From owner-freebsd-scsi Thu Aug 31 22:12:52 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from mail-03-real.cdsnet.net (mail-03-real.cdsnet.net [204.118.244.93]) by hub.freebsd.org (Postfix) with SMTP id 9549137B424 for ; Thu, 31 Aug 2000 22:12:50 -0700 (PDT) Received: (qmail 36874 invoked from network); 1 Sep 2000 05:12:49 -0000 Received: from schizo.cdsnet.net (204.118.244.32) by mail-03-real.cdsnet.net with SMTP; 1 Sep 2000 05:12:49 -0000 Date: Thu, 31 Aug 2000 22:12:32 -0700 (PDT) From: Jaye Mathisen X-Sender: mrcpu@schizo.cdsnet.net To: John Lengeling Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: Different init speeds of raid5 plex subdisks under vinum In-Reply-To: <39A21314.1107B6AD@raccoon.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org I reported this when using ATA drives a couple months ago. It is trivially reproducible. I wasn't even using vinum, it can be reproduced with a script that starts up like 8 parallel newfs's on really big drives. The consensus was it was the scheduler, but nobody seemed to worried about it. On Tue, 22 Aug 2000, John Lengeling wrote: > I created a raid5 plex under vinum using 3 drives. These are supposed to be identical drives. They are slightly different in size. > > da2 at ahc0 bus 0 target 2 lun 0 > da2: Fixed Direct Access SCSI-3 device > da2: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled > da2: 17501MB (35843670 512 byte sectors: 255H 63S/T 2231C) > da1 at ahc0 bus 0 target 1 lun 0 > da1: Fixed Direct Access SCSI-3 device > da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled > da1: 17366MB (35566501 512 byte sectors: 255H 63S/T 2213C) > da3 at ahc0 bus 0 target 3 lun 0 > da3: Fixed Direct Access SCSI-3 device > da3: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled > da3: 17366MB (35566501 512 byte sectors: 255H 63S/T 2213C) > > 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? > > Or is this normal? > > johnl > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-scsi" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message