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Re: [CentOS-virt] Bad Disk Performance of domU
by Christopher G. Stach II 20 May '09

20 May '09

----- "Francisco Pérez" <fperez.x(a)gmail.com> wrote: > OK, here it is: > > name = "vm01" > uuid = "2fa05fe5-9b52-3527-5bf5-efb88555c567" > maxmem = 5836 > memory = 5836 > vcpus = 1 > bootloader = "/usr/bin/pygrub" > on_poweroff = "destroy" > on_reboot = "restart" > on_crash = "restart" > vfb = [ ] > disk = [ "tap:aio:/var/lib/xen/images/vm01.img,xvda,w" ] > vif = [ "mac=00:16:3e:15:6f:cd,bridge=xenbr0" ] > > Thanks. What kind of "disk performance"? Read? Write? Random? Linear? As for general tuning, use block devices (LVM) unless you have to do otherwise. Do you do a large amount of I/O in general? Do you have dom0's CPU pinned to an unshared core? -- Christopher G. Stach II

2 1

Bad Disk Performance of domU
by Francisco Pérez 19 May '09

19 May '09

Hi list. Im Running xen on a brand new dell PE 1950 with 146 GB SAS Disk on raid1. The performance on the I/O on the domU is really poor, but in dom0 the performance is great. Any ideas? Regards Francisco.

2 4

Machine freeze
by Maros TIMKO 05 May '09

05 May '09

Hi all, we are running CentOS 5.2 Xen virtualization system with the latest CentOS packages with couple of VMs on DELL PowerEdge. "Sometimes" the whole machine freezes without anything in log files, anything on the console. "Sometimes" really means we cannot define why or when. Sometimes the machine was idle with just one VM, sometimes quite busy with couple of VMs.  Has anybody had the same experience? If yes, any hints on how to resolve it or how to trace the cause?   Thanks. 

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gentoo
by mattias 03 May '09

03 May '09

How to install gentoo with virt-install I not use full virtualization Only xen para or what the name are So i can't use virtual cd

1 0

Virt-install
by mattias 29 Apr '09

29 Apr '09

Exuse all my questiosn but i not find any info about virt-install on centos.org So how install e.g debian with virt-install with an iso?

3 5

xen
by mattias 28 Apr '09

28 Apr '09

Have anyone get a ubuntu guest worked in centos? I try now but only recive errors insmod: error inserting '/lib/scsi_mod.ko': -1 Operation not permitted Loading sd_mod.ko module ksign: module signed with unknown public key - signature keyid: 88a2b9299d40c296 ver=3 insmod: error inserting '/lib/sd_mod.ko': -1 Operation not permitted Loading libata.ko module ksign: module signed with unknown public key - signature keyid: 88a2b9299d40c296 ver=3 insmod: error inserting '/lib/libata.ko': -1 Operation not permitted Loading ata_piix.ko module ksign: module signed with unknown public key - signature keyid: 88a2b9299d40c296 ver=3 insmod: error inserting '/lib/ata_piix.ko': -1 Operation not permitted Loading dm-mod.ko module ksign: module signed with unknown public key - signature keyid: 88a2b9299d40c296 ver=3 insmod: error inserting '/lib/dm-mod.ko': -1 Operation not permitted Loading dm-log.ko module ksign: module signed with unknown public key - signature keyid: 88a2b9299d40c296 ver=3 insmod: error inserting '/lib/dm-log.ko': -1 Operation not permitted Loading dm-mirror.ko module I use kernel = "/boot/vmlinuz-2.6.18-128.el5xen" ramdisk = "/boot/initrd-2.6.18-128.1.6.el5xen" Any tip?

4 13

WinXP Xen guest: compare VNC vs RDP
by Ed Heron 27 Apr '09

27 Apr '09

I'm experimenting with using WinXP Xen guests as an alternative to upgrading workstations. The administrative advantages seem overwhelming. Please share thoughts about using VNC vs RDP for remote desktop connections. Please share any anecdotal information regarding user reactions and/or implementation issues.

7 17

Issues getting Xen NAT networking to work on CentOS 5.3
by Andrew Montgomery-Hurrell 27 Apr '09

27 Apr '09

I've got a virtual network setup going on where I have 3 VMs running on a host system which ran fine under CentOS 5.2 but under 5.3 everything to do with the networking has gone weird. I can't seem to access my VMs over the internal virtual network interfaces, setting their IPs statically in the VM conf files, for some reason the VIFs end up with an IP 127 higher, ie. 10.0.0.1 becomes 10.0.0.128. Ignoring that issue, the main one is that that IP, rather than connect to the running VM's network interface instead just connects to localhost on the host system. The only way I can access the VMs is with 'xm console' which obviously isn't very useful considering I need the VMs to host web content. The VMs can access the outside world and download things such as updates, etc, but the host system can't access them (obviously the outside world can't and this is intentional in this case as their interfaces aren't exposed externally). I've tried this with and without the firewall running and the issue persists, so it's definitely not iptables screwing things up. What's annoying is that my setup worked perfectly fine in 5.2 but in 5.3 it's been nothing but hassle to get working and I'm completely stumped with getting this networking issue sorted. Anyone have any ideas what might be causing the issue?

1 1

state of lfarkas KVM repository + Centos KVM wiki
by Rainer Traut 26 Apr '09

26 Apr '09

Hi all, I have followed the wiki howto to install KVM on my C5 server with a F10 x86_64 guest. Howto here: http://wiki.centos.org/HowTos/KVM With one small problem here: http://www.centos.org/modules/newbb/viewtopic.php?post_id=74275&topic_id=19… the guest is really running stable for one week now. Maybe someone could have a look at udev why it always sets permission for /dev/net/tun wrong and update the wiki? But my actual question is, what's the state of lfarkas repository? Can it be trusted? Sadly there is no frontpage on http://www.lfarkas.org/ Thx Rainer

5 11

lfarkas Repository + KVM on centos Wiki
by Rainer Traut 24 Apr '09

24 Apr '09

Dear all, I've succesfully installed a F10 x86_64 KVM guest on C5 x86_64 with the help of the wiki - running for 7 days now. :) Two questions; What's the state of the lfarkas's repository - can it be trusted - I guess yes but google did not help much. It's only mentioned in the kvm howto - not under the third party repos. And sadly http://www.lfarkas.org/ is empty. Second q. I still have problems with the tun device for users as mentioned here: http://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&topic_id=19… An help for this? THx Rainer

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