IZ77535: CHANGING THE MAX_XFER_SIZE MAY FAIL ON AN ACTIVE HDISK APPLIES TO AIX 5300-09

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• when an MPIO device has 2 paths and each is using a
  different adapter and the disk is currently part of
  A VG that is varied on, if one adapter is placed in a
  defined state and the max_xfer_sized increased, and
  cfgmgr run to bring the adapter and path back online,
  cfgmgr may failed to add the path back into the
  MPIO device.
  
  The error may look similar to this one:
  
  [root@lpa-testdhts05:/] # cfgmgr
  Method error (/etc/methods/cfgscsidisk -l hdisk4 ):
          0514-040 Error initializing a device into the
  kernel.
  

Local fix

• change the max_xfer using the -P flag and reboot
  

Problem summary

• The disk max_tranfer size is increased above the size mentioned
  in the ODM, when the disk is open. Adding path would fail.
  

Problem conclusion

• The disk max_transfer size is not allowed to increase more
  than ODM's value, when the disk is open.
  

Temporary fix

Comments

• 5300-09 - use AIX APAR IZ77535
  5300-10 - use AIX APAR IZ82498
  5300-11 - use AIX APAR IZ82067
  5300-12 - use AIX APAR IZ81626
  6100-02 - use AIX APAR IZ80404
  6100-03 - use AIX APAR IZ80429
  6100-04 - use AIX APAR IZ80360
  6100-05 - use AIX APAR IZ80323
  6100-06 - use AIX APAR IZ80611
  6100-06 - use AIX APAR IZ80675
  6100-06 - use AIX APAR IZ80611
  7100-00 - use AIX APAR IZ84244
  

APAR Information

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

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

  IZ80323 IZ80360 IZ80404 IZ80429 IZ80611 IZ80675 IZ81626 IZ82067
  IZ82498 IZ84244

Fix information

• Fixed component name

  AIX 5.3

• Fixed component ID

  5765G0300

Applicable component levels

• R530 PSY U837737

     UP10/09/21 I 1000

PTF to Fileset Mapping

• U837737 devices.fcp.disk.rte 5.3.9.6