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3.7.0 HP StorageWorks HP Scalable NAS File Serving Software command reference guide HP Scalable NAS for Linux (AG513-96003, October 2009)

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You can use the following command to specify either a particular HBA or a PSD
device. HP Scalable NAS will then fail over the I/O to the path that includes the
specified device. In the command, PSD-device is specified by the base name of
the device path, such as psd2p1 (not /dev/psd/psd2p1).
# mxmpio active <target> <psddev>
target can be one of the following values:
A numerical index on the PSD device target array (0..).I
A decimal major/minor number identifying the host adapter.M,m
A hexadecimal major/minor number identifying the host adapter.M:m
A scsi bus ID. N is the scsi host adapter ID (0..) and C is the scsi host
channel number (0..) as defined in /proc/scsi/scsi and /proc/
scsi/*/[0-9]. If C is omitted, zero is assumed.
scsiN/C
A device node in /dev. The value is converted to a major/minor number
identifying the corresponding host adapter.
sdNsP
With the exception of I (the array index), the value specified is converted to the
corresponding host adapter/channel before being used to select the target.
An example of changing the I/O path
In this example, we will change the target for a device. The mxmpio status -l
command identifies the path currently being used by each device. That path is labeled
“active.” The following output shows that device psd2p1 is active on target 1.
# /opt/hpcfs/sbin/mxmpio status -l
MPIO Failover is globally enabled
Failover Timeout Targets
psd1 enabled 30000 0. (41:50) scsi2/0/2/19 (active)
1. (08:90) scsi1/0/2/19
psd1p1 enabled 10000 0. (41:51) scsi2/0/2/19
1. (08:91) scsi1/0/2/19 (active)
psd1p2 enabled 30000 0. (41:52) scsi2/0/2/19 (active)
1. (08:92) scsi1/0/2/19
psd2 enabled 30000 0. (41:10) scsi2/0/1/20 (active)
1. (08:50) scsi1/0/1/20
psd2p1 enabled 10000 0. (41:11) scsi2/0/1/20
1. (08:51) scsi1/0/1/20 (active)
psd2p2 enabled 30000 0. (41:12) scsi2/0/1/20 (active)
1. (08:52) scsi1/0/1/20
HP Scalable NAS File Serving Software command reference guide 47