Jeff,

Compressing more than once generally doesn't gain anything in
terms of space reduction, in fact there are certain instances in
which additional compression passes result in *larger* files.

Since you are compressing at the client side, and you are
averaging about 35GB on a 30GB native tape, I'd say you're
getting pretty good storage utilisation.

 -- Tom

Thomas A. La Porte
DreamWorks SKG
tlaporte AT anim.dreamworks DOT com

On Wed, 20 Jun 2001, Jeff Bach wrote:

>What is my problem?
>
>I am just going to 3590K.  I use client compression on everything.  I
>compress on the tape drives also.
>
>I tried to define the format as 3590b, but it doesn't allow me to access the
>drives.  I currently have it set to drives.
>
>Has anyone seen this?  This seems to be a small amount of data.
>
>H00924                    DB_TPOOL     TAPE3590K    35,694.3  100.0    Full
>
>H00925                    DB_TPOOL     TAPE3590K    35,490.6  100.0    Full
>
>H00926                    DB_TPOOL     TAPE3590K    35,765.3  100.0    Full
>
>H00927                    TAPE3590     TAPE3590K    36,007.6  100.0    Full
>
>H00928                    TAPE3590     TAPE3590K    40,960.0   29.4  Filling
>
>H00929                    DB_TPOOL     TAPE3590K    35,635.3  100.0    Full
>
>H00930                    DB_TPOOL     TAPE3590K    35,554.6  100.0    Full
>
>H00932                    DB_TPOOL     TAPE3590K    40,960.0   49.2  Filling
>
>H00933                    DB_TPOOL     TAPE3590K    35,882.4  100.0    Full
>
>H00934                    DB_TPOOL     TAPE3590K    35,904.1  100.0    Full
>
>H00935                    DB_TPOOL     TAPE3590K    35,629.7  100.0    Full
>
>H00936                    DB_TPOOL     TAPE3590K    35,887.2  100.0    Full
>
>H00937                    DB_TPOOL     TAPE3590K    35,786.8  100.0    Full
>
>H00938                    DB_TPOOL     TAPE3590K    35,710.0  100.0    Full
>
>
>Jeff Bach
>
>> -----Original Message-----
>> From: Richard Sims [SMTP:rbs AT BU DOT EDU]
>> Sent: Wednesday, June 20, 2001 10:28 AM
>> To:   ADSM-L AT VM.MARIST DOT EDU
>> Subject:      Re: Data on my tapes
>>
>> >Ok, how much data are you getting on a 3590 "K" tape.
>>
>> David - A rough visual average that I see on my full tapes is 58 GB,
>>         in backup and copy storage pools.  (If using HSM, expect
>> much less, because it doesn't Aggregate.)
>>
>>   Richard Sims, BU
>
>
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