Using Powerpath due to Fiber Channel Card Moves to Second Card Cage

[zap_2]

Hi Unix Gurus,

If I do ioscan for our two existing fiber channel look like follow:

# ioscan -fnC fc
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
fc 0 0/0/2/0/0 td CLAIMED INTERFACE HP Tachyon TL/TS Fibre Channel Mass Storage Adapter
/dev/td0
fc 1 0/0/10/0/0 td CLAIMED INTERFACE HP Tachyon TL/TS Fibre Channel Mass Storage Adapter
/dev/td1

We have planned to move one of the above FC cards to PCIX IO Card Cage.Let say I have moved fc #1 with H/W Address 0/0/10/0/0 to second PCIX IO Card Cage so this FC card H/W Address have changed to 0/0/9/0/0.What should I do to deal with this H/W path changes? Sorry for this question because I am new in powerpath.Any replies will be appreciated.Thanks in advance.

[Devender Khatana]

Hi,

I am not aware about the powerpath but with some similar products of HP in this scenarios the device files for all the disks will change and you need to reimport your volume groups otherwise it will be accessible from only one path & also will through errors about disk devices unable while doing vgdisplay for those VGs.

HTH,
Devender

[baiju_3]

Hi ,

powermt check;powermt config
powermt display .

Verify that the new H/W path is displayed.

The device files for the disks will change, so you need to do insf -e ; update the volume groups by vgimport.


Thanks,
BL.

[Tim Nelson · Accepted solution]

powerpath will recognize the new path but you will need to cleanup and update some vg configs.

I would do the following.
-If the path and storage you are moving is defined in the vg config, reduce it. This is assuming you assigned both paths into the vg, one as an alternate pv path.
-shutdown and move hba, reboot
-ioscan -knfH new_path
-insf -eH new_path (if needed)
-symcfg discover
-powermt check
-powermt save
-add new path/storage back into vg configs as alternates
-cleanup old device files (rmsf -H old_path
This should take care of things.

[Tim Nelson]

forgot the powermt config (sorry)

powermt check (yes to remove dead paths)
powermt config
powermt display