Reusing SSA disks used as RAID array members

Reusing SSA disks used as RAID array members

Post by Hasso Brüc » Fri, 19 Mar 1999 04:00:00

>Does anyone know how to format the ssa disks which were previously
>members of a RAID-5 array. The array is gone now and the disks can't be
>via the normal procedure which clears the information from the drive..
>Format doesn't work either.

what format ?! what you mean by _can't_be_removed_?
Did you just blow up SSA-RAID controller or something,
installed new one and now cannot get rid of stale physical volumes?

"rmdev -l hdiskx  -d" removes this raid array disk from ODM that was known
to AIX as physical disk. May be you need remove and reconfigure physical
SSA disk too "rmdev -l pdiskx -d".
After that run "cfgmgr" and all available and working SSA physical disks
will be configured as ordinary physical disk .(like SCSI disks, just
one-to-one mapping exsist between hdiskx and pdiskx, not many-to-one
like with SSA RAID5 disks)
Now you can proceed with volume group creation an so on. There is no need to
format drives... :-)

Oh, yes, If you had any volume groups on those failed disks...
run "exportvg <vg name>" to remove VG information from ODM.

Hasso Brck
Technical Manager
Korel SYS Ltd.


Reusing SSA disks used as RAID array members

Post by Alex Leki » Fri, 19 Mar 1999 04:00:00

Thanks for the reply. To clearify the situation little bit:

A bunch of ssa disks were at some stage members of an ssa raid-5 array. The
system was dismantled and I am now trying to use these disks for other purposes.

It appears that once a disk is made a member of the array, a bit is set on some
of the
disk registers (or may be something is written on the plater itself). In any
the disk can't be configured. cfgmgr will create a pdisk but not the hdisk.
dosn't work either and neither does the ssa format through diag. IBM has been
looking at it for couple of days, but so far the only reply was: "You should
removed the disks from the array through SMIT?!!"



1. Re-using SSA disks previously members of a SSA RAID array

On Tue, 16 Mar 1999 20:12:12 -0500 a carbon-based biped by the name of Lekic

Somewhere under the SSA Raid menu entry in the smit|Devices menu,
there is a point that will let you change the usage of a SSA disk.
If a disk has been a member of an array, it is probably listed as
'Array candidate disk' or 'Hot Spare'.
Change that to 'AIX system disk' for all the disks, and you should
be able to re-use the units as normal SSA disks.



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