > I see snapshot's lvm option, but I think that this option it is not > valid for > windows guests... It's valid if you don't need a clean backup. :) Usually, a dump of a snapshot is good enough if it is read-mostly. It's probably better than nothing, although not recommended since there are no guarantees. > probably I need to use dd?? But if i use dd, how can > I restore lvm > image onto another host with lvm partitions? dd -- Christopher G. Stach II http://ldsys.net/~cgs/

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Re: [CentOS-virt] KVM: bridge configuration for static IP address
by rewing 12 Dec '09

12 Dec '09

>To: Discussion about the virtualization on CentOS ><centos-virt(a)centos.org> Message-ID: ><448255702.63.1260531144350.JavaMail.root(a)mail.chi.ldsys.net> >Content-Type: text/plain; charset=utf-8 >----- "rewing" <rewing(a)howfortune.com> wrote: >> I need to allocate public IP address to two guest os. >> > >I have only 2 network card Interface on server. say eth0 and eth1. > > > >I set eth1 a public IP address. so it should in >> >> # vi /etc/sysconfig/ifcfg-eth1 > > > >DEVICE=eth1 > >BOOTPROTO=static > >HWADDR=00:1a:4d:83:ad:00 > >BROADCAST=202.127.29.0 > >IPADDR=202.127.29.5 > >NETMASK=255.255.255.0 > >NETWORK=202.127.29.0 > >ONBOOT=yes > >TYPE=Ethernet > > > >Question 1: do I have to add GATEWAY=202.127.29.1 to above setting? >GATEWAY probably belongs in /etc/sysconfig/network... >> Question 2: do I need to add the rest 2 IP addresses in br0? >Nope. >> or I >> should keep br0 with no IP address and set IP in guest OS directly? >Yep. However, if you do that, you will need something acting as the gateway. If your host is going to be the gateway, it will need an address set in ifcfg->br0 and packet forwarding turned on. If eth1 and br0 are both in the same [public] network, you should just set the public IP address on br0 and add both eth0 and eth1 to the bridge and turn on STP. >(I don't see why you need eth0 in this mix at all if you are just using it for guests on the local machine.) >-- >Christopher G. Stach II >http://ldsys.net/~cgs/ Hi,Christopher, Thanks, But still I'm a little confused. Actually I don't need host to be a gateway. There're should be gate way's on that IDC center. So the gate way should be add to /etc/sysconfig/network, right? And still, I have 2 ehtnet interface on my mainboard. So I should allocate eth1 an IP address for host, and only make eth0 as br0, and set guest OS IP address in guest OS network configuration, right? Please help to check if this is the correct setting as bellow /etc/sysconfig/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static HWADDR=00:1a:4d:83:ad:00 BROADCAST=202.127.29.0 IPADDR=202.127.29.5 NETMASK=255.255.255.0 NETWORK=202.127.29.0 ONBOOT=yes TYPE=Ethernet /etc/sysconfig/ifcfg-eth0 DEVICE=eth0 HWADDR=00:1a:4d:83:ad:50 ONBOOT=yes BRIDGE=br0 /etc/sysconfig/ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=none ONBOOT=yes DELAY=0 will this work so host os and 2 guest oses all got their IP address? or I should modify something?

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Re: [CentOS-virt] KVM: bridge configuration for static IP address-latest
by rewing 12 Dec '09

12 Dec '09

>To: Discussion about the virtualization on CentOS ><centos-virt(a)centos.org> Message-ID: ><448255702.63.1260531144350.JavaMail.root(a)mail.chi.ldsys.net> >Content-Type: text/plain; charset=utf-8 >----- "rewing" <rewing(a)howfortune.com> wrote: >> I need to allocate public IP address to two guest os. >> > >I have only 2 network card Interface on server. say eth0 and eth1. > > > >I set eth1 a public IP address. so it should in >> >> # vi /etc/sysconfig/ifcfg-eth1 > > > >DEVICE=eth1 > >BOOTPROTO=static > >HWADDR=00:1a:4d:83:ad:00 > >BROADCAST=202.127.29.0 > >IPADDR=202.127.29.5 > >NETMASK=255.255.255.0 > >NETWORK=202.127.29.0 > >ONBOOT=yes > >TYPE=Ethernet > > > >Question 1: do I have to add GATEWAY=202.127.29.1 to above setting? >GATEWAY probably belongs in /etc/sysconfig/network... >> Question 2: do I need to add the rest 2 IP addresses in br0? >Nope. >> or I >> should keep br0 with no IP address and set IP in guest OS directly? >Yep. However, if you do that, you will need something acting as the gateway. If your host is going to be the gateway, it will need an address set in ifcfg->br0 and packet forwarding turned on. If eth1 and br0 are both in the same [public] network, you should just set the public IP address on br0 and add both eth0 and eth1 to the bridge and turn on STP. >(I don't see why you need eth0 in this mix at all if you are just using it for guests on the local machine.) >-- >Christopher G. Stach II >http://ldsys.net/~cgs/ Hi,Christopher, Thanks, But still I'm a little confused. Actually I don't need host to be a gateway. There're should be gate way's on that IDC center. So the gate way should be add to /etc/sysconfig/network, right? And still, I have 2 ehtnet interface on my mainboard. So I should allocate eth1 an IP address for host, and only make eth0 as br0, and set guest OS IP address in guest OS network configuration, right? Please help to check if this is the correct setting as bellow /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static HWADDR=00:1a:4d:83:ad:00 BROADCAST=202.127.29.0 IPADDR=202.127.29.5 NETMASK=255.255.255.0 NETWORK=202.127.29.0 ONBOOT=yes TYPE=Ethernet /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=00:1a:4d:83:ad:50 ONBOOT=yes BRIDGE=br0 /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=none ONBOOT=yes DELAY=0 will this work so host os and 2 guest oses all got their IP address? or I should modify something? I just try the above setting and it wont work!! It seems that I only need Ethernet interface and set br0 as host IP address ,and guest OS have their own IP address. But I have 2 Ethnet Interface, it seems deappreciate netbroadband if I couldn't use one for host and the other for guest? or I have to add more IP address for eth1?

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KVM: bridge configuration for static IP address
by rewing 11 Dec '09

11 Dec '09

I need to allocate public IP address to two guest os. I have only 2 network card Interface on server. say eth0 and eth1. I set eth1 a public IP address. so it should in # vi /etc/sysconfig/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static HWADDR=00:1a:4d:83:ad:00 BROADCAST=202.127.29.0 IPADDR=202.127.29.5 NETMASK=255.255.255.0 NETWORK=202.127.29.0 ONBOOT=yes TYPE=Ethernet Question 1: do I have to add GATEWAY=202.127.29.1 to above setting? now continue to set eth0,seems I would use it as bridge ,so ifcfg-eth0 would be: # vi ifcfg-eth0 DEVICE=eth0 HWADDR=00:1a:4d:83:ad:50 ONBOOT=yes BRIDGE=br0 There's no IP address in this ifcfg-eth0. so Question 2: do I need to add the rest 2 IP addresses in br0? or I should keep br0 with no IP address and set IP in guest OS directly? Could anybody tell me how to set br0 to let host os and 2 guest os all have their own dedicated IP address?

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About doing backups with kvm guests
by carlopmart 11 Dec '09

11 Dec '09

Hi all, I have two centos 5.4 servers that I use to run several windows kvm guests (10). All works ok (more or less) but I have a problem with backups. These windows guests are configured to use lvm partitions as a virtual disks. My problem is when I need to do guests backups. which is the best form to backup and restore these windows guests? Some examples? I see snapshot's lvm option, but I think that this option it is not valid for windows guests... probably I need to use dd?? But if i use dd, how can I restore lvm image onto another host with lvm partitions? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Re: [CentOS-virt] Bridge configuration on Xen 3.2+
by Christopher G. Stach II 10 Dec '09

10 Dec '09

----- "Yukio Yamaishi" <yukio.yamaishi(a)gmail.com> wrote: > Hi All, > > I'm using xen 3.0 on CentOS 5 with VLAN. > > #vconfig add eth0 100 > #/etc/xen/script/network-bridge start vifnum=1 netdev=eth0 > bridge=xenbr0.100 > > I know that after xen 3.2 the procedure of bridge configuration is > changed. > What is the correct command to set bridge interface to vlan? Add the VLAN interface to a bridge just for that VLAN traffic and then use that bridge for your guests. -- Christopher G. Stach II http://ldsys.net/~cgs/

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Bridge configuration on Xen 3.2+
by Yukio Yamaishi 10 Dec '09

10 Dec '09

Hi All, I'm using xen 3.0 on CentOS 5 with VLAN. #vconfig add eth0 100 #/etc/xen/script/network-bridge start vifnum=1 netdev=eth0 bridge=xenbr0.100 I know that after xen 3.2 the procedure of bridge configuration is changed. What is the correct command to set bridge interface to vlan? Yukio

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KVM network bridge setting on centOS
by rewing 09 Dec '09

09 Dec '09

I have a server that will be hosted in IDC. The Server have 2 network interface card. I would like to set one for host os itself. and the other network interface card as bridge for guest OS. Because I have 3 IP address that will allocate to host os and guest os. The host OS will be centos 5.4. I need ideas about how to set host OS's network. Could anybody post a workable network seting for me? because the Centos Wiki page seems out of date about this part. and also I googling a lot, but most instruction in the internet seems out of date too. B.R. Rewing

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KVM guest on a specific disk
by rewing 09 Dec '09

09 Dec '09

I'm deploying my KVM virtualization and I have this question. To get my guest os best performance I would like to install my OS from CD ROM while booting in a saperate disk, say /dev/sda4 then in host os I mount /dev/sda4 as /mnt/vm. So I can install a guest OS by virt-install with synax --import, right? I didn't give it a try yet so I'd like to know if other people have done it successfully. Will this let guest os best performance because it has its own disk rather than just a image file? and will it ocuppy the host running resources less? Rewing

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Re: [CentOS-virt] virt-install failed while install windows2003 guest
by rewing 09 Dec '09

09 Dec '09

Hi,All I've solve this problem by doing a chcon --reference=/var/lib/libvirt/images /vm this solve selinux block kvm from accessing disk image outside of /var/lib/libvirt/images Thanks 2009-12-09 rewing 发件人： centos-virt-request 发送时间： 2009-12-09 00:57:19 收件人： centos-virt 抄送：主题： CentOS-virt Digest, Vol 28, Issue 9 Send CentOS-virt mailing list submissions to centos-virt(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-virt or, via email, send a message with subject or body 'help' to centos-virt-request(a)centos.org You can reach the person managing the list at centos-virt-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-virt digest..." Today's Topics: 1. virt-install failed while install windows2003 guest (rewing) 2. Re: virt-install failed while install windows2003 guest (Markus Falb) 3. Re: virt-install failed while install windows2003 guest (Tait Clarridge) ---------------------------------------------------------------------- Message: 1 Date: Tue, 8 Dec 2009 16:58:56 +0800 From: "rewing" <rewing(a)howfortune.com> Subject: [CentOS-virt] virt-install failed while install windows2003 guest To: "centos-virt" <centos-virt(a)centos.org> Message-ID: <200912081658540620074(a)howfortune.com> Content-Type: text/plain; charset="us-ascii" Here's the procedure: # qemu-img -f qcow2 /vm/win2k3.img 8G # virt-install --connect qemu:///system -n win2k3 -r 512 --vcpus=1 -c /home/temp/win2003sp2ins.iso -f /vm/win2k3.img -s 4 --network=bridge:br0 --mac=00:ff:ff:ff:58:58 --noautoconsole --vnc --os-type=windows --os-variant=win2k3 --hvm --accelerate And I get error as below: Starting install... internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Domain installation may not have been successful. If it was, you can restart your domain by running 'virsh start win2k3'; otherwise, please restart your installation. ERROR internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Traceback (most recent call last): File "/usr/sbin/virt-install", line 861, in ? main() File "/usr/sbin/virt-install", line 759, in main start_time, guest.start_install) File "/usr/sbin/virt-install", line 814, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img any idea? 2009-12-08 rewing -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.centos.org/pipermail/centos-virt/attachments/20091208/55c24500… ------------------------------ Message: 2 Date: Tue, 8 Dec 2009 12:41:34 +0100 From: Markus Falb <markus.falb(a)fasel.at> Subject: Re: [CentOS-virt] virt-install failed while install windows2003 guest To: Discussion about the virtualization on CentOS <centos-virt(a)centos.org> Message-ID: <7FEF197D-7025-4E95-87DB-72AE50CEFA3E(a)fasel.at> Content-Type: text/plain; charset="us-ascii" On 8 Dec 2009, at 09:58, rewing wrote: > libvirtError: internal error unable to start guest: qemu: could not > open disk image /vm/win2k3.img Do you have selinux enabled ? As far as I know the location for images is restricted to /var/lib/libvirt/images by default. -- Markus -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.centos.org/pipermail/centos-virt/attachments/20091208/ac8640d6… ------------------------------ Message: 3 Date: Tue, 08 Dec 2009 09:11:02 -0500 From: Tait Clarridge <tait(a)clarridge.ca> Subject: Re: [CentOS-virt] virt-install failed while install windows2003 guest To: Discussion about the virtualization on CentOS <centos-virt(a)centos.org> Message-ID: <1260281462.2495.1.camel(a)taiterltp.int.interactivemedia.com> Content-Type: text/plain; charset="utf-8" On Tue, 2009-12-08 at 12:41 +0100, Markus Falb wrote: > > On 8 Dec 2009, at 09:58, rewing wrote: > > libvirtError: internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img > > > Do you have selinux enabled ? As far as I know the location for images > is restricted to /var/lib/libvirt/images by default. > > -- Or does the actual disk image exist at /vm/win2k3.img with r/w access to whoever is running the virt-install command? Does the /vm directory exist and does the user have permissions to access it? -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part Url : http://lists.centos.org/pipermail/centos-virt/attachments/20091208/79487930… ------------------------------ _______________________________________________ CentOS-virt mailing list CentOS-virt(a)centos.org http://lists.centos.org/mailman/listinfo/centos-virt End of CentOS-virt Digest, Vol 28, Issue 9 ******************************************

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virt-install failed while install windows2003 guest
by rewing 08 Dec '09

08 Dec '09

Here's the procedure: # qemu-img -f qcow2 /vm/win2k3.img 8G # virt-install --connect qemu:///system -n win2k3 -r 512 --vcpus=1 -c /home/temp/win2003sp2ins.iso -f /vm/win2k3.img -s 4 --network=bridge:br0 --mac=00:ff:ff:ff:58:58 --noautoconsole --vnc --os-type=windows --os-variant=win2k3 --hvm --accelerate And I get error as below: Starting install... internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Domain installation may not have been successful. If it was, you can restart your domain by running 'virsh start win2k3'; otherwise, please restart your installation. ERROR internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Traceback (most recent call last): File "/usr/sbin/virt-install", line 861, in ? main() File "/usr/sbin/virt-install", line 759, in main start_time, guest.start_install) File "/usr/sbin/virt-install", line 814, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img any idea? 2009-12-08 rewing

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S3 (Suspend to Disk) with XEN
by Yukio Yamaishi 07 Dec '09

07 Dec '09

Hi All, I have a 5.4 box and testing xen 3.4 on kernel-xen-2.6.18-164.6.1.el5. As you know, there are no enough configuration to do "Suspend to Disk" of the .config of the kernel-xen-2.6.18-164.6.1.el5. # Power management options (ACPI, APM) # CONFIG_PM=y Then, I tied to get the kernel-2.6.18-164.6.1.el5.src.rpm, installed that. #pwd /usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i686 #cp configs/kernel-2.6.18-i686-xen.config .config #make menuconfig Power management options (ACPI, APM) ---> ACPI (Advanced Configuration and Power Interface) Support ---> │ │ │ │ CPU Frequency scaling ---> │ │ There are no menu which likes "Legacy Power Management API". How can I add the options to enable the Supend to Disk? Yukio

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Re: [CentOS-virt] Slightly OT: FakeRaid or Software Raid
by Christopher G. Stach II 04 Dec '09

04 Dec '09

----- "Grant McWilliams" <grantmasterflash(a)gmail.com> wrote: > On Wed, Dec 2, 2009 at 9:48 PM, Christopher G. Stach II < > cgs(a)ldsys.net > wrote: > > ----- "Grant McWilliams" < grantmasterflash(a)gmail.com > wrote: > > > a RAID 10 (or 0+1) will never reach the write... performance of > > a RAID-5. > > (*cough* If you keep the number of disks constant or the amount of > usable space? "Things working" tends to trump CapEx, despite the > associated pain, so I will go with "amount of usable space.") > > No. > > -- > Christopher G. Stach II > > Nice quality reading. I like theories as much as the next person but > I'm wondering if the Toms Hardware guys are on crack or you disapprove > of their testing methods. > > http://www.tomshardware.com/reviews/external-raid-storage,1922-9.html They used a constant number of disks to compare two different hardware implementations, not to compare RAID 5 vs. RAID 10. They got the expected ~50% improvement from the extra stripe segment in RAID 5 with a serial access pattern. Unfortunately, that's neither real world use nor the typical way you would fulfill requirements. If you read ahead to the following pages, you have a nice comparison of random access patterns and RAID 10 coming out ahead (with one less stripe segment and a lot less risk): http://www.tomshardware.com/reviews/external-raid-storage,1922-11.html http://www.tomshardware.com/reviews/external-raid-storage,1922-12.html -- Christopher G. Stach II

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Re: [CentOS-virt] Slightly OT: FakeRaid or Software Raid
by Christopher G. Stach II 03 Dec '09

03 Dec '09

----- "Ben M." <centos(a)rivint.com> wrote: > I have had great luck with nvidia fakeraid on RAID1, but I see there > are > preferences for software raid. I have very little hands on with full > Linux software RAID and that was about 14 years ago. MD RAID. I'd even opt for MD RAID over a lot of hardware implementations. This writeup summarizes a bit of why: http://jeremy.zawodny.com/blog/archives/008696.html Hardware RAID's performance is obviously going to be better, but it's only worth it if you *need* it (more than ~8 disks, parity). If you're just doing RAID 0, 1, or 10 in a single box and you're not pushing it to its limits as a DB server or benchmarking and going over it with a magnifying glass, you probably won't notice a difference in performance. I'll take fewer moving parts and portability. As someone already said, dmraid is done in software, too. "Fakeraid" is basically the same as MD RAID, but with an extra piece of hardware and extra logic bits to fail. -- Christopher G. Stach II

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Re: [CentOS-virt] Slightly OT: FakeRaid or Software Raid
by Christopher G. Stach II 03 Dec '09

03 Dec '09

----- "Grant McWilliams" <grantmasterflash(a)gmail.com> wrote: > RAID 5 is faster than RAID 10 for reads and writes. *Serial* reads and writes. That is not the access pattern that you will have in most virtualization hosts. > What wasn't in the test (but is in others that they've done) is RAID > 6. I'm not sure I'm sold on it because it gives us about the same > level of redundancy as RAID 10 but with less performance than RAID 5. > Theoretically it would get soundly trounced by RAID 10 on IOs and > maybe be slower on r/w transfer as well. RAID 6 is pretty slow, but you can stripe them as RAID 60. If you need that kind of fault tolerance, the performance hit is negligible. On high volume boxes with low performance requirements, say NLS on an 8-12 bay 2U or 3U machine, I use RAID 6 with one hot spare. -- Christopher G. Stach II

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Re: [CentOS-virt] Slightly OT: FakeRaid or Software Raid
by Christopher G. Stach II 03 Dec '09

03 Dec '09

----- "Grant McWilliams" <grantmasterflash(a)gmail.com> wrote: > Interesting thoughts on raid5 although I doubt many would agree. That's okay. We all have our off days... Here's some quality reading: http://blogs.sun.com/bonwick/entry/raid_z http://www.cyberciti.biz/tips/raid5-vs-raid-10-safety-performance.html http://www.miracleas.com/BAARF/RAID5_versus_RAID10.txt http://www.miracleas.com/BAARF/1.Millsap2000.01.03-RAID5.pdf http://www.codinghorror.com/blog/archives/001233.html http://web.ivy.net/carton/rant/ml/raid-raid5writehole-0.html Maybe you are thinking of RAID 6. > I don't see how the drive type has ANYTHING to do with the RAID > level. IOPS, bit error ratio, bus speed, and spindle speed tend to factor in and are usually governed by the drive type. (The BER is very important for how often you can expect the data elves come out and chew on your data during RAID 5 rebuilds.) You will use those numbers to calculate the number of stripe segments, controllers, and disks. Combine that with the controller's local bus, number of necessary controllers, host bus, budget, and other business requirements and you have a RAID type. > a RAID 10 (or 0+1) will never reach the write... performance of > a RAID-5. (*cough* If you keep the number of disks constant or the amount of usable space? "Things working" tends to trump CapEx, despite the associated pain, so I will go with "amount of usable space.") No. -- Christopher G. Stach II

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Re: [CentOS-virt] Slightly OT: FakeRaid or Software Raid
by Christopher G. Stach II 02 Dec '09

02 Dec '09

----- "Grant McWilliams" <grantmasterflash(a)gmail.com> wrote: > He had a two drive RAID 1 drives and at least one of them failed but > he didn't have any notification software set up to let him know that > it had failed. And since that's the case he didn't know if both drives > had failed or not. I wonder why he things software RAID would be a) > more reliable b) fix itself magically without telling him. He never > did say if he was able to use the second disk. I have 75 machines with > 3ware controllers and on the very rare occasion that a controller > fails you plug in another one and boot up. I have a pile of various RAID controllers from 3ware, Promise, LSI, the utter garbage that older PERCs were, etc. that have pissed me off by randomly dropping disks, not rebuilding or detecting its own disks, hanging, etc. and very importantly, not allowing me to move disks between machines. That being said, I still have two 3ware cards and some LSI that are fine, but most of my arrays are software. Anecdotal evidence aside, unless you know what kind of performance you need, you have usage metrics, and you know how to benchmark properly, you probably don't need the risk and marginal performance improvement of some extra hardware. (This was originally about fakeraid, wasn't it?) > I don't use software RAID in any sort of production environment unless > it's RAID 0 and I don't care about the data at all. I've also tested > the speed between Hardware and Software RAID 5 and no matter how many > CPUs you throw at it the hardware will win. I don't allow RAID 5, so the increased checksum processing performance doesn't have any bearing on my choices. :) > Even in the case when a > 3ware RAID controller only has one drive plugged in it will beat a > single drive plugged into the motherboard if applications are > requesting dissimilar data. One stream from an MD0 RAID 0 will be as > fast as one stream from a Hardware RAID 0. Multiple streams of > dissimilar data will be much faster on the Hardware RAID controller > due to controller caching. True. That probably falls under be the aforementioned "need". :) You can't beat the performance of a cache, although the Linux filesystem cache will perform reasonably well. If you're using something like an ACID compliant DB, you'll want the battery backed hardware cache for any sizable amount of I/O. Discussing performance without discussing benchmark methodology is annoying and often useless, but if you want to go down that route... (Also, your use case is contrary to your storage design. You would use RAID 0 for serial access and something parallel for random access. Yes, a Ford Explorer doesn't hug corners at 120 mph.) -- Christopher G. Stach II

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KVM Support for Windows Server 2003 32 bit ready for production?
by Neil Aggarwal 02 Dec '09

02 Dec '09

Hello: I am wondering if KVM is ready for production for running a Windows Server 2003 32 bit guest. According to the RHEL 5.4 virtualization guide, there is supposed to be a virtio-win yum package, but that was not released. Instead, it looks like that is only available for RHN subscribers. Also, I saw this posting on the CentOS list: --- Quoted from CL Martinez There are freely redistributable, but still they aren't published by upstream. You can use these instead: http://www.linux-kvm.com/content/windows-binary-virtio-drivers-finally-relea sed, but there are a lot of problems with any windows 64 bits. And another problem, a big really, is that you can¡t install a windows kvm guest directly to a virtio disk. First you need to install to an ide disk, after generate a virtio disk and attach to win guest, install the virtio driver and last remove ide drive ... very very ugly. ---- End Quote That seems to imply things are still not ready for production use. Any opinions? Thanks, Neil -- Neil Aggarwal, (281)846-8957, http://UnmeteredVPS.net CentOS 5.4 VPS with unmetered bandwidth only $25/month! No overage charges, 7 day free trial, Google Checkout accepted

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