Luc Lalonde wrote:
>
> Hey folks,
>
> I've been using Amanda on my network for sometime now and think that
> it's really a great distributed backup system.
>
> However, I'd like to create a "Monthly" profile to complement my
> "Daily" profile to do full backups of everything once a month.
> I just have one problem in that I don't think that the "tapetype"
> program calculated the capacity of my tapes with hardware compression.
> Here's the result that I got (I posted it on the FAQ-O-MATIC):
>
> define tapetype Maxell-DDS4-Hardware-Compress {
> comment "Maxell HS-4/150s DDS-4 with hardware compression"
> # data provided by Luc Lalonde <[EMAIL PROTECTED]>
> length 16985 mbytes
> filemark 400 kbytes
> speed 1579 kps
> }
>
> It seems to me that the length should be between 30 and 40 gigs with
> hardware compression. I checked to see
> if the compression was on before the calculation with the command "mt -f
> /dev/nst0 datcomp" and I got an answer
> that it was indeed on.
>
Actually, you missed the point.
tapetype can not estimate how much data you can fit with the hw
compression on.
It writes random data in order to estimate so-called "native" capacity.
Basically it is the same if
you write software compressed data to the tape.
In case you have the compression on, the result will be less than it was
expected.
So turn off the compression and re-run tapetype.
> What am I missing here (I'm using linux-2.2.18 on a PentiumIII with an
> HP SureStore DAT40) ?
>
> Cheers.
>
> --
> Luc Lalonde, Responsable du reseau GIREF
>
> Telephone: (418) 656-2131 poste 6623
> Courriel: [EMAIL PROTECTED]
--
Yuri Pismerov, TUCOWS.COM INC. (416) 535-0123 ext. 1352
S/MIME Cryptographic Signature
