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
Manage 3PAR MPIO Device by SMIT
The 3PAR AIX MPIO device can be managed by smit mpio. There are three categories under the
smit mpio management:
• MPIO Path Management
• MPIO Device Management
• MPIO Parent Management
The common use for the Path Management is to enable the Failed status path. To enable the path,
select MPIO Path Management > Enable Paths > Enable Selected or All Paths.
The Device Management can be used to change the default device attributes setting. The following
are the default package settings for the 3PAR device:
Device Attribute Attribute Value Description
• reserve_policy no_reserve Does not apply a reservation methodology for the device.
• algorithm round_robin The default round_robin algorithm cannot use the
single_reserve policy. Any attempt to set in this
combination will fail.
• hcheck_interval 10 The health check interval is set to 10 seconds by default. It
is the interval value that the MPIO device driver would
send a SCSI command to the associated device. For
example, if one of the device paths is recovered from the
Failed state, the health check SCSI command will have a
good return code and enable the path automatically. To
disable this feature, change the
hcheck_interval value
to 0.
NOTE: Currently the AIX MPIO healthcheck function only
checks the paths being opened. It does not healthcheck
any path that is in the close state. The MPIO device driver
will change the path to the close state after I/O completes.
As a result, if a path fails during the I/O and does not
recover, the path will be put in the failed and close state
after the I/O completes. The healthcheck will not recover
the path in this case. However, the path can be manually
enabled by using
smit mpio. Select MPIO Path
Management > Enable Paths > Enable Selected or All
Paths.
• priority 1 All path priority is 1. It means that each path of the same
device has the same priority when using the round_robin
algorithm. It is the only priority value in this version.