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- From: olson@anchor.esd.sgi.com (Dave Olson)
- Newsgroups: comp.sys.sgi
- Subject: Re: SCSI Disk problems. [ drive spinup at poweron ]
- Message-ID: <nkoj2ak@zuni.esd.sgi.com>
- Date: 23 Jul 92 00:33:07 GMT
- References: <84086@netnews.upenn.edu> <nkf6r0o@zuni.esd.sgi.com> <14kho9INNccs@network.ucsd.edu>
- Sender: news@zuni.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- Lines: 28
-
- In <14kho9INNccs@network.ucsd.edu> sd@chem.ucsd.edu (Steve Dempsey) writes:
-
- | I just want to make sure I understand Dave Olson's recomendation
- | regarding the spin-up jumpers on SCSI disk drives. Do we want the
- | drives to spin up at power-on, or to wait until the start command is
- | received from the scsi controller? Do different models of the IRIS
- | have different preferences?
-
- All ESD systems (4D/20, 25, 30, 35, Indigo and r4k Indigo) want/need
- the motor start jumper(s) set (i.e., do not spin up until a
- startunit command is issued); all ASD systems except 4X0 and
- Crimson need to power up immediately because their PROMs don't
- know how to issue startunit.
-
- There are 2 reasons for delaying poweron. First, for internal
- drives, the power supply really can't handle spinning up multiple
- drives at the same time. Second, most drives will not respond
- to inquiry or other commands during power on spinup, and we
- expect drives to respond to inquiry within a few seconds of
- power on. Most of the ASD systems have no power on SCSI diags,
- other than the act of booting itself, and by the time they
- get up to the kernel, the drives have all spun up; the ESD
- systems, particularly from Indigo on, boot much more quickly
- up to the time when the rc scripts run.
- --
- Let no one tell me that silence gives consent, | Dave Olson
- because whoever is silent dissents. | Silicon Graphics, Inc.
- Maria Isabel Barreno | olson@sgi.com
-