Waiting 15 seconds for SCSI devices to settle *groan*
dillon at apollo.backplane.com
Thu Dec 1 14:03:12 PST 2005
:> antiquated SCSI peripherals that actually do need 15 seconds ;) ) If yes,
:> I'll just shut up about this.
:Well an old SGI Octane2 each with several (2 or 3) SGI "Vaults" (external SCSI drives)
:need definitely more than 15 seconds. "Antiquated"? Maybe. But I know
:of several (about 50) of such configurations in a productive environment.
:On the other hand I think you can lower the time to 5 seconds with "modern"
The big problem that we had in the 'early' days (circa 1995) was with
SCSI tape drives. I can well believe the SGI Vaults had a problem.
The problem isn't really device initialization time, its that old SCSI
devices often wouldn't even 'appear' on the SCSI bus until after a
lengthy initialization period. Modern devices appear on the SCSI bus
pretty much immediately and simply tell the host to hold on a minute
if queried before they are finished initializing themselves (spinning
up spindles, self-check, closing the CDROM tray, etc).
<dillon at xxxxxxxxxxxxx>
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