[Xen-bugs] [Bug 743] Unable to start more than a few domU's on RHEL4 amd64 (Error: Backend device not found)

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=743





------- Comment #21 from andrew.warfield@xxxxxxxxxxxx  2006-08-29 14:34 -------
Subject: Re:  Unable to start more than a few domU's on RHEL4 amd64 (Error:
Backend device not found)

Thanks for all your testing and feedback.  I've just pushed a fix that
reduces the aio context allocation by a factor of 8.  You should be
able to start 93 disks before having to up the system-wide allocation
limit.  I'll attach this patch in case you want to try it out
immediately, otherwise you'll have to wait for our build/release
process to test it.

a.

On 8/29/06, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
<bugzilla-daemon@xxxxxxxxxxxxxxxxxxx> wrote:
> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=743
>
>
>
>
>
> ------- Comment #20 from tejasvia@xxxxxxxxx  2006-08-29 14:18 -------
> Thanks Andrew. You were right.  I was wondering why it was failing in the 
> first
> check and missed the other code path that takes into account the current
> requests .. guess proper instrumentation would have helped :)
>
> I am able to start 35 VM's on a machine with 1GB RAM with 200MB for dom0 and
> 30MB for each domU.
>
> I will let this bug hang around unresolved until I scale this to 60 which is 
> my
> next step.
>
>
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