If you haven't begun using copypools yet, then if the disk goes bad you've
lost your backups.  However, this is the same as if you did migrate it all
to tape and then the tape goes bad is unreadable.  The backups are gone.
The best thing to do is to backup all your local storage pools (disk & tape)
to copypools, or at least the ones that contain backups you don't want to
lose.

At my shop, I've never had the disk my storage pools use go bad.  I have had
tapes go bad and had to restore them from the copypool.

Tina

> -----Original Message-----
> From: Steven McNicholas [SMTP:ste_mc AT ZDNETMAIL DOT COM]
> Sent: Friday, November 20, 1998 8:52 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      A question about migration
>
> 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 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
> 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 failures etc.
>
> Please help.
>
>
>
> Free web-based email, anytime, anywhere!
> ZDNet Mail - http://www.zdnetmail.com