[no subject]

Steven,
        I agree with Tina about using copypools for both disk and tape.  We
are also using RAID 5 for our diskpool which has saved us at least once.

> ----------
> From:         Hilton Tina[SMTP:HiltonT AT TCE DOT COM]
> Reply To:     ADSM: Dist Stor Manager
> Sent:         Friday, November 20, 1998 9:18 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Re: A question about migration
>
> 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.
> >
> >
> >
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>