Thanks all for your prompt responses. It looks like much of the data we
are backing up are source and text files, so it is completely within
reason that these be highly compressable.
Furthermore, I did a full restore of a ~200GB fileset that spanned two
tapes and it worked perfectly well.
Thanks again for the help!
Mark
[EMAIL PROTECTED] wrote:
Hi everyone,
I've been running Bacula version 1.38.2 on a 6.0-STABLE FreeBSD system
with a Postgres (v7.4) backend for several months. The machine hosting
the director is connected to an Exabyte 221L tape library (via SCSI)
with an IBM LTO-2 drive, but we currently only have LTO-1 tapes.
With this setup (specifically, the LTO-1 tapes) I should be able to
store _at most_ 200GB of data per tape (100GB of storage times the
mythical 2x compression claimed by the hardware). Bacula reports,
however, that I am storing anywhere from 300 to 480 GB per tape. That
is, when I add up the nightly reports of how many sd bytes are written
before a tape gets changed out, or when I run "list volumes" from
bconsole and look at the "volbytes" column, both show well over the
expected 200GB of data being stored on a fresh tape. I have been
watching this for several months now and have noted this behavior
occuring on at least fifteen separate tapes.
If your data is highly compressible or you have some large sparse files this is
totally possbile. The hardware compresson 2x is no limit at all. It is just a
number
that the drive manufacturer claims will be the average and at least for me it is
generally way too high. With the medical images, I have to backup I get 1.2x to
1.5x
most of the time however there are times I get as much as 3.5x.
John
John
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