On Wed, 25 Feb 2004 12:20:14 +0000, Davina Treiber <Treiber AT HOTPOP DOT COM>
wrote:

>Staudenmaier, Thomas (ZKD) wrote:
>> Hello all,
>>
>> I wonder if a change in the compression settings (SW and/or HW) renders
my
>> backups invalid.
>> More specifically:
>>
>> All my client backups run with the compressasm directive. I now want to
>> remove this directive. Is it possible to restore the backups made with
>> compressasm to the client when compressasm is removed?
>>
>> Is it possible to restore a backup made on a tape drive with HW
compression
>> enabled from a tape drive where HW compression is disabled or vice versa?
>>
>
>Yes it's possible. All this will work.
>

I must admit I havn't tested any of these but whilst I can see Legato
handling software compression/decompression, I would have thought that
hardware compression could only be dealt with by the hardware. So I'd say
yes for software both ways and for for reading a non-compressed tape
(assumes that all hardware will have a non compress mode) and no for
restoring a hardware compressed tape on a drive without the
compression/decompression hardware.

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