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тАО11-18-2002 12:39 AM
тАО11-18-2002 12:39 AM
Solved! Go to Solution.
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тАО11-18-2002 02:03 AM
тАО11-18-2002 02:03 AM
Re: How to disable hardware compression of Surestore DAT24x6 External
Eugeny
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тАО11-18-2002 05:47 PM
тАО11-18-2002 05:47 PM
Re: How to disable hardware compression of Surestore DAT24x6 External
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тАО11-19-2002 01:38 PM
тАО11-19-2002 01:38 PM
SolutionEugeny
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тАО11-30-2002 11:14 AM
тАО11-30-2002 11:14 AM
Re: How to disable hardware compression of Surestore DAT24x6 External
http://h20000.www2.hp.com/bc/docs/support/SupportManual/lpv37995/lpv37995.pdf
From my experience under Win2K if all 8 DIPs are ON the DLL Tape Tool indicates that the Hardware compression is OFF. As opposed to that, when the DIP 3 is OFF, the rest are ON, the hardware compression is indicated ON.
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тАО12-01-2002 05:30 PM
тАО12-01-2002 05:30 PM
Re: How to disable hardware compression of Surestore DAT24x6 External
1. The hardware compression issue is mainly the problem of Arcserve. Arcserve only provides limited support in this area. The hardware compression option is only available for single tape drive. (Not available for x6 / autoloader models)
2. Even there is a compression option to choose from, it is full of bugs. First, Arcserve does not allow change of compression mode if the tape is not BLANK, however, you just like to swap your original tape with a BLANK one, change the mode, and then swap back to your original tape, then you have change the mode you want. So basically this restriction is useless, and ridiculous.
3. No matter if you enable/ disable the hardware compression, when you start/ restart the tape engine, Arcserve will set the hardware compression to ON, regardless the default compression setting set by the DIP switches on the tape drive, unless you have DISABLED host control. Therefore, you can never maintain a job using software compression only unless you never reboots the server or disable host control.
4. The last part is about HP. The tape drive did not report the compression ratio and amount of remaining tape to Arcserve. Therefore you can never know whether a the tape drive has done a good job and whether there is enough space for small backups to append to existing tape.
Just hope that both Computer Associate and HP can do something to improve their programs and drives.