Hi Eric,
Then which way do you think is the best way to gain some space on 3570
tapes.
Whether I should send compressed files to tape or uncompress, you said that
" tape can contain up to 15 Gb"  How?  It's not clear to me?

Thanks,
Maporce

From: "Loon, E.J. van - SPLXM" <Eric-van.Loon AT KLM DOT NL>
Reply-To: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Magstar MP 3570, B-Series
Date: Thu, 30 Sep 1999 11:00:59 +0200

Hi Maporce!
I don't think you can turn of hardware compression on a 3570 drive. So
hardware compression IS on in your case.
The native capacity of a 3570 cartridge is 5 Gb. (7 Gb. for the new XL
tapes). The 3570 drive offers compression and if you send uncompressed data
to ADSM you are likely to see a 1:3 compression, so the tape can contain up
to 15 Gb. However, you are sending already compressed data to ADSM (you say
you have compression on at the client side). That's why hardware
compression
doesn't help you. You can't gain from compressing compressed data.
ADSM reports the amount of (already compressed at the client side) data
written to the tape which will never be much more than the native tape
capacity: 5 Gb.
Kindest regards,
Eric van Loon


-----Original Message-----
From: Maporce Ajahko [mailto:maporce AT HOTMAIL DOT COM]
Sent: Thursday, 30 September, 1999 08:08
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Magstar MP 3570, B-Series


Anybody is using Magstar MP 3570, B-Series.  Does this system has hardware
level compression option?
If not, how can I utilize this system more with ADSM and get more space on
each tape.  As of now, without having compression I'm only getting a bit
over 5 GB of space.  I have client "COMPression  to YES"  Also I even
recently changed "Recording Format"
on server to "C" or 3570C which as help is indicating "Specifies that ADSM
writes data using the compressed format. This format, however, uses the
tape
drive's hardware compression feature, so the actual capacity may be
greater,
depending on the effectiveness of compression."  No use, same 5 GB.  I
heard
you can get even up to 20 to 30 GB on each tape.
Any light, appreciate.


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