Originally posted by: styerd

I enabled native MPIO support and converted my hdisks from "DS4700 Disk Array Device" to be "MPIO Other DS4K Array Disk". The "lspath" now shows a path thru each adapter. Good. When I disable the path that "iostat" shows is being used I/O switches to the other path and "mpio_get_config" shows that hdisk on the "non-preferred" path.

The question is, when I re-enable the path should MPIO switch back to the preferred path? I checked and have IZ17428 which appears to be complaining about such a problem. But, maybe native MPIO doesn't support this and this kind of recovery requires SDDPCM (the "follow-on" path control module)?
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Originally posted by: jvk

By default AIX and Windows have AVT (Auto Volume Transfer) disabled and Linux has AVT enabled. So try to find 'autorecovery' parameter in your config....
With RDAC it comes under dar and with MPIO you may find it under hdisk:

lsattr -El hdisk0
..PCM PCM/friend/otherapdisk
..PR_key_value none
..algorithm fail_over
..autorecovery no <---
......

Give it a try and set 'autorecovery' to 'yes'. And sure mentioned APAR have in place.
I would say SDDPCM is not required for this.
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Originally posted by: styerd

==> instfix -ik IZ17428
All filesets for IZ17428 were found.
==> lsattr -El hdisk100 -a autorecovery
autorecovery yes Path/Ownership Autorecovery True

I enabled "autorecovery" but still no luck. With "chpath" I can force a switch from one path to the other. I can see "mpio_get_config" report either "preferred" or "non-preferred" as expected but with both paths enabled the system does not switch to the "preferred" path. Is there something else I need to change?
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Originally posted by: styerd

Perhaps it's the type of transition. It seems that a state transition from "failed" to "enabled" does eventually auto recover to the preferred path ... it takes about 5 minutes ... but I guess the time period is not really important. A transition from "disabled" to "enabled" does not initiate recovery to the preferred path as far as I can tell. Maybe someone thinks it's "working as designed" but I think I'll write a PMR just to be sure or to get it documented.
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Originally posted by: kappa

also,

dont trust the mpio_get_config after changes, always check by using the sm client gui.

=> volume names changed
=> ownership changed
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