Tina's right on - you should be making copies (backups of your
backups :->) of _all_ of your primary storage pools (disk _and_
tape) daily, in the same way that you back up your ADSM database.
Of course (under AIX, at least), you _could_ mirror
your disk storage pools, but that's generally not necessary.
Chapter 20 of the AIX Administrator's Guide goes over the options
quite thoroughly.

Something that I think may be often overlooked is that ADSM is a
*backup* mechanism - if your data doesn't get deleted on your
host machines frequently, the price of losing an ADSM storage
pool disk may not be too high.  The ADSM *client* machine still
has its data (unless there's been a far-ranging catastrophe, or a
really coincident failure)...  That's not to say that steps
shouldn't be taken to ensure the integrity of the ADSM server and
its data, just that I think sometimes it's possible to lose sight
of what ADSM's role in the enterprise may be.  And YMMV.

Pat Wilson
paw AT dartmouth DOT edu


>  Hi,
>
>  In the company I am working for their adsm system is used in the following 
> way....
>
>  1) aix clients are backup up to disk pools
>  2) These disk pools have migration thresholds of
>  low=0% high =80%
>  3) If the high is reached then it is migrated to a tape pool.
>
>  My question is this :
>
>  If during the daily backup this high threshold is not met on some of the dis
k pools,then this means that there is a whole load of client data residing on (
in our case)  1 disk.
>  If that disk pops then goodbye data ( could be maybe 3 days worth ?)
>
>  What is the solution to this ?
>
>  Is it possible to mirror the disk pools aix logical volume  to another disk
using aix ? or is this not possible because there are adsm disk pools in the lv
 ?.
>
>  Would it just be better to lower the high migrate threshold to a very low va
lue ?
>
>  There is no disaster recovery as yet for this machine (no offsite backups et
c ) but in the meantime I still do not want to end up losing any data due to di
sk failures etc.
>
>  Please help.
>
>
>
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