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SubjectRe: exception Emask 0x0 SAct 0x1 / SErr 0x0 action 0x2 frozen


On Tue, 30 Sep 2008, Tom Mortensen wrote:

> Don't know if this is the original poster's problem, but if the drive
> is spun down, then enabling SMART or trying to read SMART attributes
> causes the drive to spin up and the command is delayed until this has
> occurred.
>
> The fix is to increase the timeout given to scsi_execute() in
> drivers/ata/libata-scsi.c.
>
> ie, current code (2.6.26.5) is:
>
> /* Good values for timeout and retries? Values below
> from scsi_ioctl_send_command() for default case... */
> cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
> sensebuf, (10*HZ), 5, 0);
>
> Should be changed to:
>
> /* Good values for timeout and retries? Values below
> from scsi_ioctl_send_command() for default case... */
> cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
> sensebuf, (30*HZ), 5, 0);
>
> Using a 1TB Hitachi hard drive, this command times out because it
> takes this drive about 15 seconds to spin up. Virtutally all hard
> drives spin up in less than 30 sec, but perhaps make this higher in
> case there are slower drives out there?
>
> Cheers,
> Tom

Velociraptor 10k drive here (2.6.26.5):

Sep 30 15:55:06 p34 kernel: [420781.333179] ata6.00: exception Emask 0x0 SAct
0x0 SErr 0x0 action 0x6 frozen
Sep 30 15:55:06 p34 kernel: [420781.333189] ata6.00: cmd
b0/d8:00:00:4f:c2/00:00:00:00:00/00 tag 0
Sep 30 15:55:06 p34 kernel: [420781.333190] res
40/00:ff:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Sep 30 15:55:06 p34 kernel: [420781.333194] ata6.00: status: { DRDY }
Sep 30 15:55:06 p34 kernel: [420781.333200] ata6: hard resetting link
Sep 30 15:55:06 p34 kernel: [420781.638589] ata6: SATA link up 3.0 Gbps (SStatus
123 SControl 300)
Sep 30 15:55:06 p34 kernel: [420781.662166] ata6.00: configured for UDMA/133
Sep 30 15:55:06 p34 kernel: [420781.669416] sd 5:0:0:0: [sdf] Write Protect is
off
Sep 30 15:55:06 p34 kernel: [420781.669416] sd 5:0:0:0: [sdf] Mode Sense: 00 3a
00 00
Sep 30 15:55:06 p34 kernel: [420781.669416] sd 5:0:0:0: [sdf] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Nothing wrong with the disk, it just happens... :( Linux/kernel bug?
It happens on multiple controllers, Intel, SiI, Marvell, does not seem to
matter.

SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA
_of_first_error
# 1 Short offline Completed without error 00% 2761 -
# 2 Short offline Completed without error 00% 2737 -
# 3 Extended offline Completed without error 00% 2714 -
# 4 Short offline Completed without error 00% 2689 -
# 5 Extended offline Completed without error 00% 2514 -
# 6 Short offline Completed without error 00% 2306 -
# 7 Short offline Completed without error 00% 2282 -
# 8 Short offline Completed without error 00% 2258 -
# 9 Short offline Completed without error 00% 2234 -
#10 Extended offline Completed without error 00% 2211 -
#11 Short offline Completed without error 00% 2186 -
#12 Short offline Completed without error 00% 2138 -
#13 Short offline Completed without error 00% 2114 -
#14 Short offline Completed without error 00% 2090 -
#15 Short offline Completed without error 00% 2066 -
#16 Extended offline Completed without error 00% 2043 -
#17 Short offline Completed without error 00% 2018 -
#18 Short offline Completed without error 00% 1970 -
#19 Short offline Completed without error 00% 1947 -
#20 Short offline Completed without error 00% 1923 -
#21 Short offline Completed without error 00% 1899 -


Justin.



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