Date: Thu, 18 Jul 1996 21:43:27 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-scsi@freebsd.org Cc: y0002257@ws.rz.tu-bs.de (Sven Brandenburg) Subject: Re: turning off scsi disks Message-ID: <199607181943.VAA07196@uriah.heep.sax.de> In-Reply-To: <9607181717.AA79038@rzrtr1.rz.tu-bs.de> from Sven Brandenburg at "Jul 18, 96 07:17:48 pm"
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As Sven Brandenburg wrote: > I suppose turning off a scsi harddisk with the scsi(8) command and > START/STOPUNIT crashes the whole system rather than reducing noise > ;-) You can turn it off while it's not opened. The hooks for turning it on are already in place (they need to go a couple of lines above in order to work correctly). I'm actually doing this with my MO drive in the `od' driver, to avoid heat generation and laser and mechanics abration while it's not being mounted. Making it spin down while being idle would require additional timers in the driver, but should not be undoable. However, the hook to turn it on must be moved into the sdstart routine then (perhaps activated by some additonal flag in the sd_data structure that is being set by the timeout handler when spinning it down). -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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