Re: SSA RAID-5 replace disk
- From: Roger Deschner <rogerd@xxxxxxx>
- Date: Thu, 29 Nov 2007 16:12:08 -0600
After the physical replacement, you have to really get rid of pdisk0.
(In that order! 1. Physical replacement, 2. Delete the definition of the
old pdisk0.) It is required that you NOT keep the old definition in the
database in a case like this. (That disk has failed and you're throwing
it out, so banish its memory.)
rmdev -l 'pdisk0' '-d' (or smitty with "keep def in DB...no")
Then all you have to do is run cfgmgr and it will find, recognize, and
define the new disk. It will likely come up first as a system disk, with
both a pdisk number and an hdisk number, which you don't want. You'll
have to go into smitty and change it to an Array Candidate (SSA Free)
disk (which will delete its hdisk number), and then add it to the array.
It's new disk number might or might not be pdisk0 - and this is
something you have no control over. (AIX systems have the right to
completely renumber all the pdisks and hdisks on you without warning, so
it's best to just be prepared for that to happen someday. I deal with it
by keeping track of serial numbers.)
After you run cfgmgr, you should go into diag's SSA tools and see what
your new disk's pdisk number and status is. This is most easily
discovered with Link Verification. Then from diag, there is a direct
link into smitty SSA Disk Arrays to add the pdisk to your RAID5 array
and finish the job.
(We still have about 300 SSA disk volumes in everyday use, in all kinds
of RAID configurations.)
Roger Deschner University of Illinois at Chicago rogerd@xxxxxxx
On Thu, 29 Nov 2007, -ray wrote:
Think back to the days of SSA haha...
I have a SSA RAID-5 array with no hot spare. pdisk0 died. I set it to
servicemode, then physically replaced it before doing an rmdev. Now I
can't get the new disk defined. It shows up as defined, but when i try to
mkdev i get the below error. Perhaps remnants of the old disk hanging out
somewhere? The diag link verification show a break in the loop where
pdisk0 is. The array is still up, just degraded. Any advice on how to
prceed is appreciated.
# lsdev -Cl pdisk*
pdisk0 Defined 40-60-P SSA Physical Disk Drive
pdisk1 Available 40-60-19D1-16-P SSA160 Physical Disk Drive
pdisk2 Available 20-58-19D1-12-P SSA160 Physical Disk Drive
pdisk3 Available 20-58-19D1-05-P SSA160 Physical Disk Drive
pdisk4 Available 40-60-19D1-01-P SSA160 Physical Disk Drive
pdisk5 Available 20-58-19D1-09-P SSA160 Physical Disk Drive
pdisk6 Available 20-58-19D1-08-P SSA160 Physical Disk Drive
pdisk7 Available 40-60-19D1-04-P SSA160 Physical Disk Drive
# mkdev -l pdisk0
Method error (/usr/lib/methods/cfgssapdisk):
0514-022 The specified connection is not valid.
ray
--
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Ray DeJean http://www.r-a-y.org
Systems Engineer Southeastern Louisiana University
IBM Certified Specialist AIX Administration, AIX Support
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