IBM DS8000 manual Determine the installed Sddpcm level, Useful Mpio commands

http://publib16.boulder.ibm.com/pseries/en_US/aixbman/admnconc/hotplug_mgmt.htm#mpioconcepts

The management of MPIO devices is described in the “Managing MPIO-Capable Devices” section of System Management Guide: Operating System and Devices for AIX 5L:

http://publib16.boulder.ibm.com/pseries/en_US/aixbman/baseadmn/manage_mpio.htm

Restriction: A point worth considering when deciding between SDD and MPIO is, that the IBM TotalStorage SAN Volume Controller does not support MPIO at this time. For updated information refer to:

http://www.ibm.com/servers/storage/software/virtualization/svc/index.html

Determine the installed SDDPCM level

You use the same command as for SDD, lslpp -l "*sdd*", to determine the installed level of SDDPCM. It will also tell you whether you have SDD or SDDPCM installed.

SDDPCM software provides useful commands such as:

￿pcmpath query device to check the configuration status of the devices

￿pcmpath query adapter to display information about adapters

￿pcmpath query essmap to display each device, path, location, and attributes

Useful MPIO commands

The lspath command displays the operational status for the paths to the devices, as shown in Example A-8.It can also be used to read the attributes of a given path to an MPIO-capable device.

Example: A-8 lspath command result

{part1:root}/ -> lspath pg Enabled hdisk0 scsi0 Enabled hdisk1 scsi0 Enabled hdisk2 scsi0 Enabled hdisk3 scsi7 Enabled hdisk4 scsi7

...

Missing hdisk9 fscsi0 Missing hdisk10 fscsi0 Missing hdisk11 fscsi0 Missing hdisk12 fscsi0 Missing hdisk13 fscsi0

...

Enabled hdisk96 fscsi2 Enabled hdisk97 fscsi6 Enabled hdisk98 fscsi6 Enabled hdisk99 fscsi6 Enabled hdisk100 fscsi6

The chpath command is used to perform change operations on a specific path. It can either change the operational status or tunable attributes associated with a path. It cannot perform both types of operations in a single invocation.

The rmpath command unconfigures or undefines, or both, one or more paths to a target device. It is not possible to unconfigure (undefine) the last path to a target device using the rmpath command. The only way to do this is to unconfigure the device itself (for example, use the rmdev command).

Appendix A. Open systems operating systems specifics 351