[pca] veritas encapsulated root disks

[dima.kazhdan at ca.pwc.com]

Dagobert Michelsen <dam at blastwave.org> 
Sent by: pca-bounces at lists.univie.ac.at
06/14/2008 03:11 PM
Please respond to
"PCA \(Patch Check Advanced\) Discussion" <pca at lists.univie.ac.at>


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Subject
Re: [pca] veritas encapsulated root disks




Hi Dago.

By un-encapsulated volumes I mean the volumes not created as a result of 
root disk encapsulation.
For example your root disk initially has 2 native partitions, say / and 
/var.
After root disk encapsulation u end up having 2 volumes, rootvol and var.

Now one starts creating additional volumes on the same disk. Then the disk 
gets mirrored.

So when the disk gets unencapsulated in orther to have an alternative root 
disk as a backup copy, u end up having 2 partitions / and /var again but 
other volumes are obviously gone.

So my question is what would be the best strategy to recover from a failed 
patch by booting from the alternative mirror?

Also i'm not sure what u mean by saying "the need for encapsulated root 
has vanished."?

How can one mirror an unencapsulated disk?

Thanks in advance.

Dima






Hi Dima,

Am 13.06.2008 um 21:48 schrieb dima.kazhdan at ca.pwc.com:
> Wondering how one deals with patching servers that have root disks 
> encap'd with vxvm?

Basically this is the same as for unmirrored disks.

> Espesially when root disk has non-encapsulated volumes on it?

The root-disk can not have non-encapsulated volumes, because
the root-volume must always be encapsulated and therefore
does not have a public slice. The root-mirror can have
such volumes, but I don't see why this should be any different.

An explanation of a good veritas root configuration is in
   <http://www.sun.com/blueprints/0800/vxvmref.pdf>

However, as nowadays the rootdg is no longer mandatory
the need for encapsulated root has vanished.

> Would there be a procedure of splitting the mirror without losing 
> non-encapsulated volumes?

As long as the private region is intact and referenced
from both sides of the mirror you should be able to access
the volumes in both cases. But I am unsure if I understood
your scenario correctly.

Kind regards

   -- Dago

PS: Your question would be more appropriate on a veritas
group or mailing list like these:
   <http://news.entsupport.symantec.com/dnewsweb.exe? 
cmd=xover&group=veritas.volume_manager.english&utag=>
   <http://mailman.eng.auburn.edu/mailman/listinfo/veritas-vx>




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