From owner-freebsd-scsi  Mon Aug 21 22:50:19 2000
Delivered-To: freebsd-scsi@freebsd.org
Received: from verdi.nethelp.no (verdi.nethelp.no [158.36.41.162])
	by hub.freebsd.org (Postfix) with SMTP id 2709637B422
	for <freebsd-scsi@freebsd.org>; Mon, 21 Aug 2000 22:50:17 -0700 (PDT)
Received: (qmail 37077 invoked by uid 1001); 22 Aug 2000 05:50:11 +0000 (GMT)
To: johnl@raccoon.com
Cc: freebsd-scsi@freebsd.org
Subject: Re: Different init speeds of raid5 plex subdisks under vinum
From: sthaug@nethelp.no
In-Reply-To: Your message of "Tue, 22 Aug 2000 00:43:48 -0500"
References: <39A21314.1107B6AD@raccoon.com>
X-Mailer: Mew version 1.05+ on Emacs 19.34.2
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Date: Tue, 22 Aug 2000 07:50:11 +0200
Message-ID: <37075.966923411@verdi.nethelp.no>
Sender: owner-freebsd-scsi@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

> When I ran the vinum init command to initialize the plex, one of the
> drives da2 completed the initialization 3-4 times faster than da1
> and da3.  Something like 20 minutes for da2 versus 60 minutes for
> da1/da3.  Both da1 and da3 initialized at the same rate.  Is this
> weird?  Did da3/da1 get transfers negotiated down to slower speeds?
> Bad cabling?

I noticed a similar problem when initializing a 4-disk RAID5 array some
weeks ago. In my case I had two disks on ATA-66 controllers and two disks
on ATA-33 - and the ATA-66 connected disks initialized at roughly double
the rate of the ATA-33 connected disks. I simply assumed it was due to
difference between the ATA-66 and ATA-33 speeds.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-scsi" in the body of the message