Re: Tape capacity observations

Kelly, he is not getting less than the rated capacity of the tape.
When STK marketing says 9840's can hold 20 g, they mean
20,000,000,000 bytes.  When converted to what computer geeks
normally think of as a gigabyte, the capacity is 19.2 g.
The tape hardware compression is smart enough to just pass thru
uncompressable blocks.

--
--------------------------
--------------------------
Bill Colwell
Bill Colwell
C. S. Draper Lab
Cambridge, Ma.
bcolwell AT draper DOT com
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In <NDBBJCAICLAGCENNAFFFKELJHDAA.lipp AT storsol DOT com>, on 10/12/01
In <NDBBJCAICLAGCENNAFFFKELJHDAA.lipp AT storsol DOT com>, on 10/12/01
   at 01:17 PM, Kelly Lipp <lipp AT STORSOL DOT COM> said:

>I'm guessing he is compressing on the client side and that's why his
>compression is actually less than the native capacity of that tape.

>Kelly J. Lipp
>Storage Solutions Specialists, Inc.
>PO Box 51313
>Colorado Springs, CO 80949
>lipp AT storsol DOT com or kelly.lipp AT storserver DOT com
>www.storsol.com or www.storserver.com
>(719)531-5926
>Fax: (240)539-7175


>-----Original Message-----
>From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
>Lawson, Jerry W (ETSD, IT)
>Sent: Friday, October 12, 2001 5:26 AM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: Tape capacity observations


>Date:           October 12, 2001                        Time: 8:21 AM
>From:   Jerry Lawson
>                The Hartford Insurance Group
>860     547-2960                jlawson AT thehartford DOT com
>----------------------------------------------------------------------------
>-
>Hello -

>I'm posting the following question for a co-worker here that doesn't have
>list access.  I should add that we are compressing the data on the TSM
>client.

>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

>We are implementing 9840 tape technology (in 3590-1 device image format) in
>our TSM environment and have been getting around 19,500 MB's on a cartridge
>when 100% full. I was wondering if this used capacity was typical for this
>type of media?!? Thanks in advance for any help in validating the results
>we've been seeing.



>----------------------------------------------------------------------------
>-
>                                                     Jerry

>Insanity is doing the same thing over and over....and expecting the results
>to be different - Anon.



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