Working with many disks on the VIO Server can be confusing and it is sometimes hard to identify the common hdisk (or hdiskpower) names for the same SAN devices.  Here are a few tips on how to identify the same SAN disks across multiple VIO Servers.

 

List all the disk that are availabe.  Not a great deal of helpful information to identify the disks in this report as all the PVIDs are set to none.  Any disks that have a PVID shown may not show the true PVID, as this could be changed on the Client LPAR and if so, that does not update the VIO Server ODM with the new PVID, so I try to avoid using PVIDs on the VIOS.

# lspv -avail

NAME              PVID    SIZE(megabytes)
hdiskpower5       none    46035
hdiskpower6       none    46035
hdiskpower7       none    46035
hdiskpower8       none    46035
hdiskpower9       none    46035
hdiskpower10      none    46035
hdiskpower11      none    46035

 

List all the disk that are free and available to be mapped to a VIO Client.

# lspv -free

NAME            PVID    SIZE(megabytes)
hdiskpower11    none    46035

 

How to find the UDID or UUID for the SAN device.  If the string (UDID/UUID) to the right of the ==> is that same for a device on 2 or more VIO Servers, then that device is the same SAN disk.

# oem_setup_env

# lspv -u | awk '{ print $1 " ==> " $4 }'

hdiskpower10 ==> 1D012343CC09SYMMETRIX03EMCfcp
hdiskpower11 ==> 1D012343D009SYMMETRIX03EMCfcp