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
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
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 on
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
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
Ralph Angenendt wrote:
Julian Price wrote:
Hi Ralph
Thanks for setting up the page.
http://wiki.centos.org/HowTos/BackupKVMGuest
I have written a first draft and I will improve it over the coming days.
But is it going in the right direction?
I'm going to take a look at it later
Scott Robbins wrote:
As the original author of the KVM article, I'm quite happy with someone
taking it over and updating it. I fear that VirtualBox has become so
covenient, I haven't used KVM in months and months, so can't really
continue to properly maintain the article with changes that
Ralph Angenendt wrote:
You can either use absolute links [:/HowTos/KVM this is a link] or
relative links [:KVM this is a link]. See the syntax reference to make
sure, this is off top of my head and I might be wrong.
Ralph
That's what you'd think, but it's the other way around
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,
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
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) break
,
Julian
Ralph Angenendt wrote:
Ralph Angenendt wrote:
Thanks,
Julian Price
I'll do so after you tell me if JulianPrice is your wiki account =:D
Okay, done. And: Can we keep discussion on list on not fall back to private
mails? Thanks.
Ralph
points from this forum post...
http://www.centos.org/modules/newbb/viewtopic.php?topic_id=19034forum=38
Thanks,
Julian Price
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