On Fri, Sep 19, 2008 at 1:53 PM, Alberto Treviño <[EMAIL PROTECTED]> wrote:
> On Friday 19 September 2008 12:41:46 pm you wrote:
>> Are you using filesystem backed storage for the guest images or direct
>> block device storage? I assume there's heavy write activity on the
>> guests when these hangs happen?
>
> Yes, they happen when one VM is doing heavy writes. I'm actually using a
> whole stack of things:
>
> OCFS2 on DRBD (Primary-Primary) on LVM Volume (continuous) on LUKS-encrypted
> partition. Fun debugging that, heh?
a not-so-wild guess might be the inter-node locking needed by any
cluster FS. you'd do much better using just CLVM or EVMS-Ha
if it's a single box, it would be interesting to compare with ext3
> So, any ideas on how to solve the bottleneck? Isn't the CFQ scheduler
> supposed to grant every processes the same amount of I/O? Is there a way to
> change something in proc to avoid this situation?
i don't think CFQ can do much to alleviate the heavy lock-dependency
of a cluster FS
--
Javier
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