RE : RAID-5 Configuration on 2104 disk subsystem

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Date:         Tue, 7 Dec 2004 12:36:39 -0500
To: aix-l@Princeton.EDU

As I mentioned on my previos email, I was on the worst case scenario
which I had to recreate the RAID config.

I emphasize on always DOCUMENT and save your original system
configuration, including your RAID configuration. It was a life saver
for me on this case.

Here is how I was able to recover from this problem.

Using the RAID Manager Menu - smit ibmscraid , I deleted the DEAD disk
array.

Using my original documented RAID configuration, from the SMIT RAID menu
I created a new disk array on the original RAID adapter. It is important
that you use the same parameters as your original RAID configuration or
it may not work. A new HDISK was created which had the same hdisk name
as the original one.

From the command prompt, I issued a varyonvg on the volume group which
contained the hdisk. Then mounted the filesystems, and VOILA! All my
data came up without any corruptions....

I hope this helps someone in the future.

Rolando Manaog

-----Message d'origine-----
De : Rolando Manaog [mailto:rmanaog@videotron.net]
Envoyé : lundi, décembre 06, 2004 6:40 PM
À : 'IBM AIX Discussion List'
Objet : RE : RAID-5 Configuration on 2104 disk subsystem

Guys,

I found the solution to this problem. It worked. I will let you know
once done.

Regards,

Rolando

-----Message d'origine-----
De : IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] De la part de
Willeat, Todd
Envoyé : lundi, décembre 06, 2004 6:00 PM
À : aix-l@Princeton.EDU
Objet : Re: RAID-5 Configuration on 2104 disk subsystem

There is an option to read the config from the disks, but if you already
accepted the other config the RAID adapter probably wrote the new config
to
the disks...

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
Rolando Manaog
Sent: Monday, December 06, 2004 4:55 PM
To: aix-l@Princeton.EDU
Subject: RAID-5 Configuration on 2104 disk subsystem

Hello everyone,

Does anyone how to recover a lost RAID5 configuration?

Let me explain my problem, I have 2 PCI 4-channel Ultra-3 SCSI RAID
Adapters connected to a 2104-DU3 disk subsystem ( dual-bus mode ). One
of
the RAID adapters failed. The failed card was replaced but I
cross-connected
the cable inadvertently. The system complained about changed
configuration
and I somehow accepted the change ( duh! ).

I now have the correct cable connections but I now can not recover the
disks
because they are detected as DEAD. I tried to recover the failed disks
but
it failed everytime. I eventually had to remove the failed array from
the
configuration. BUT does the 2104 disk subsystem save the configuration
somewhere else? I am now on a worst case scenarion, I'd hate to
re-create
the array again...

Let me know.

Rolando Manaog

Administrateur Systèmes UNIX / UNIX Systems Administrator

Vidéotron Télécom Ltée.

manaogr@videotron.ca

514-380-4602

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