src/patches/suse-2.6.27.25/patches.fixes/scsi-retry-alua-transition-in-progress

   1 From: Rajashekhar M A <rajs@netapp.com>
   2 Subject: I/O errors for ALUA state transitions
   3 References: bnc#491289
   4
   5 When a SLES11 host is configured with a few LUNs and IO is running,
   6 injecting FC faults repeatedly leads to path recovery problems.
   7 The LUNs have 4 paths each and 3 of them come back active after
   8 say an FC fault which makes two of the paths go down, instead of
   9 all 4. This happens after several iterations of continuous FC faults.
  10
  11 Reason here is that we're returning an I/O error whenever we're
  12 encountering sense code 06/04/0a (LOGICAL UNIT NOT ACCESSIBLE,
  13 ASYMMETRIC ACCESS STATE TRANSITION) instead of retrying.
  14
  15 Signed-off-by: Hannes Reinecke <hare@suse.de>
  16
  17 ---
  18  drivers/scsi/scsi_error.c |    3 ++-
  19  1 file changed, 2 insertions(+), 1 deletion(-)
  20
  21 --- a/drivers/scsi/scsi_error.c
  22 +++ b/drivers/scsi/scsi_error.c
  23 @@ -383,7 +383,8 @@ static int scsi_check_sense(struct scsi_
  24                  * if the device is in the process of becoming ready, we
  25                  * should retry.
  26                  */
  27 -               if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01))
  28 +               if ((sshdr.asc == 0x04) &&
  29 +                   (sshdr.ascq == 0x01 || sshdr.ascq == 0x0a))
  30                         return NEEDS_RETRY;
  31                 /*
  32                  * if the device is not started, we need to wake