How to determine a VxVM Mirror

[Kevin]

Hi,

I am looking for a "quick" way to determine if a VxVM Volume is
Mirrored?

I'm thinking along the lines 'vxprint -h -g grpname -v volname | nawk
....', the logic would be something like :

# START
count=0
if this is not a RAID 5 Volume
then
for each plex
if the plex is not a log plex
then
count=count+1
end if
end for
end if

if count > 1
then
print "this is a volume is mirrored"
end if
# END

Then of course we get into checking plex states and....

Somebody, somewhere must have already written this?

Any advice greatfully recieved (to save me some time).

Cheers

Kevin

[Darren Dunham]

Kevin <kevin.hickman@sainsburys.co.uk> wrote:

> Hi,

> I am looking for a "quick" way to determine if a VxVM Volume is
> Mirrored?

> I'm thinking along the lines 'vxprint -h -g grpname -v volname | nawk
> ...', the logic would be something like :

> # START
> count=0
> if this is not a RAID 5 Volume
> then
> for each plex
> if the plex is not a log plex
> then
> count=count+1
> end if
> end for
> end if

> if count > 1
> then
> print "this is a volume is mirrored"
> end if
> # END

> Then of course we get into checking plex states and....

Yup... That's pretty annoying. In addition, you have to check if a plex
is sparse, and that the plexes cover all the blocks in the volume. (at
least I've been bitten by thinking a volume was fully mirrored but it
wasn't).

> Somebody, somewhere must have already written this?

I haven't come across it, but it's possible.

You might check the veritas-vx archives at
[url]http://mailman.eng.auburn.edu/mailman/listinfo/veritas-vx/[/url]

If you write it yourself, the following pieces of information from
vol_pattern might be useful for parsing...

v_pl_num or v_nplex
A number representing the number of plexes associ-
ated with the volume.

v_pl_name or v_plex or v_plexes
The set of plex names that are associated with the
volume.

pl_compact
A boolean value that is true if the plex is com-
pact. A plex is compact if its entire length is
mapped by subdisks, leaving no holes. Note that
the length of a plex is computed as the length to
the end of the last block in the plex address
space that is mapped by a subdisk.

--
Darren Dunham [email]ddunham@taos.com[/email]
Unix System Administrator Taos - The SysAdmin Company
Got some Dr Pepper? San Francisco, CA bay area
< This line left intentionally blank to confuse you. >