Date: Thu, 31 Aug 2000 22:12:32 -0700 (PDT) From: Jaye Mathisen <mrcpu@internetcds.com> To: John Lengeling <johnl@raccoon.com> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: Different init speeds of raid5 plex subdisks under vinum Message-ID: <Pine.BSF.4.21.0008312211230.12837-100000@schizo.cdsnet.net> In-Reply-To: <39A21314.1107B6AD@raccoon.com>
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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: <IBM DNES-318350W SA30> 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: <IBM DNES-318350W SA60> 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: <IBM DNES-318350W SA60> 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
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