On a 32bit Windows 2008 Server guest VM on a CentOS 5 host, iometer
reported a disk write speed of 37MB/s
The same VM on a CentOS 6 host reported 0.3MB/s. i.e. The VM was unusable.
Write performance in a CentOS 6 VM was also much worse, but it was usable.
(See http://lists.centos.org/pipermail
>> physical disk position shouldn't have such a marked effect should it?
Nanook wrote:
> Actually the physical disk position can make a HUGE difference.
Thank you Nanook for your explanation. I think you're right. It looks
like the variation in performance is not due to LVM, but the position o
>> I have 2 similar servers. Since upgrading one from CentOS 5.5 to 6,
disk write performance in kvm guest VMs is much worse.
Philip Durbin wrote:
> Nice post, Julian. It generated some feedback at
http://irclog.perlgeek.de/crimsonfu/2012-08-10 and a link to
http://rhsummit.files.wordpress.co
> On 10.08.2012 13:46, Julian price wrote:
>
>> I have 2 similar servers. Since upgrading one from CentOS 5.5 to 6,
>> disk write performance in kvm guest VMs is much worse.
>> ...
>> Is this a known problem? If so, what's the cause?If not, is
>>
I have 2 similar servers. Since upgrading one from CentOS 5.5 to 6, disk
write performance in kvm guest VMs is much worse.
There are many, many posts about optimising kvm, many mentioning disk
performance in CentOS 5 vs 6. I've tried various changes to speed up
write performance, but northing
Rainer Traut wrote:
>
> 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/
>
Levente Farkas contributes on the centos-devel list and I have seen
several other posts from people using those RPMs so yes,
Ed Heron wrote:
> 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 re
Kai Schaetzl wrote:
> I'm not sure what you mean
>
I mean that I am backing up one 32GB virtual disk in one file called
vm.img or vm.qcow or vm.vhd depending on the virtual disk format.
The advantage is that
- we don't care which operating system is inside the virtual disk file
- We can us
Kai Schaetzl wrote:
> Another one, although I'm sure that some will loudly protest about it :-)
> I've had excellent results with rsyncing the complete content of Xen VMs
> to other Xen VMs. It works flawlessly even for MySQL database in full
> swing. Maybe it makes a difference if you use InnoDB
Rui Miguel Silva Seabra wrote:
On Wed, Mar 25, 2009 at 01:22:43PM +, Julian Price wrote:
It has not been released yet and it's a first draft, so break it to me
gently...
http://wiki.centos.org/HowTos/BackupKVMGuest
Interesting read. One other alternative, with drbd:
1)
Hello
This new HowTo explains how to backup a VM without powering it down.
It's specifically aimed at KVM although it may work with any
virtualization software that uses Linux as the host.
Please review it and let me know what you think, particularly if you are
already doing something similar
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