Date: Wed, 16 Sep 1998 20:16:27 -0700 From: Mike Smith <mike@smith.net.au> To: Matt Hamilton <matt@clintondale.com> Cc: current@FreeBSD.ORG Subject: Re: SCSI spindowns and CAM Message-ID: <199809170316.UAA02054@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 16 Sep 1998 22:35:42 EDT." <Pine.BSF.3.96.980916222947.9619B-100000@boris.clintondale.com>
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> Dear All, > I've been meaning to ask this for a while,a nd I wonder if now anything > has changed with CAM being introduced: Is it possible to spin down SCSI > disks when not in use? Somehow send them a STOP command after a certain > amount of inactivity? Or trigger it from APM or something? My old IDE > disks used to spin down after inactivity via a bios setting, and I seem to > remember FreeBSD had no problems with this. You could probably hack something up to do this; for the most part we tickle disks often enough that they tend to stay spun up regardless. > For the record my controller is an onboard AIC7880 and I'm running > -current with CAM (aout) > > Also I get this: > > da0 at ahc0 bus 0 target 1 lun 0 > da0: <IBM DFHSS2W 1717> Fixed Direct Access SCSI2 device > da0: 10.0MB/s transfers (10.0MHz, offset 15), Tagged Queueing Enabled > da0: 2150MB (4404489 512 byte sectors: 255H 63S/T 274C) > da1 at ahc0 bus 0 target 2 lun 0 > da1: <IBM DFHSS2W 4G4G> Fixed Direct Access SCSI2 device > da1: 10.0MB/s transfers (10.0MHz, offset 15), Tagged Queueing Enabled > da1: 2150MB (4404489 512 byte sectors: 255H 63S/T 274C) > > Both the drives are WIDE SCSI-II and I thought they are meant to run at > 20MB/s (I have 20Mb/s set in my Adaptec BIOS)? I haven't had them very > long and so I'm not sure if they were indeed running 20MB/s before CAM was > introduced. > > Any insight? Looks like you might have wide negotiation turned off in the Adaptec BIOS setup. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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