Date: Tue, 22 Aug 2000 00:43:48 -0500 From: John Lengeling <johnl@raccoon.com> To: freebsd-scsi@freebsd.org Subject: Different init speeds of raid5 plex subdisks under vinum Message-ID: <39A21314.1107B6AD@raccoon.com>
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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
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