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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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