A fix is available
APAR status
Closed as program error.
Error description
When using async GLVM, LVM metadata writes are given priority to write before the normal async writes, using a flag RPV_EXPRESS_IO_OP. In the case of large LVM metadata writes (which is common), this flag is not getting set, and LVM metadata writes are not given priority. Being held up behind async writes could potentially mean LVM config operations during heavy async glvm i/o take a long time, or GLVM I/O timeouts being seen for these metadata writes.
Local fix
Problem summary
When using async GLVM, LVM metadata writes are given priority to write before the normal async writes, using a flag RPV_EXPRESS_IO_OP. In the case of large LVM metadata writes (which is common), this flag is not getting set, and LVM metadata writes are not given priority. Being held up behind async writes could potentially mean LVM config operations during heavy async glvm i/o take a long time, or GLVM I/O timeouts being seen for these metadata writes.
Problem conclusion
Correct code to properly set the EXPRESS_IO flag for LVM metadata writes in async glvm vgs, in all paths.
Temporary fix
Comments
6100-07 - use AIX APAR IV54699 6100-08 - use AIX APAR IV58045 6100-09 - use AIX APAR IV54412 6100-09 - use AIX APAR IV54412 6100-09 - use AIX APAR IV54412 7100-01 - use AIX APAR IV57689 7100-02 - use AIX APAR IV53947 7100-03 - use AIX APAR IV54434 7100-04 - use AIX APAR IV54542
APAR Information
APAR number
IV54434
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-01-22
Closed date
2014-01-22
Last modified date
2016-05-10
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 V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U859005
UP14/05/22 I 1000
PTF to Fileset Mapping
U859005 bos.rte.lvm 7.1.3.15
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Document Information
Modified date:
10 May 2016