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

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.


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


> Thanks,
> -Syed

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