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Check ODM

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astalavista

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Jan 2, 2009, 4:07:48 AM1/2/09
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Hi,

We tried to upgrade PowerPath (EMC product) on AIX 5.2
but after the upgrade no powerpath device found (hdiskpowerXXX)
we suppose a corruption in the ODM ...
How can we check the ODM ?
and get it right

Thanks in advance


Igor Pozgaj

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Jan 2, 2009, 12:18:13 PM1/2/09
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Have you tried running the /usr/lpp/*/bin/emc_cfgmgr?

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Igor Pozgaj

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Jan 2, 2009, 12:19:59 PM1/2/09
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On Fri, 02 Jan 2009 17:18:13 +0000, Igor Pozgaj wrote:

> On Fri, 02 Jan 2009 10:07:48 +0100, astalavista wrote:
>
>> We tried to upgrade PowerPath (EMC product) on AIX 5.2 but after the
>> upgrade no powerpath device found (hdiskpowerXXX) we suppose a
>> corruption in the ODM ... How can we check the ODM ? and get it right
>
> Have you tried running the /usr/lpp/*/bin/emc_cfgmgr?

Sorry, /usr/lpp/EMC/*/bin/emc_cfgmgr

astalavista

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Jan 3, 2009, 2:20:48 AM1/3/09
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>
> Sorry, /usr/lpp/EMC/*/bin/emc_cfgmgr
OK thanks, I will try this on monday
is it called by cfgmgr ?


Nicholas Buckley

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Jan 3, 2009, 3:59:18 AM1/3/09
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Hi,

emc_cfgmgr is part of the "EMC ODM" fileset and not part of PowerPath ...

Even so, Igor gives good advice.

IMHO your ODM is unlikely to be corrupted. That said, even modern versions
of PowerPath ( 5.x ) can have a few issues with upgrades, so I always do
this:

- varyoff all VGs

- remove all devices from control of PowerPath ( powermt remove dev=<each
power device> )

- remove all power devices ( rmdev -d -l < hdiskpowerx> )

- remove all hdisks ( rmdev -d -l <hdiskx> )

- remove the Powerpath device ( rmdev -d -l powerpath0 )

( you could put all the above in a script as you are sure to find it useful
in the future :-) )

At this point:

lspv - all you should see are rootvg's hdisks

note: that additional steps are required if you boot from SAN using
PowerPath devices, but you didn't mention this ...

- /usr/lpp/EMC/Symmetrix/bin/emc_cfgmgr - this will re-create all your
hdisks

- powermt config - this will re-create powerpath0, then all your power
devices

- lspv | grep power - you will see all your VGs listed

- varyon all your VGs

One other useful tip for AIX, if you have removed powerpath0 then the next
time you MUST run powermt config.

After that however you don't have to do this; instead you can run cfgmgr -vl
powerpath0

This does the same thing but gives you much better output on your screen.
Don't worry, this isn't a hack - it's EMC's recommendation.

Cheers and good luck !

Nick

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astalavista

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Jan 3, 2009, 7:32:36 AM1/3/09
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OK many thanks for your advices
I will try this on monday ...

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