Date: Fri, 08 Aug 1997 14:55:58 -0400 From: Peter S Galbraith <galbraith@mixing.qc.dfo.ca> To: aic7xxx@FreeBSD.ORG Cc: Peter S Galbraith <galbraith@mixing.qc.dfo.ca> Subject: Re: disk spin down <summary> Message-ID: <199708081855.OAA00261@mixing.qc.dfo.ca>
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[Bottom line: Can scsi-idle be used with swap?]
I wrote:
> I apologize if this isn't the proper forum. I don't know if this
> is handled by the SCSI driver or not. I use Linux pre-patch-2.0.31-3.
>
> I have a spare disk I use exclusively for nightly backups, and
> optionally seldom used swap. I'd like to spin down the disk when not
> in use (and unmounted) because of it's whinning sound.
Pierre Turlais told me about scsi-idle:
Title: scsi-idle - Turn off SCSI disks when idle (Take 2)
Description: A small kernel patch which spins down SCSI-disks after a
period of inactivity.
scsi-idle can probably be considered to be BETA software now,
it works for me and half dozen other people, but YMMV.
I patched the Linux kernel and tried the program when no partitions were
mounted. It worked but I got the following messages:
kernel: SCSI host 0 channel 0 reset (pid 4623) timed out - trying harder
kernel: SCSI bus is being reset for host 0 channel 0.
kernel: (scsi0:-1:0) Reset device, active_scb 1
kernel: scsi0: (targ -1/chan A) matching scb to (targ 1/chan A)
last message repeated 2 times
kernel: scsi0: Resetting current channel A
kernel: scsi0: Channel reset, sequencer restarted
kernel: (scsi0:1:0) Aborting scb 1
I assume all this is normal.
Then I enabled a swap partition on the spun-down SCSI disk and it spun-up
again to turn on swap. I told scsi-idle to spin down the disk after 5
minutes of inactivity. It spun down after 5 minute as I never swap much.
And I got these messages:
kernel: scsi : aborting command due to timeout : pid 5539, scsi0, channel 0, id 1, lun 0 Start/Stop Unit 00 00 00 00 00
kernel: general protection: 0000
kernel: CPU: 0
kernel: EIP: 0010:[<00000004>]
kernel: EFLAGS: 00010202
kernel: eax: 00000000 ebx: 002fd018 ecx: 001d8090 edx: 03b40003
kernel: esi: 00000297 edi: 00000000 ebp: 002f0018 esp: 001d5efc
kernel: ds: 0018 es: 0018 fs: 002b gs: 0000 ss: 0018
kernel: Process swapper (pid: 0, process nr: 0, stackpage=001d42e4)
kernel: Stack: 0019757f 002fd018 002fd018 002f0018 00000206 001d5f50 001960d0 002fd018
kernel: 00000003 002fd018 00197a36 002fd018 00040000 001fecc0 00000001 00112048
kernel: 00000001 ffffffff 00000001 00000001 001d5f6c 001feb30 00117907 001d5f6c
kernel: Call Trace: [scsi_abort+279/508] [scsi_times_out+72/304] [scsi_main_timeout+134/168] [timer_bh+248/820] [do_bottom_half+59/96] [handle_bottom_half+11/32] [schedule+436/648]
kernel: [exit_notify+219/468] [do_exit+487/492] [die_if_kernel+695/704]
kernel: Code: d0 9b 00 f0 c3 e2 00 f0 d0 9b 00 f0 d0 9b 00 f0 54 ff 00 f0
kernel: Aiee, killing interrupt handler
kernel: SCSI host 0 abort (pid 5539) timed out - resetting
kernel: SCSI bus is being reset for host 0 channel 0.
kernel: (scsi0:1:0) Abort_reset, scb flags 0x1, while idle, LASTPHASE = 0x1, SCSISIGI 0x0, SEQADDR 0x5, SSTAT0 0x5, SSTAT1 0xa
kernel: (scsi0:1:0) Queueing an Abort SCB.
kernel: (scsi0:1:0): Abort message sent.
kernel: SCSI host 0 channel 0 reset (pid 5539) timed out - trying harder
kernel: SCSI bus is being reset for host 0 channel 0.
kernel: (scsi0:-1:0) Reset device, active_scb 0
kernel: scsi0: (targ -1/chan A) matching scb to (targ 1/chan A)
last message repeated 2 times
kernel: scsi0: Resetting current channel A
kernel: scsi0: Channel reset, sequencer restarted
kernel: (scsi0:1:0) Aborting scb 0
Anything to worry about?
Or should I never enable a swap partition on a scsi-idle'd disk?
Thanks!
--
Peter Galbraith, research scientist <galbraith@mixing.qc.dfo.ca>
Maurice-Lamontagne Institute, Department of Fisheries and Oceans Canada
P.O. Box 1000, Mont-Joli Qc, G5H 3Z4 Canada 418-775-0852 - FAX 418-775-0546
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