IC35433: TSM ANR8355E - ERROR READING LABEL - LTO POWER CYCLE / POWER FAILURE

APAR status

• Closed as program error.

Error description

• If the customer has an LTO volume mounted and the drive is power
  cycled or there is an interuption in power to the drive it is
  possible for TSM to over write the volume label for the volume
  mounted in the drive at the time of the power interuption.
  The issue would result in the following error:
  ANR8355E I/O error reading label for volume LTOXXX in drive XYZ.
  ..
  When there is an interuption in power to an LTO drive the drive
  does not dismount the volume as the 3590 and 3570 drives do.
  INSTEAD the device loads the tape and becomes ready.
  ..
  IF TSM is tracking the mounted volume as an idle volume and
  reopens the drive it is possible the GETREPORTDENSITY will
  receive the sense data associated to the bus reset and TSM
  will ignore it and assume the reopen finished without errors.
  TSM then relies on internal code to track the location of the
  tape but because of the power interuption the tape rewinds
  and the actual position of the volume and TSM's internal
  position are not the same and this may lead to an over write.
  You can check a TSM trace for the following:
  ..
  PVR I/O agent (37) processing REOPEN request.
  Reopening NTP volume LTO054.
  Getting capacity of cartridge loaded in drive DRV3581 (/dev/rmt6
  Error performing GETREPORTDENSITY operation on drive
  DRV3581 (/dev/rmt6); errno = 5
  Drive DRV3581 (/dev/rmt6): sense=70.00.06.00.00.00.00.1C.00.00.0
  Found estimated capacity of 100000 for format 00000002
  Found compression ratio of 2 for format 00000002.
  NtpOpGetMaxBlockSize:rc=0 Volume LTO054 blocksize=262144,.......
  ..
  PVR I/O agent (37) finished REOPEN request; rc=0.
  THE REQUEST to reopen the drive responds with an RC=0.
  

Local fix

• For those customer's who do not have their drives connected to
  a UPS system and who have problems with their power source the
  MOUNTRetention to 0 to help reduce the exposure to this issue.
  Once a PTF is available for this issue apply the PTF and set the
  mountretention back to the desired value.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: TSM 4.2 and 5.1 users with IBM LTO, 3590, or *
  *                 3570 tape drives.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: Data can be overwritten if a tape       *
  *                      drive is reset while TSM has control    *
  *                      of the drive.                           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During certain commands issued after a tape has been IDLE TSM
  was ignoring unit attention errors being surfaced by the tape
  drive indicating that the tape is not longer positioned
  correctly.  This problem only exists with IBM LTO, 3590, and
  3570 tape drives on Windows, AIX, Linux, and Sun platforms.
  

Problem conclusion

• All unit attention errors are now handled correctly.  After the
  unit attention the tape will be re-positioned to the correct
  location.  This will prevent data from being overwritten.
  
  This fix is available in the 4.2.3.3 and 5.1.6.1 patches and
  above.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IC35562 IC35627

Fix information

• Fixed component name

  TSM SERVER 510

• Fixed component ID

  5698ISMSV

Applicable component levels

• R51A PSY

     UP

• R51L PSY

     UP

• R51S PSY

     UP

• R51W PSY

     UP

• R51Z PSY

     UP

• R51H PSN

     UP

• R51P PSN

     UP