I guess this means I'll have to closely watch how many
backups it takes to fill a tape - the worst case being
the nominal capacity of the tape, i.e. 200 GB
uncompressed. I deployed Bacula web-gui yesterday,
it'll make this task easier.
I'm still puzzled, though, how BrightStor Enterprise
Backup 10.5 managed not only to estimate me how much
space was still available - it also told me the
compression ratio of the backup! I used to get 1.5:1
on Windows file servers and anything from 4:1 to 6:1
(!) on Oracle 8i. That was using an IBM 3583 LTO
Ultrium I tape library on Windows 2000 Advanced
Server. Regards,
Georger
--- Arno Lehmann <[EMAIL PROTECTED]> escreveu:
> Hmm. According to the documents I read, LOG SENSE
> itself is optional,
> and page 0x31 is vendor specific (according to SPC-3
> draft, and SSC-3
> draft, and assuming I understood the text
> correctly). Instead, some data
> is available in log page 0x0c, which is mandatory,
> but there they only
> talk about approximate values.
>
> Only seeing what the standard calls "native
> capacity" of a tape makes
> one aware of the problems when trying to determine
> tape capacity:
> "3.1.43 native capacity: The capacity assuming
> one-to-one compression
> (e.g., compression disabled), the medium is in good
> condition, and that
> the device recommended typical block size is used."
>
> Anyway, in typical scenarios, the only reliable way
> way of guessing tape
> capacity (or remaining capacity) is estimating based
> on individual data,
> i.e. using existing tapes with similar data on them
> as reference.
>
> Arno
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