Date: 17 Jan 2001 05:18:45 +0100 From: Cyrille Lefevre <clefevre@citeweb.net> To: "Kenneth D. Merry" <ken@kdm.org> Cc: clefevre@poboxes.com, freebsd-scsi@FreeBSD.ORG Subject: Re: SCSI suspend/resume Message-ID: <bst6olp6.fsf@gits.dyndns.org> In-Reply-To: "Kenneth D. Merry"'s message of "Fri, 12 Jan 2001 21:12:18 -0700" References: <d7dshzi1.fsf@gits.dyndns.org> <20010112211218.A32720@panzer.kdm.org>
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"Kenneth D. Merry" <ken@kdm.org> writes: sorry for the late answer, but I can't "spin down" my drives until now. > On Sat, Jan 13, 2001 at 05:01:10 +0100, Cyrille Lefevre wrote: > > Is there a way to suspend/resume SCSI devices as IDE devices does ? > > > > currently, if an SCSI device is manually suspended using camcontrol, > > it couldn't be automatically resumed except using camcontrol as well. > > The only thing I can figure you mean by "suspend" is "spin down". > > You can do that with camcontrol, like this: > > camcontrol stop da0 yes, I know that. > As soon as you try to access the drive, the SCSI subsystem will spin it > back up. You can also spin a drive up with camcontrol: > > camcontrol start da0 yes, but those thing cannot be made automatically by the kernel as this is done for IDE devices. > > while EDI devices maybe suspended/resumed through apm -z... > > EDI devices? What are those? typo, read IDE. what do I mean is... on zzz (apm -Z), IDE drives are slept and waiked u[ automatically by the kernel. and it seems there is no equivalent way to do this for SCSI devices. try the following sequence : # grep /disk[12] /etc/fstab /dev/ad0s1a /disk1 ufs rw 1 2 /dev/da1s1a /disk2 ufs rw 1 2 # df Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/da0s1a 1904559 1720449 31746 98% / /dev/ad0s1a 1904559 1655671 96524 94% /disk1 /dev/da1s1a 2031922 1872260 -2891 100% /disk2 (yes, I know, I'm almost full :) # umount /disk1 # umount /disk2 # zzz (you heard that disk1 is spinning down, but not disk2, so) # camcontrol stop da1 # mount /disk1 (no problem, disk1 is waiked up and mounted) # mount /disk2 (oops) Jan 17 05:01:57 <kern.crit> gits /kernel: (da1:sym0:0:4:0): . CDB: 8 0 0 0 1 0 Jan 17 05:01:57 <kern.crit> gits /kernel: (da1:sym0:0:4:0): NOT READY asc:4,2 Jan 17 05:01:57 <kern.crit> gits /kernel: (da1:sym0:0:4:0): field replaceable unit: 2 Jan 17 05:01:57 <kern.crit> gits /kernel: da1: reading primary partition table: error reading fsbn 0 Jan 17 05:09:40 <kern.crit> gits /kernel: (da1:sym0:0:4:0): . CDB: 8 0 0 0 1 0 # camcontrol stop da1 Unit started successfully # mount /disk2 (ok) do you understand what I mean ? PS : don't do that if you have any swap space on an SCSI drive or you're dead. Cyrille. -- home: mailto:clefevre@citeweb.net work: mailto:Cyrille.Lefevre@edf.fr To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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