Configuring MPIO for the virtual AIX client

Virtual SCSI Server Adapter and Virtual Target Device.
The mkvdev command will error out if the same name for both is used.

$ mkvdev -vdev hdiskpower0 -vadapter vhost0 -dev hdiskpower0
Method error (/usr/lib/methods/define -g -d):
0514-013 Logical name is required.

The reserve attribute is named differently for an EMC device than the attribute
for ESS or FasTt storage device. It is “reserve_lock”.

Run the following command as padmin for checking the value of the attribute.
$ lsdev -dev hdiskpower# -attr reserve_lock

Run the following command as padmin for changing the value of the attribute.
$ chdev -dev hdiskpower# -attr reserve_lock=no

•Commands to change the Fibre Channel Adapter attributes And also change the following attributes of the fscsi#, fc_err_recov to “fast_fail” and dyntrk to “yes”

$ chdev -dev fscsi# -attr fc_err_recov=fast_fail dyntrk=yes –perm

The reason for changing the fc_err_recov to “fast_fail” is that if the Fibre
Channel adapter driver detects a link event such as a lost link between a storage
device and a switch, then any new I/O or future retries of the failed I/Os will be
failed immediately by the adapter until the adapter driver detects that the device
has rejoined the fabric. The default setting for this attribute is 'delayed_fail’.
Setting the dyntrk attribute to “yes” makes AIX tolerate cabling changes in the
SAN.

The VIOS needs to be rebooted for fscsi# attributes to take effect.

Reference: http://santosh-aix.blogspot.com