Readme: 3PAR Multipath I/O 2.2 for IBM AIX (June 2013)

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320-1405-03 3PAR MPIO for IBM AIX November 2007
Understanding 3PAR Support for HACMP
You can run 3PAR MPIO 2.2 for IBM AIX in concurrent and non-concurrent multi-host environments.
The same LUNs on the 3PAR storage device can be attached to the AIX hosts managed by HACMP.
The 3PAR MPIO 2.2 can support HACMP version 5.3 running on pSeries servers with AIX 5.3 ML3.
Refer to the 3PAR Configuration Matrix and the 3PAR Best Practice documents for IBM AIX for
complete details on supported configurations.
3PAR MPIO 2.2 supports SCSI-3 persistent reserve attributes. It can be applied on each hdisk where
HACMP non-concurrent volume groups will be created. To check the persistent reserve key value
that HACMP will use, issue the command:
odmget -q "uniquetype=disk/fcp/3PAR_VV_MPIO AND attribute=PR_key_value" PdAt
The output should look similar to the following:
PdAt:
uniquetype = "disk/fcp/3PAR_VV_MPIO"
attribute = "PR_key_value"
deflt = "6075429844412053580"
values = ""
width = ""
type = "R"
generic = "DU"
rep = "s"
nls_index = 87
To enable the SCSI-3 persistent reserve on hdisk, issue:
‘chdev –l hdiskX –a reserve_policy=PR_exclusive’
where X is the device number such as hdisk3. You can also change the hdisk device Reservation
Policy to PR_exclusive through smit as described in the section, Manage 3PAR MPIO Device by
SMIT. If the HACMP non-concurrent volume groups reside on different hdisks, you need to change
the reserve_policy attribute to PR_exclusive on all these different hdisks. After completing
the reserve_policy attribute setting, the SCSI-3 persistent reserve will be applied on these hdisks
when HACMP vary on the non-concurrent volume groups.
NOTE: The 3PAR MPIO 2.2 for IBM AIX default reserve_policy is set to no_reserve. In
order to apply SCSI-3 persistent reserve on an HACMP non-concurrent volume group,
you must follow the steps described above to change the device reserve_policy
accordingly.
To disable the SCSI-3 persistent reserve, issue:
chdev –l hdiskX –a reserve_policy=no_reserve