Re: Help Please with 3590 Hardware Compression
2001-11-19 08:54:21
Subject: |
Re: Help Please with 3590 Hardware Compression |
From: |
"Cook, Dwight E (SAIC)" <cookde AT BP DOT COM> |
Date: |
Mon, 19 Nov 2001 07:50:53 -0600 |
Look at the format of the device class for the drives.
If you let it default to "DRIVE" it will use all available hardware
compression...
I always tell clients to use compression and I also have the drives set to
use compression.
tsm: TSMSRV10>q dev f=d
Device Class Name: 3590E1A
Device Access Strategy: Sequential
Storage Pool Count: 6
Device Type: 3590
Format: DRIVE
<stuff deleted>
Syntax
>>-DEFine DEVclass--device_class_name----DEVType--=--3590------->
.-FORMAT--=--DRIVE-------.
>-----+------------------------+--LIBRary--=--library_name------>
'-FORMAT--=--+-DRIVE---+-'
+-3590B---+
+-3590C---+
+-3590E-B-+
'-3590E-C-'
<stuff deleted>
FORMAT
Specifies the recording format to be used when writing data to
sequential access media. This parameter is optional; the default value
is DRIVE.
The following are possible values for 3590 devices:
DRIVE
Specifies that TSM selects the highest format that can be
supported by the sequential access drive on which a volume is
mounted.
3590B
Specifies that TSM writes data using the basic (uncompressed)
format. This results in a tape capacity of approximately 10GB.
3590C
Specifies that TSM writes data using the compressed format. This
results in a tape capacity of approximately 10GB. However, this
format uses the tape drive's hardware compression feature so the
actual capacity may be greater depending on the effectiveness of
compression.
3590E-B
Specifies that TSM writes data by using the uncompressed format
similar to the 3590B format. This results in a tape capacity of
approximately 10GB.
3590E-C
Specifies that TSM writes data by using the compressed format
similar to the 3590C format. This results in a tape capacity of
approximately 10GB. However, this format uses the tape drive's
hardware compression feature so the actual capacity may be greater
depending on the effectiveness of compression.
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