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1608 discussions

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

02 Dec '09

----- "Ben M." <centos(a)rivint.com> wrote: > Thanks. The portability bonus is a big one. Just two other questions I > think. > > - Raid1 entirely in dom0? That's how I do it. dom0 should be handling the supply of the hardware services, and if dom0 has all of the drivers and physical disks under its control, it counts. dom0 should be able to handle the block scheduling better. Now, if booting guests with iSCSI disks and all the LUNs are on a SAN or otherwise networked and not directly under dom0 control, I would handle it differently. Besides, you don't want the added complexity of managing all of the LVs and extra guest configuration. > - Will RE type HDs be bad or good in this circumstance? I buy RE types > but have recently become aware of the possibility where TLER > (Time-Limited Error Recovery) can be an issue when run outside of a > Raid, e.g. alone on desktop machine. Definitely good as long as you have more than one disk in it. :) You want your disk to time out instead of holding up the array. You usually can't go wrong with NCQ and TLER. NCQ won't get you much in RAID 1, though. You can turn it off with the driver in most cases. -- Christopher G. Stach II

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Slightly OT: FakeRaid or Software Raid
by Ben M. 02 Dec '09

02 Dec '09

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. I am trying to determine which to use on a rebuild in a "standard" CentOS/Xen enviroment. It seems to me that while FakeRaid is/can be completely taken care of in dom0 dmraid whereas with software raid there *might* be an option to pass that role off more granularly to the domUs and not performed by dom0 at all. I have a small number of tiny domUs that rarely change (like an OpenVPN) that are well handled just by backups and firewall based failover and don't need RAID1. Is there any feedback on where the performance and availability tweak is here?

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Live migration and DRBD
by Gilberto Nunes 02 Dec '09

02 Dec '09

Hi folks I deploy a two Dell PowerEdge T300 to test Virtualization with kvm+drbd+heartbaet. The KVM drbd and heartbeat work properly. However, I have doubt!! When the primary node has down, the secondary node start the VM that has original running on primary node... So, this required a full stop of hole system... This is not we wish here... Is there something way to live migrate VM from primary node that was shutdown???? I have no idea how to make this stuff working... Thanks for any help -- Gilberto Nunes

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Has anyone gotten Fedora 12 running as a Xen guest?
by Scot P. Floess 01 Dec '09

01 Dec '09

I am running CentOS 5.4 (both i386 and x86_64 - different physical machines)... I've been able to get Fedora 11 running as a Xen guest - no trouble. However, I have had no luck with Fedora 12. My kickstart file lists /boot as ext3 - but for whatever reason Fedora 12 insists on making /boot ext4. I do have a bare metal machine running Fedora 12, so I thought "let me try to put together a kickstart file denoting /boot as ext3." I ran system-config-kickstart and about the only difference I saw in syntax was --fstype="ext3" versus what I was doing which is --fstype ext3 So, I changed my kickstart file to reflect --fstype="ext3" - the result is still the same: Fedora 12 insists /boot be ext4. As a result, when I run xm create <fedora vm name>, it fails stating "Error creating domain: Boot loader didn't return any data!" Please note, this is the same kickstart file I use to install CentOS 5.4 (and in the past 5.3) guests - as well as Fedora 11 guests. Has anyone managed to get Fedora 12 running as a Xen guest??? Scot P. Floess 27 Lake Royale Louisburg, NC 27549 252-478-8087 (Home) 919-890-8117 (Work) Chief Architect JPlate http://sourceforge.net/projects/jplate Chief Architect JavaPIM http://sourceforge.net/projects/javapim Architect Keros http://sourceforge.net/projects/keros

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Re: [CentOS-virt] Fedora 12 2.6.31.5-127.fc12 domU on CentOS 5.4 2.6.18-164.6.1.el5xen fails to boot
by Christopher G. Stach II 01 Dec '09

01 Dec '09

----- "Scot P. Floess" <sfloess(a)nc.rr.com> wrote: > It sure does...I am running it now... This has affected F8, F10, 5.3, and so on for a few years. I wouldn't count on it ever working unless you dig up the patches and figure out how to apply them yourself, or find someone who has. :) If you want, you can dig up all of the issues in Red Hat's bugzilla. Here's a recent one that may help you out: https://bugzilla.redhat.com/show_bug.cgi?id=528053 -- Christopher G. Stach II

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Re: [CentOS-virt] Controlling allocation of ethernet devices and KVM
by Christopher G. Stach II 30 Nov '09

30 Nov '09

----- "Steven Ellis" <steven.ellis(a)bulletin.net> wrote: > My issue is I can't see any way to bring up NAT guests unless they are > using a ethernet interface that has a address for the host OS. How will you NAT without an interface address to translate to? You can probably wrangle the scripts into supporting your own configured mangle/NAT setup with something handling the ARP for you on the unnumbered interface, but that's probably beyond the scope of this list. -- Christopher G. Stach II

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Controlling allocation of ethernet devices and KVM
by Steven Ellis 30 Nov '09

30 Nov '09

Running Centos 5.4 with KVM on a Dell R610 server and I'd like to control which of the four ethernet interfaces are used for specific tasks My ideal configuration would be eth0 - Host traffic only, no virtual guests. Used for guest mirroring and management. eth1 - NAT guest traffic only, no address for local machine and in some environments in the same zone as eth0 eth2/3 - Allocated to two different bridge devices which might be in separate network zones. The configuration of eth2/3 is fairly simple, my issue is restricting any NAT traffic to a specific ethernet devices, and ideally one with no local IP. Any ideas? Steve -- *Steven Ellis - Director of Worldwide Engineering,* *Bulletin.Net Inc* - http://www.bulletin.net/

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What kernel source and how to download it
by Mauro Gatti 27 Nov '09

27 Nov '09

Hi all, I am running CentOS 5.3 under xen on a VPS machine (so I have a limited control on the machine) I am playing with openswan and KLIPS and I need to build the ipsec.ko kernel module. I would need to download kernel source but I am really confused about what source I have to get. uname -r tells: 2.6.18-128.7.1.el5xen ls /lib/modules tells: ls /lib/modules 2.6.18-128.7.1.el5xen 2.6.18-164.2.1.el5 2.6.18-164.6.1.el5 2.6.18-53.1.13.el5xen I have no sources in /usr/src/kernels Is there a source code named "2.6.18-128.7.1.el5xen" which I can download or should I install kernel-devel source using yum? If I used yum I would download 2.6.30.9... yum info kernel-devel Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Available Packages Name : kernel-devel Arch : i686 Version : 2.6.18 Release : 164.6.1.el5 Size : 5.2 M Repo : updates Summary : Development package for building kernel modules to match the kernel. URL : http://www.kernel.org/ License : GPLv2 Description: This package provides kernel headers and makefiles sufficient to build modules : against the kernel package. and kernel.org has only source code from 2.6.18.1 to 2.6.18.8 Thanks Mauro

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Virsh shutdown all command?
by Neil Aggarwal 25 Nov '09

25 Nov '09

Hello: Is there a command in virsh to shutdown all domains? I can do one at a time, but that is untenable for a large number of domains. Thanks, Neil -- Neil Aggarwal, (281)846-8957, http://UnmeteredVPS.net CentOS 5.4 VPS with unmetered bandwidth only $25/month! 7 day no risk trial, Google Checkout accepted

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Shell command to list cpu usage for KVM guests?
by Neil Aggarwal 25 Nov '09

25 Nov '09

Hello: I am looking for a way to check CPU usage for KVM guests. I see that capability in virt-manager, but that would require me to install a GUI on the host. Is there a simple report from a command line tool? Something like the three load average numbers per guest in a list? I took a look at virsh but could not find anything. Thanks, Neil -- Neil Aggarwal, (281)846-8957, 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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