Very nice explanation,
Thanks you
On Wed, Jul 7, 2010 at 11:00 PM, Richard Sims wrote:
> Specifying 3592C would be a change from your DRIVES specification, but it
> does not necessarily represent any change over how TSM has been writing data
> to tape for you: a spec of DRIVE *should* use com
Specifying 3592C would be a change from your DRIVES specification, but it does
not necessarily represent any change over how TSM has been writing data to tape
for you: a spec of DRIVE *should* use compression. Specifying 3592C explicitly
tells TSM what you want, with no ambiguities or vagueness
I was wondering if there is a way to increase the capacity of the storage
pool without adding volumes. I thought changing devclass format to
compressed will affect the existing volume capacities and I could gain lots
of space by reclamation.
What I conclude from your post is that only for new volu
Nothing happens to existing volumes: they remain as readable and writable as
they always have been. TSM *should* have been writing the volumes to the
maximal capabilities of the tape drive technology; and the tape drive senses
the format used for partially written volumes so as to continue usin
Thanks Richard,
What happens to existing volumes if I change the devclass format to
compressed? I mean, should TSM update the "estimated capacity" of volumes?
Regards
The values shown in the "Read Formats" and "Write Formats" fields of Query
DRive output are the values that can be specified with the FORMAT parameter of
the device class definition: they report capabilities, not what is in force at
the moment. Your Devclass definition governs actual I/O method
Hi,
1. - Format 3592C/drive uses drive compression: show libr ( if you want to
check
it )
2.-Compressed files are not compressed twice
- Mensaje original
De: Mehdi Salehi
Para: ADSM-L@VM.MARIST.EDU
Enviado: mié,7 julio, 2010 13:36
Asunto: when TSM uses tape compression?
Hi,
The
Hi,
The format of a device class is set to "drive" and "query drive" shows the
read and write format is "3592C,3592". The question is when does TSM uses
the compressed format? In a TSM 5.3 system, almost all volumes are 300GB (q
vol) except one of them. I cannot explain why TSM have not treated thi
