Estimated capacity is "estimated". You can define it is 1 MB or 2000 GB. It
is just a prediction. When data is actually written and tape end reached
TSM changes this value to actual capacity.
So do not look to volumes in "Filling" state, look on to "Full" ones.
Or you can check (and change but be careful) in device class. If the FORMAT
is 3590(E)B this means uncompressed. If it is 3590(E)C then it is
compressed. If is DRIVE then the maximum drive capacity is used (usualy
with compression).
And on the end: If compression is already done at the client side tape
drives will be unable to do much more. So even with drive compression
turned on client compression will take over. So to use drive compression
you have to disable client compression.
Zlatko Krastev
IT Consultant
Farren Minns <[EMAIL PROTECTED]> on 19.11.2001 13:45:31
Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc:
Subject: Re: Help Please with 3590 Hardware Compression
Hi Maurice
Are we talking about the estimated capacity being over 10GB (I do have
quite a lot of volumes in this state).
Thanks very much for your help
Regards
Farren Minns
Maurice van 't Loo <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 19/11/2001
11:17:13
Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc:
Subject: Re: Help Please with 3590 Hardware Compression
If you do a Q VOLUME, you can see how much data is written on a tape.
If you use 10GB tapes, and there is more GB's written, you can assume that
there is hardware compression.
Regards,
Maurice van 't Loo
The Netherlands
----- Original Message -----
From: "Farren Minns" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, November 19, 2001 12:09 PM
Subject: Help Please with 3590 Hardware Compression
> Fellow TSMers
>
> I have a question regarding compression and 3590 drives. I must apologise
> that I am not the most technically minded person, so responses in
laymen's
> terms are most appreciated.
>
> Set-up
>
> TSM 3.7.3.8 Server running on a Solaris 7 box
> Attached to an IBM 3494 library with two 3590 drives
>
> I understand that compression can be done from the client side, but have
> been told that hardware compression can be a lot better and quicker. Can
> anyone tell me how to find out if 3590 hardware compression is in use,
and
> how to set it up is it isn't (or pointers in the right direction).
>
> At the moment our drives are enabled as follows:-
>
> Library Name Drive Name Device Type Device ON LINE
> ------------ ------------ ----------- ----------------
--------
-----------
> 3494A DRIVE1 3590 /dev/rmt/3stc Yes
> 3494A DRIVE2 3590 /dev/rmt/5stc Yes
>
> Thanks in advance for any help
>
> Farren Minns
