From owner-freebsd-scsi  Mon Aug 21 22:43:57 2000
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Date: Tue, 22 Aug 2000 00:43:48 -0500
From: John Lengeling <johnl@raccoon.com>
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Subject: Different init speeds of raid5 plex subdisks under vinum
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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


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