Hi,
I would highly recommend AGAINST trying to run Xen DomUs on GlusterFS.
Firstly it is a file-system, you should really avoid running any production
virtual machines backing to a file - it is a world of pain you really
don''t
want to deal with.
Secondly GlusterFS just isn''t fit for a production workload of this
type at
this time, this isn''t so much a jab at GlusterFS as it is using a
screwdriver when you need a hammer.
GlusterFS is suited to large sequential file accesses, not completely
random IOPs intensive loads like virtual machines.
I have ran VMs on it to my own detriment and I will never do so again. I
encountered many strange issues especially when I started to mix striping
with replication over large numbers of servers to try achieve good random
IO performance.
In my experience this is a road many have tried to walk but have all walked
away from scarred in some shape or form.
If you really need a clustered solution there are approaches using Luster
VFS etc but the problem is that distributed storage solutions that are
production quality for running VMs are closely guarded secrets.
Your best bet for stability and ease of testing etc is DRBD replicated
iSCSI - not fancy but highly effective and will push the IOPs you need for
good VM performance if you invest in a few SSDs and a decent RAID
controller.
Joseph.
On 3 November 2011 12:23, Miles Fidelman <mfidelman@meetinghouse.net>
wrote:
> Florian,
>
>
> Florian Heigl wrote:
>
>> 2011/11/2 Miles
Fidelman<mfidelman@**meetinghouse.net<mfidelman@meetinghouse.net>
>> >:
>>
>>> Anybody running Xen on top of GlusterFS (or tried with a recent
version)?
>>> How well does it work?
>>>
>> I tried around 7 months ago.
>> The O_DIRECT problem did not go away, domUs would boot, but hang at
>> mountroot.
>>
>
> can you elaborate just a bit?
>
> and... do you remember which version of Gluster you were experimenting
> with?
>
>
>
>> Documentation was contradictive, but back then they had just hired a
>> professional tech writer to clean up things.
>>
>> I would recommend you give it a try, but I would also recommend you to
>> not keep trying and trying like I had.
>>
>
> Right. Thanks :-)
>
> Miles
>
>
>
>
> --
> In theory, there is no difference between theory and practice.
> In<fnord> practice, there is. .... Yogi Berra
>
>
>
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