Adding disks into Veritas

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To: "'sunmanagers@sunmanagers.org'" <sunmanagers@sunmanagers.org>
Date: Fri, 30 Jul 2004 12:07:31 +0100

Hi all,

We are trying to add a couple of disks into a Veritas disk group, and
experiencing a few problems..

Basically, we removed 4 disks from 1 disk group, by removing the volumes on
them, taking them out of the dg, then offlining them. Then we added them
into a new (previously existing) dg, onlined them, enabled them. Now we are
creating a couple of mirror volumes (redo3 and redo4) on them.

v redo3 fsgen ENABLED ACTIVE 8388608 SELECT -
pl redo3-01 redo3 ENABLED ACTIVE 8388608 CONCAT -
RW
sd sci2db-19-01 redo3-01 sci2db-19 0 8388608 0 c0t0d7
ENA
pl redo3-02 redo3 ENABLED ACTIVE 8388608 CONCAT -
RW
sd sci2db-21-01 redo3-02 sci2db-21 0 8388608 0 c2t0d7s2
ENA

v redo4 fsgen ENABLED ACTIVE 8388608 SELECT -
pl redo4-01 redo4 ENABLED ACTIVE 8388608 CONCAT -
RW
sd sci2db-20-01 redo4-01 sci2db-20 0 8388608 0 c0t0d8s2
ENA
pl redo4-02 redo4 ENABLED TEMPRMSD 8388608 CONCAT -
WO
sd sci2db-22-01 redo4-02 sci2db-22 0 8388608 0 c2t0d8s2
ENA

Ignore the fact the redo is still building in the above output.

The question is, why is it that only the first desk device has the proper
short name of c0t0d7, and all the others have got the slice information
appended to the device name? We added the disks (including re-initializing)
in exactly the same way for all disks, but no matter how many times we
remove and re-add these 3 disks, we are getting the longer name. It doesn't
appear to cause a problem, but we have never seen this anywhere before, and
don't like the look of it. How can we add the disks and keep to the
standard disk device naming conventions that don't include the slice info?
When these disks were in the previous dg they didn't look like this.

Also, as an aside, when you create a volume that is mirrored from the start,
why does Veritas choose to make sub volumes, and place the volume on those,
instead of straight on the disks as it does when you create a standard
volume, and then mirror it as a separate step?

Regards

Dan.

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