You're right. I believe the 300GB number is for the older J1A drives. Our JA 
tapes should be 500GB uncompressed and we're seeing anywhere from 800GB to 
1.4T(TDP backups) compressed. I'm not sure, but for this NDMP data, it looks 
like the JA tapes were getting around 700GB and the JB are getting around 850GB.

Sam Sheppard
San Diego Data Processing Corp.
(858)-581-9668
 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Richard Rhodes
Sent: Tuesday, June 08, 2010 12:00 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] 3592JB tapes

What kind of data is it?
How many tape does the data fit on when using the 300gb tapes?
(trying to get some idea of what to expect for compression)

I thought a 3592JA tape was 500gb when used in a 3592-e05.






             "Sheppard, Sam"
             <SSheppard@SDDPC.
             ORG>                                                       To
             Sent by: "ADSM:           ADSM-L AT VM.MARIST DOT EDU
             Dist Stor                                                  cc
             Manager"
             <[email protected]                                     Subject
             .EDU>                     3592JB tapes


             06/08/2010 02:21
             PM


             Please respond to
             "ADSM: Dist Stor
                 Manager"
             <[email protected]
                   .EDU>






We have just purchased a bunch of 3592JB tapes (700GB uncompressed
capacity) to use for some large NDMP backups. My first test last night
backing up around 1.8TB of data completely filled two of these tapes. This
is only marginally better than what I was getting on the 3592JA tapes which
are rated at 300GB uncompressed.  We have 8 TS1120 (3592-E05) drives in a
3494 library and are running TSM 6.1.3.4.  The device class specifies
FORMAT=DRIVE which should cause recording at the highest available density.
I would think almost all of this data would fit on one of these volumes.
Any ideas where I am going wrong?

Thanks
Sam Sheppard
San Diego Data Processing Corp.
(858)-581-9668


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