Originally posted by: SystemAdmin

Dear All,
I have DS 5020 which hangs whenever I change the lun ownership from one controller to another controller.When I do df -g, I can see the filesystems from the storage mounted but when i do change directory to that filesystem I cannot create any files there and I/O simply stops.The storage firmware is as follows:
Controller_Code_07738000
AIX Oslevel:6.1 tl 5
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Originally posted by: nagger

Hi,
This sounds like a zoning or SAN problem.
As far as AIX sees it the disks was online and it will be caching filesystem structure and data in the AIX file system cache.
After the change of controller the disk is offline but it can find and use some things in the cache but physical I/O is failing now.

Cheers, Nigel
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Originally posted by: SystemAdmin

Thanks a lot for reply.But my storage and server are directly connected and not via the SAN switch.
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Originally posted by: DanBraden

Check you paths to be sure. 

# lspath -F"name parent connection status path_status path_id"

I assume you're using the AIX PCM (aka. MPIO) for you multi-path code.  If so also run:

# mpio_get_config -Av   

to show more information about to which is the preferred controller and the DS5020 LUN name.

You might also want to get this fix:§https://www-304.ibm.com/support/docview.wss?uid=isg1IZ66020  which I found at https://www.ibm.com/developerworks/community/blogs/cgaix/entry/ds5020_and_vios?lang=en

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Originally posted by: raouf834

hello

we had the same problem ,i think u should switch off the aix server and then the ds storage ,after that switch on the exp of ds let time to reinitialisation , after switch on the DS controllers let reinitialised for 1 min  ,after that switch on ur aix server i hope i'll solve the problem

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