IC75518: BACKUP STGPOOL OF NAS TYPE DATA CAN CAUSE RESERVATION CONFLICT ON DRIVE

IBM Tivoli Storage Manager V5.5 Fix Pack 6 (5.5.6) Server Downloads

APAR status

• Closed as program error.

Error description

• If a Backup Stgpool (of NAS type data ONLY) is running during
  the same time period as another server process using volumes
  with NAS type data, the Backup Stgpool may have to wait for
  access to an input volume. While the process is waiting, the
  TCP/IP session to the NAS device will be idle. If the session is
  disconnected (due to a firewall timeout or other situation
  outside of Tivoli Storage Manager), the NAS device will hold a
  reservation on a drive in the library. Since the server is
  unable to remove this reservation (and we believe the filer will
  clean up the reservation on it's end), it will later attempt to
  access the drive and fail with an error similar to the
  following:
  
  ANR8844E Unable to open remote drive DRIVE1  (rst4a), error
  code=13
  Error code=13 is a Tivoli Storage Manager translation of NDMPrc
  2, which means DEVICE_BUSY
  

Local fix

• Reset the drives to release the reservation conflict. In order
  to prevent the problem:
  1) Do not run other NAS processes simultaneously with BACKUP
  STGPOOL.
  2) Increase the idle timeout for TCP/IP sessions on the firewall
  (or other device ending the sessions)
  3) Use the NO (Network Options) command on AIX in order to
  modify the TCP_KEEPIDLE option (to a value lower than the
  firewall timeout value)
  NOTE: This command will be slighty different on other operating
  systems
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Tivoli Storage Manager Server users of   *
  *                 NDMP backup                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: This fix enables TCP KEEP_ALIVE         *
  *                      packets on NDMP control connections.    *
  *                      However users with servers running      *
  *                      on Solaris, HP-UX or Linux must         *
  *                      set the "idle-time" interval at the     *
  *                      Operating system level. This value      *
  *                      should be less than any idle timeout    *
  *                      setting in a firewall between the       *
  *                      server and NAS device. For example      *
  *                      to set the idle time for KEEP_ALIVES    *
  *                      on Solaris to 15 minutes use the        *
  *                      following command:                      *
  *                        ndd -set                              *
  *                          /dev/tcp tcp_keepalive_interval     *
  *                           900000                             *
  *                      The number 900000 is the number of      *
  *                      milliseconds of idle time that          *
  *                      TCP/IP will wait before sending the     *
  *                      first KEEP_ALIVE packet.                *
  ****************************************************************
  * RECOMMENDATION:  Apply fixing level when available. This     *
  *                 problem is currently projected to be         *
  *                  fixed in levels 5.5.6, and 6.2.4.  *
  *                 Note  that this is subject to change at the  *
  *                 discretion of IBM.                           *
  ****************************************************************
  *
  

Problem conclusion

• Affected platforms: AIX, HP-UX, Solaris, Linux and Windows
  The TSM server now enables TCP KEEP_ALIVE packets on NDMP
  control connections to prevent firewalls from timing out
  these connections during periods of inactivity.
  

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:

Fix information

• Fixed component name

  TSM SERVER

• Fixed component ID

  5698ISMSV

Applicable component levels

• R55A PSY

     UP

• R55H PSY

     UP

• R55L PSY

     UP

• R55S PSY

     UP

• R55W PSY

     UP

• R61A PSY

     UP

• R61H PSY

     UP

• R61L PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R62A PSY

     UP

• R62H PSY

     UP

• R62L PSY

     UP

• R62S PSY

     UP

• R62W PSY

     UP