Re: [Xen-devel] LVM performance problems with large number of VGs

[Syed Mushtaq <syed1.mushtaq@xxxxxxxxx>]

I understand that Xenserver has a different channel but I thought of mailing here as it would target a wider audience and I believe the problem that I am facing would also surface itself within upstream Xen as well as Xen also uses LVM as one of its storage options and the problem is very specific to LVM.

Thanks,

-Syed
 

On Fri, Apr 1, 2016 at 11:22 AM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:

On Fri, Apr 01, 2016 at 10:23:42AM -0400, Syed Mushtaq wrote:
> Hi,
>
> I am testing out a system in which each Guest disk is mapped to a LUN on a
> backend storage. I am using Xenserver 6.5 for this and creating an SR with
> a single VDI inside it for each Guest disk. The way it would work is, from
> an LVM point of view, I would have a Volume Group (VG) for each virtual
> disk and a single logical volume (LV) inside that VG. What I am seeing is
> that creating new volume groups is taking a lot of time. In my test after
> creating about 600 volume groups, it took about 4 seconds to create a new
> one. I have observed this to be a linear trend where the more VGs I add the
> slower future operations become. Other operations like getting the logical
> volumes inside a VG have also slowed down (even though there is only 1 LV
> per VG).
>
> I was wondering if anyone here faced a similar problem or had some
> experience in dealing with LVM bottlenecks.
>

Hi this mailing list is for upstream Xen development. For XenServer
related stuff please go to xenserver.org and look for correct channel
there.

Wei.

> Thanks,
> -Syed

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