New: Fail to issue Start/Stop Unit

https://bugzilla.kernel.org/show_bug.cgi?id=16070

           Summary: Fail to issue Start/Stop Unit
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 2.6.34-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
        AssignedTo: [email protected]
        ReportedBy: [email protected]
        Regression: No

I am attempting to save power by spinning down idle scsi disks. These are old fashioned parallel (U320) disks on a SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 07).

I do:

sg_start --stop /dev/sde
echo 0xfffffff > /sys/module/scsi_mod/parameters/scsi_logging_level dd if=/dev/sde of=/dev/null count=1
sleep 10
echo 0 > /sys/module/scsi_mod/parameters/scsi_logging_level

I get:
dd: reading `/dev/sde': Input/output error
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00536828 s, 0.0 kB/s

If I manually spin up the disk with sg_start --start /dev/sde, then things work again as expected.

The relevant log is as follows:

May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_open
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_init_command: block=0, count=32
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] block=0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] reading 32/32 512 byte blocks.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 20 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 16384, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 20 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 8000002)
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_done:
sb[respc,sk,asc,ascq]=70,2,4,2
May 28 23:55:13 fs kernel: 32 sectors total, 0 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Device not ready
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 20 00
May 28 23:55:13 fs kernel: end_request: I/O error, dev sde, sector 0
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 0
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 1
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 2
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 3
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_init_command: block=0, count=8
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] block=0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] reading 8/8 512 byte blocks.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 4096, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 8000002)
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_done:
sb[respc,sk,asc,ascq]=70,2,4,2
May 28 23:55:13 fs kernel: 8 sectors total, 0 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Device not ready
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: end_request: I/O error, dev sde, sector 0
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_release
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_open
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Inquiry: 12 00 00 00 fe 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 254, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Inquiry: 12 00 00 00 fe 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 0)
May 28 23:55:13 fs kernel: 0 sectors total, 254 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_release
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_open
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Inquiry: 12 01 00 00 fe 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 254, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Inquiry: 12 01 00 00 fe 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 0)
May 28 23:55:13 fs kernel: 0 sectors total, 254 bytes done.
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Inquiry: 12 01 80 00 fe 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 254, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Inquiry: 12 01 80 00 fe 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 0)
May 28 23:55:13 fs kernel: 0 sectors total, 254 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_release
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_open
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_init_command: block=0,
count=256
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] block=0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] reading 256/256 512 byte blocks.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 01 00 00
May 28 23:55:13 fs kernel: buffer = 0xf70faa00, bufflen = 131072, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 01 00 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 8000002)
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_done:
sb[respc,sk,asc,ascq]=70,2,4,2
May 28 23:55:13 fs kernel: 256 sectors total, 0 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Device not ready
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 01 00 00
May 28 23:55:13 fs kernel: end_request: I/O error, dev sde, sector 0
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 0
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 1
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 2
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 3
May 28 23:55:13 fs kernel: Buffer I/O error on device sde, logical block 4
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_init_command: block=0, count=8
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] block=0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] reading 8/8 512 byte blocks.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 4096, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 8000002)
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_done:
sb[respc,sk,asc,ascq]=70,2,4,2
May 28 23:55:13 fs kernel: 8 sectors total, 0 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Device not ready
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: end_request: I/O error, dev sde, sector 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_release
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_open
May 28 23:55:13 fs kernel: scsi_block_when_processing_errors: rtn: 1
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_init_command: block=0,
count=256
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] block=0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] reading 256/256 512 byte blocks.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 01 00 00
May 28 23:55:13 fs kernel: buffer = 0xf70faa00, bufflen = 131072, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 01 00 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 8000002)
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_done:
sb[respc,sk,asc,ascq]=70,2,4,2
May 28 23:55:13 fs kernel: 256 sectors total, 0 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Device not ready
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 01 00 00
May 28 23:55:13 fs kernel: end_request: I/O error, dev sde, sector 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_init_command: block=0, count=8
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] block=0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] reading 8/8 512 byte blocks.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Send: 0xe3772780 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: buffer = 0xe37726e0, bufflen = 4096, queuecommand
0xf81773c6
May 28 23:55:13 fs kernel: leaving scsi_dispatch_cmnd()
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Done: 0xe3772780 SUCCESS
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_OK
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] scsi host busy 1 failed 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: Notifying upper driver of completion
(result 8000002)
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_done:
sb[respc,sk,asc,ascq]=70,2,4,2
May 28 23:55:13 fs kernel: 8 sectors total, 0 bytes done.
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Device not ready
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Sense Key : Not Ready [current] 
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] Add. Sense: Logical unit not
ready, initializing command required
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00
00 00 08 00
May 28 23:55:13 fs kernel: end_request: I/O error, dev sde, sector 0
May 28 23:55:13 fs kernel: sd 6:0:0:0: [sde] sd_release
May 28 23:55:14 fs kernel: scsi_block_when_processing_errors: rtn: 1

After getting: "Add. Sense: Logical unit not ready, initializing command required" I would expect a Start/Stop unit command, but it appears that none is ever issued.

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<snip>

There is a different design philosophy between SCSI and ATA disks (and has been for a very long time) reflecting their different markets. When a SCSI disk is spun down, then it will return errors on any command trying to do IO until a SCSI START STOP UNIT command (start) is sent and then time is allowed for the disk to spin up.

What you report as a bug is the long standing behaviour of SCSI disks which Linux has not tried to modify.

Doug Gilbert

If you set the allow_restart sysfs parameter on the disk, it should automatically spin up the disk when scsi eh sees that sense data.

Thanks,

Brian

Brian King
Linux on Power Virtualization
IBM Linux Technology Center

https://bugzilla.kernel.org/show_bug.cgi?id=16070

--- Comment #1 from Anonymous Emailer <[email protected]> 2010-05-28 15:20:51 ---
Reply-To: [email protected]

<snip>

There is a different design philosophy between SCSI and ATA disks (and has been for a very long time) reflecting their different markets. When a SCSI disk is spun down, then it will return errors on any command trying to do IO until a SCSI START STOP UNIT command (start) is sent and then time is allowed for the disk to spin up.

What you report as a bug is the long standing behaviour of SCSI disks which Linux has not tried to modify.

Doug Gilbert

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https://bugzilla.kernel.org/show_bug.cgi?id=16070

--- Comment #2 from Anonymous Emailer <[email protected]> 2010-05-28 15:36:13 ---
Reply-To: [email protected]

If you set the allow_restart sysfs parameter on the disk, it should automatically
spin up the disk when scsi eh sees that sense data.

Thanks,

Brian

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https://bugzilla.kernel.org/show_bug.cgi?id=16070

--- Comment #3 from Ian Dall <[email protected]> 2010-05-29 00:57:56 --- Ah, thanks. That works perfectly!

I knew that traditionally this wasn't supported in linux (as per comment #1) but I also understood that the functionality had been added in recent kernels.

In my defence, I can't find any reference to this in "man sd' nor with "grep allow_restart Documentation/scsi/*".

Can this be treated as a documentation bug?

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Alan <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
                 CC|                            |[email protected]
         Resolution|                            |DOCUMENTED

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