A fix is available
APAR status
Closed as program error.
Error description
A LUN on a DS3K, DS4K, or DS5K SAN is unmapped when running default AIX MPIO PCM. All the I/O for that LUN fails as expected. However; if the LUN is kept open, then it may attempt a failover causing I/O to other LUNs under the same Array to blocked while the failover is retrying. The failover will not succeed due to the LUN being unmapped, but I/O to other LUNs may be blocked for minutes.
Local fix
Problem summary
A LUN on a DS3K, DS4K, or DS5K SAN is unmapped when running default AIX MPIO PCM. All the I/O for that LUN fails as expected. However; if the LUN is kept open, then it may attempt a failover causing I/O to other LUNs under the same Array to blocked while the failover is retrying. The failover will not succeed due to the LUN being unmapped, but I/O to other LUNs may be blocked for minutes.
Problem conclusion
Do not allow failover to be attempted to LUN that has been unmapped (on the Storage).
Temporary fix
Comments
5300-10 - use AIX APAR IZ91236 5300-11 - use AIX APAR IZ90799 5300-12 - use AIX APAR IZ90848 6100-03 - use AIX APAR IZ87745 6100-04 - use AIX APAR IZ87767 6100-05 - use AIX APAR IZ87652 6100-06 - use AIX APAR IZ86778 7100-00 - use AIX APAR IZ86518
APAR Information
APAR number
IZ91236
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-12-18
Closed date
2010-12-18
Last modified date
2013-04-17
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
AIX 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U840558
UP11/02/23 I 1000
PTF to Fileset Mapping
U840558 devices.common.IBM.mpio.rte 5.3.10.4
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11P","label":"APARs - AIX 5.3 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"530","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
17 April 2013