Yes :-)
The estimated capacity is set per devclass and is just an indication of
what you expect for tapes/volumes used in that devclass. This then gets
used to 'estimate' the % utilized per volume and to reflect the total size
of a storage pool (based on the number of scratch tapes that can be used
(maxscratch) and the estimated capacity).
Reality gets reflected once you go past the estimated capacity or if the
tape gets 'full' before the estimated capacity. For example the estimated
capacity for my 4mm DDS2 test environment is 8 gig, but I typically only
get 6-7 gig on them. When they are full % util goes to 100 and the
estimated capacity gets changed from 8gig to whatever is really on the
tape.
Contrast that to the old 3590B environment I used to work on where the
10Gig native carts would often get 40-60gig of SAP data on them. In this
environment we updated the 'estimated' capacity to 30Gig.
It doesn't really mean much, but if you like to use the estimates then it
is a problem in a library where you have mixed both 3590J & K
tapes. The drives are happy to read and write either tape, so you can
share them in the library, and you will then have a single devclass which
is used for both tapes. What do you set the 'estimated capacity'
at - 20gig, 40gig, higher (if you account for some compression)? That's
up to you :-)
Looking at this, what confused me, and I hope someone can accurately
answer is the following:
SAP003 PROD_TAPE_- 3590DEV2 35,803.7 98.6
Filling
The estimated capacity for the devclass is 30 gig, the tape is still
filling, but showing a % utilized of 98.6. I thought that it should show
100% utilized as soon as it reached the estimated capacity, but still be
'filling' until it reached the end of the tape.
Could it be that some data has already expired from this tape since it was
last written to? Do I misunderstand the 100% reflection?
Thanks,
Cameron.
--
==================================================
==================================================
Cameron McDonald Email: cameronm AT ibk.com DOT au
Innovative Business Knowledge (IBK)
Melbourne, AUSTRALIA
==================================================
On Mon, 18 Dec 2000, Kelly J. Lipp wrote:
> If you set the estimated capacity at some number, will it fill the tape
> beyond that capacity? I am under the impression that it won't.
>
> Kelly J. Lipp
> Storage Solutions Specialists, Inc.
> PO Box 51313
> Colorado Springs CO 80949-1313
> (719) 531-5926
> Fax: (240) 539-7175
> Email: lipp AT storsol DOT com or lipp AT storserver DOT com
> www.storsol.com
> www.storserver.com
>
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Kenneth & Susan Bury
> Sent: Monday, December 18, 2000 4:47 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: Estimated Capacity of 3590-K tapes
>
>
> You will have to manually change the default capacity in your devclass to 40
> GB. We noticed that when we upgraded to the 3.7 server we actually dropped
> to 10 GB. If you look at the help pages (on 3.7) you will notice that Tivoli
> thinks the 3590E-C capacity is only 10 GB. Go figure.
>
> Ken
>
> > -----Original Message-----
> > From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf
> > Of
> > Eliza Lau
> > Sent: Monday, December 18, 2000 14:45
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject: Estimated Capacity of 3590-K tapes
> >
> >
> > Hi All,
> >
> > We just upgraded all the 3590B1A drives in the 3494 to 3590E1A with the
> > option to support the Extended Length 3590-K tapes.
> > I did the following to redefine the drives:
> >
> > rmdev -l rmt1 -d
> > cfgmgr
> > adsm> upd devclass 3590tape format=3590E-C
> > adsm> del drive 3494lib tapedrive1
> > adsm> def drive 3494lib tapedrive1 device=/dev/rmt1
> >
> > The old 3590-J tapes are now showing an Estimated Capacity of
> > 20GB. However,
> > the new 3590-K tapes also show an Estimated Capacity of 20GB. Since the
> > K tapes have twice as much tape as the J tapes, they should be 40GB.
> > What do I need to do to make the K tapes show up as 40GB?
> >
> >
> > Server: AIX 4.3.3
> > ADSM 3.1.2.58
> >
> > Thanks,
> > Eliza
> >
> > ------------------------------------------------------------------
> > ------------
> > Eliza Lau
> > Virginia Tech Computing Center email : eliza.lau AT vt DOT
> > edu
> > Virginia Polytechnic Institute & State University
> > 1700 Pratt Drive
> > Blacksburg VA 24060 phone : (540) 231-9399
> > ------------------------------------------------------------------
> > ------------
> >
>
|
