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

[Syed Mushtaq <syed1.mushtaq@xxxxxxxxx>]

Thanks Roger. Will do that.

-Syed

On Fri, Apr 1, 2016 at 12:38 PM, Roger Pau Monné <roger.pau@xxxxxxxxxx> wrote:

On Fri, 1 Apr 2016, 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.

It doesn't seem like this is related to Xen, so I would recommend that you
ask in the linux-lvm [0] mailing list. TBH, I have no idea how well LVM
scales in these kind of scenarios.

Roger.

[0] https://www.redhat.com/mailman/listinfo/linux-lvm

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