Its hard to give an exact answers, since you don't give any current
configuration information (db size, disk pool (if any), number and type of
drives, number of volumes, and if you have a library/silo).
I love the four 9840's with 100 volumes compared to the four 4490's with a
mix of 1200 short and extended volumes.
Assuming that you have a library/silo, you will find that you have a lot
more free drive time. If you do frequent restores from tape, request 3
drives. That way a drive is available for a restore during reclamation or
copy pool creation. 4 drives would give you more flexability.
We did not modify the reclamation process. Our database is small enough
that we expire and reclaim daily at 60%. We don't collocate. Because of
the drive speed, you may be able to review the colloation decision. That
could reduce the number of volumes that you need to buy.
On Tue, 14 Mar 2000, Marian L. Dalton wrote:
> I have additional questions on the 9840 for anyone who has converted to
> them.
> We are exploring the possibility of moving our adsm data to 9840's but I have
> concerns over how the reclamation process will be affected and whether I will
> end up holding a lot of partially filled big (expensive) tapes. We reclaim at
> 50% now (on E-tapes). When you (anyone) went to 9840's , did you modify your
> percentage for reclaim at all? Did you do reclaims any more or less often? (we
> schedule reclaims on both saturday and sunday, after an expiration on Friday
> night). Did you consider changing from or to collocation in either the backup
> pools or the copypools? (currently we collocate on the backuppool but not in
> the copy pool). And while we're at it, how many drives is the minimum you
> think it is reasonable to get away with? We are trying to configure just two,
> since most of my processes use only two drives today. But we also have a one
> minute mount retention today, that we would probably have to do away with,
> while
> insuring we don't do multiple tape processes concurrently. Ideally I'd ask for
> four drives, but since we have no money in the budget and are trying to
> convince
> management to do it anyway,both decrease our tape library and improve the tape
> performance, we are attempting to do this on a shoe-string. Thanks for any
> feedback...
>
> Marian Dalton
> Storage Administrator
> Central Maine Power
>
> "Jones, Bernard" wrote:
>
> > Hello Everyone:
> >
> > A few questions,
> >
> > 1 ) ....
> > 2) I'm also in the process of using 9840 tapes under ADSM for the first
> > time. Has anyone implemented 9840 long-tapes under ADSM ??? Was the
> > implementation process difficult ??? And again is this documented anywhere
> > ??
> >
> > Any/all help will be appreciated.
> >
> > Thanks,
> > Bernard A. Jones
> > Manager Storage Administration
> > (201) 703 - 7009
> >
> > -----Original Message-----
> > From: ANGEL BUGARIN [mailto:ANGEL.BUGARIN AT MAIL.SPRINT DOT COM]
> > Sent: Friday, March 03, 2000 4:45 PM
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject:
> >
> > ADSM-L MAIL
>
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