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Chapter 1: HP Clustered File System Commands 20

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

Now use the mxmpio command to change the path for psd2p1 to target 0:

# /opt/hpcfs/sbin/mxmpio active 0 psd2p1

To verify the change, run the mxmpio status -l command again. In the

following output, device psd2p1 is now active on target 0.

scsiN/C 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.

sdNsP A device node in /dev. The value is converted to a

major/minor number identifying the corresponding host

adapter.

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