Ok...
     set an administrative schedule to (daily) drop the high down to 5,
     then some time later bump it back up to 80 with another admin sched.
     If you want the data to be available on disk just turn cache on.  Then
     daily all your information is cleared from disk by migrating it to
     tape ALSO you don't get the delays in backups that might be caused by
     competition with migration processes ;-)
     If you then still worry about only a single tape copy and a tape going
     bad use the copy storage pool methodology to backup your backups.

     later,
           DWight


______________________________ Reply Separator _________________________________
Subject: A question about migration
Author:  ste.mc (ste_mc AT ZDNETMAIL DOT COM) at unix,mime
Date:    11/20/98 7:51 AM


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 disk po
ols,then this means that there is a whole load of client data residing on (in ou
r 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 usin
g 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 value
?

There is no disaster recovery as yet for this machine (no offsite backups etc )
but in the meantime I still do not want to end up losing any data due to disk fa
ilures etc.

Please help.



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