IT08406: SAN DEVICE DISCOVERY TRIGGERED BY TAPE OPERATIONS IN EXTERNAL LIBRARIES

6.3.6.000-TIV-TSMRPT-AGENT-Linux
6.3.6.000-TIV-TSMRPT-AGENT-AIX
6.3.6.000-TIV-TSMRPT-AIX
6.3.6.000-TIV-TSMRPT-AGENT-Windows
6.3.6.000-TIV-TSMRPT-Linuxx86
6.3.6.000-TIV-TSMRPT-Linuxx86_64
6.3.6.000-TIV-TSMRPT-WindowsI32
6.3.6.000-TIV-TSMRPT-WindowsX64
6.3.6.000-TIV-TSMAC-WindowsX64
6.3.6.000-TIV-TSMAC-WindowsI32
6.3.6.000-TIV-TSMAC-SolarisSPARC
6.3.6.000-TIV-TSMAC-Linuxx86
6.3.6.000-TIV-TSMAC-Linuxs390x
6.3.6.000-TIV-TSMAC-AIX
6.3.6.000-TIV-TSMALL-SolarisSPARC
6.3.6.000-TIV-TSMALL-WindowsX64
6.3.6.000-TIV-TSMSTA-WindowsI32
6.3.6.000-TIV-TSMALL-HP-UX
6.3.6.000-TIV-TSMALL-Linuxppc64
6.3.6.000-TIV-TSMALL-AIX
6.3.6.000-TIV-TSMALL-Linuxs390x
6.3.6.000-TIV-TSMALL-Linuxx86_64
IBM Tivoli Storage Manager V6.3 Fix Pack 6 (6.3.6.000) Server Downloads

APAR status

• Closed as duplicate of another APAR.

Error description

• Certain tape operations performed against an external library
  may result in SAN device discovery being triggered.  This
  behavior can occur when any of the following operations are
  performed against an external library:
  
     o tape dismounts
     o volume deletions
     o move drmedia (when a checkout occurs)
     o query drmedia
  
  When any combination of these events occur within a short amount
  of time this can result in the appearance of a hang condition as
  the NAV mutex is held by the NaDiscoverThread for the entire
  duration of the device discovery operation:
  
  
  
  
  
     Thread 33, Parent 1: NaDiscoverThread, Storage 162884,
     AllocCnt 414651 HighWaterAmt 214321
      tid=a21, ptid=1, det=1, zomb=0, join=0, result=0, sess=0
       Holding mutex NAV->mutex (0x1125a9ce8), acquired at
       nadiscvr.c(2311)
       Stack trace:
         0x090000000012d654 __fd_poll
         0x00000001003fe110 ReadResponseHeader
         0x0000000100400750 psSendScsiInquiry
         0x00000001003faeac GetIdentifyingData
         0x00000001003f94f8 GetAllAdrOnSan
         0x00000001003f21b4 DiscoverDevices
         0x00000001003f161c naDiscoverDevices
         0x00000001003f84c0 NaDiscoverThread
         0x000000010000cae0 StartThread
  
  Other operations waiting to acquire this mutex will have to wait
  until the device discovery operations have completed.
  
  Tivoli Storage Manager Versions Affected:
  All versions/platforms
  
  Initial Impact:
  Low
  
  Additional Keywords:
  edt gresham elm acsls discovery sandiscovery nadiscoverthread
  nav release
  

Local fix

• 1. Increase the value for the SANREFRESHTIME parameter to allow
     the SAN device information to be cached, thereby eliminating
     the need for device discovery operations to be performed as
     frequently
  2. Disable SANDISCOVERY, if necessary
  

Problem summary

Problem conclusion

Temporary fix

Comments

• This APAR is a duplicate of IT08768
  

APAR Information

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

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

Fix information

Applicable component levels