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Date:      Wed, 21 Apr 1999 17:02:12 -0700
From:      Darren Pilgrim <dpilgrim@uswest.net>
To:        Mark Ovens <marko@uk.radan.com>
Cc:        "Francis Percival C. Favoreal" <dune@cats.edu.ph>, Doug White <dwhite@resnet.uoregon.edu>, freebsd-questions@freebsd.org, freebsd-isp@freebsd.org
Subject:   Re: SCSI problem
Message-ID:  <371E6704.B6E8A560@uswest.net>
References:  <Pine.LNX.3.96.990421092534.18736A-100000@mayon.cats.edu.ph> <371D79EF.CA43A24B@uk.radan.com>

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Mark Ovens wrote:
<brevity snip>
> Just a thought but this couldn't be caused by (SCSI) BIOS settings
> could it? I only ask because I've just added a second SCSI HD to my
> system and it exhibits similar behaviour, although it never fails to
> start.
> 
> The original disk is an IBM Ultrastar 2ES U/W and that spins up as
> soon as the power is switched on but the new disk, IBM Ultrastar 9ES
> U/W, doesn't spin up until the SCSI controller probes it (I thought
> I'd forgotten to connect the power lead the first time I powered up
> after installing it).
> 
> The SCSI card is a Diamond Fireport (NCR/Symbios 53c875 chip). It
> seems strange that one disk spins up immediately and the other waits
> until it's probed, but since it always spins up and works without
> problems I've never bothered investigating further.

Some of the SCSI HBAs I have stage the spin-ups to avoid overloading
the power supply.  Perhaps this might be the cause?


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