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тАО03-06-2002 08:48 AM
тАО03-06-2002 08:48 AM
How to maximize compression on DAT24/HP-UX
Am I getting the maximium compression? How do
I get better compression? I'm using dump.
Thanks
-john
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тАО03-06-2002 09:17 AM
тАО03-06-2002 09:17 AM
Re: How to maximize compression on DAT24/HP-UX
If all that is fine above, then you may want to check the DIP switches on the bottom of the tape drive. Defaults for DDS3 are switch 3 = off, all others on.
-Bob
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тАО03-06-2002 10:51 AM
тАО03-06-2002 10:51 AM
Re: How to maximize compression on DAT24/HP-UX
120 units. I was wondering/hoping someone
my have the optimum configuration for maximizing the amount of data to put on the tape. I'm using dump with the following options: 0udsf 60000 4000 $tape
I don't know if 60000 and 40000 are the best values for tape density and length. Do you?
Thanks
-john
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тАО03-07-2002 12:06 AM
тАО03-07-2002 12:06 AM
Re: How to maximize compression on DAT24/HP-UX
From "man dd":
'WARNINGS
You may experience rouble writing directly to or reading directly from a cartridge tape. For best results, use tcio(1) as an input or output filter. For example, use
... |dd ... |tcio -ovVS 256 /dev/rct/c4t1d0
for output to a cartridge tape, or
tcio -ivS 256 /dev/rct/c4t1d0 |dd ... | ...
for input from a tape cartridge.'
HTH,
Vince
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тАО03-07-2002 12:23 AM
тАО03-07-2002 12:23 AM
Re: How to maximize compression on DAT24/HP-UX
DDS tape are rated as such
DDS 90M 2.6Gb native
DDS2 120M 4 Gb native
DDS3 125M 8 Gb native
DDS4 150M 12 Gb native
dd is not a real good backup tool
in relation to getting good compression.
There are others that are far more
efficient and compression with always
depend on how well the data can
be "squeezed". So if you have 12 Gb
tape as above the worst case should be
you will 12Gb onto a tape no matter what
tool is used.
-Michael
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тАО03-07-2002 04:28 AM
тАО03-07-2002 04:28 AM
Re: How to maximize compression on DAT24/HP-UX
-john