Re: DDS3 Tape drive not compressing?
From: Adam Skeggs (fun_at_optusnet.com.au)
Date: 10/26/05
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Date: Wed, 26 Oct 2005 15:20:57 +1000
Adam Skeggs wrote:
> Hi,
>
> I have a HPUX 11.11 box with a C1537A tape drive which is I believe
> DDSIII. Trouble is I can't see that hardware compresssion is working.
>
> Using omniback the media look like DDSIII as the capacity is about 12Gb:
> $omnimm -media_info 581490 -detail
> ...
> Total blocks : 11743616
> (or is this the compressed capacity being reported? No that doesn't make
> much sense)
>
>
> Trouble is when I write 12Gb (added up totals from bdf) it's too much -
> thus there is no compression going on it seems.
>
> I am using the compression device: /dev/rmt/c1t0d0BEST which should be
> the right one.
>
> So I am a bit stumped.
>
> Any clues?
> Thanks,
> Adam.
>
>
Well now, using tar I can write about 20Gb compared to 12Gb using
Omniback with the same device file. Need to check a bit more...
Adam.
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