From: Wei Liu <wei.liu2@citrix.com>
To: Syed Mushtaq <syed1.mushtaq@gmail.com>
Cc: Wei Liu <wei.liu2@citrix.com>,
"Tutkowski, Mike" <Mike.Tutkowski@netapp.com>,
Will Stevens <wstevens@cloudops.com>,
Marc Vaillancourt <mvaillancourt@cloudops.com>,
Pierre-Luc Dion <pdion@cloudops.com>,
xen-devel@lists.xenproject.org,
Tim Mackey <Timothy.Mackey@citrix.com>
Subject: Re: LVM performance problems with large number of VGs
Date: Fri, 1 Apr 2016 16:22:10 +0100 [thread overview]
Message-ID: <20160401152210.GL27636@citrix.com> (raw)
In-Reply-To: <CADMzvUpzD6bz2hzF+Ji+cTUBhxAWKC2j9mJ32t9UQXGM3W4k4Q@mail.gmail.com>
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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
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next prev parent reply other threads:[~2016-04-01 15:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-01 14:23 LVM performance problems with large number of VGs Syed Mushtaq
2016-04-01 15:22 ` Wei Liu [this message]
2016-04-01 15:53 ` Syed Mushtaq
2016-04-01 16:38 ` Roger Pau Monné
2016-04-01 17:19 ` Syed Mushtaq
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