From: "Leonard Smith" <lrsmith@gmail.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] LVM2 resync speed problems
Date: Wed, 13 Jun 2007 16:28:16 -0400 [thread overview]
Message-ID: <89f9efee0706131328r6db8c366u45f159de6d2aa9c9@mail.gmail.com> (raw)
In-Reply-To: <4670415C.7020808@mattgillen.net>
Forgot to mention, the drives are WD 500 GB "Raid enabled" SATA
drives. They are some of WD newer drives, and I think they are
techincally SATA2. The other system also has the same drives.
On 6/13/07, Matthew Gillen <me@mattgillen.net> wrote:
> Leonard Smith wrote:
> > I am running CentOS4.4 on two "black" box systems that are
> > identically configured. Both have 500 GB internal drives, ( same type)
> > and were installed using the same kickstart configuration. The drives
> > are being mirrored using LVM.
> >
> > When I check the first system it is re-syncing and the resync time and
> > speed are
> >
> > finish=18559.6min speed=355K/sec
> >
> > On the second system the time and speed are
> >
> > finish=89.5min speed=68170K/sec
> >
> > I can't figure out why the speeds are different between the two. I
> > checked /proc/sys/dev/raid/speed_limit_ and they are the same. The
> > priority of the md proceses are they same.
> >
> > I tweaked the setting of the speel_limit_min and increase the nice
> > priority of the resync process, on the first box, but I could never
> > get it better than
> >
> > finish=4551.8min speed=1445K/sec
> >
> >
> > I've googled and I haven't found much more useful information that to
> > adjust those settings. Besides those setting what else dictates the
> > speed used?
>
> You might compare the hd settings using 'hdparm'. I'm not sure factor of 100+
> can be explained by an incorrect DMA setting or something like that, but it
> might be a contributor.
>
> Matt
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
next prev parent reply other threads:[~2007-06-13 20:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-13 1:52 [linux-lvm] LVM2 resync speed problems Leonard Smith
2007-06-13 19:05 ` Leonard Smith
2007-06-13 19:11 ` Matthew Gillen
2007-06-13 20:28 ` Leonard Smith [this message]
2007-07-03 15:58 ` John Wang
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