DDS3 Tape drive not compressing?

• Previous message: Lars Bausch: "Re: changing contiguous strict allocation policy"
• Next in thread: Jan Gerrit Kootstra: "Re: DDS3 Tape drive not compressing?"
• Reply: Jan Gerrit Kootstra: "Re: DDS3 Tape drive not compressing?"
• Reply: Frank Slootweg: "Re: DDS3 Tape drive not compressing?"
• Reply: Adam Skeggs: "Re: DDS3 Tape drive not compressing?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Date: Mon, 24 Oct 2005 09:37:02 +1000

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.

• Previous message: Lars Bausch: "Re: changing contiguous strict allocation policy"
• Next in thread: Jan Gerrit Kootstra: "Re: DDS3 Tape drive not compressing?"
• Reply: Jan Gerrit Kootstra: "Re: DDS3 Tape drive not compressing?"
• Reply: Frank Slootweg: "Re: DDS3 Tape drive not compressing?"
• Reply: Adam Skeggs: "Re: DDS3 Tape drive not compressing?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]