Subject: Re: XFS on RAID 10
From: Thomas Duffy <Thomas.Duffy.99@alumni.brown.edu>
To: Seth Mos <knuffie@xs4all.nl>
Cc: linux-xfs@oss.sgi.com
In-Reply-To: <1002857059.5390.11.camel@tduffy-lnx.afara.com>
In-Reply-To: <4.3.2.7.2.20011012073050.03147d38@pop.xs4all.nl>
References: <4.3.2.7.2.20011012073050.03147d38@pop.xs4all.nl>
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Date: 12 Oct 2001 12:34:55 -0700
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On Thu, 2001-10-11 at 22:34, Seth Mos wrote:
> At 20:24 11-10-2001 -0700, Thomas Duffy wrote:
> >I have setup a little (280G) xfs on RAID 10 (RAID 1 on RAID 0).  This
> >has 8 SCSI drives (4 per card).
> 
> Hardware, software or something in the middle?

all software

> >Everything seems to work fine, expect the RAID resync craaaawwwllllsss.
> >It goes at the minimum of 100k/s which should take a few months to
> >finish syncing :)  It sometimes bumps up to 250 k/s, but never higher
> >even with no system activity.
> 
> There is something about resyncing in the manpages of the raid tools IIRC.
> What kernel are you using, any special options and compiled with what compiler.
> IIRC there were some IO stalls fixed somewhere around 2.4.6.

2.4.11 now...will move up to 2.4.13-pre1 shortly...compiled with
redhat's 2.96-85 (i think I have the minor right here)...I know this is
not the "supported" compiler, but it seems to work fine.

> >First off, does anyone know of a way to bump the sync rate up?  Could
> >this be some sorta weirdness between XFS and MD that is causing the slow
> >resync?  On a simple RAID 1 setup (2 disks) w/ XFS on the device, the
> >resync is as speedy as the SCSI card allows when there is no other I/O
> >which is what I would expect from MD.
> 
> What version of md are you using and what scsi card is it.

they are adaptec scsi cards.  not sure what version of md...whatever is
in the 2.4.11 kernel.

-tduffy