Hi,
I've been struggling with Bacula for a single backup installation for
almost 4 months now. Although installation and configuration are well
documented I'm still confused by two problems we can't get solved:
1. Even with brand new tapes, on two different tape drives, using
continuous cleaning cycles, the tapes that used to store between 11.5
and 13 GB uncompressed data on a windows machine only take about 8 GB
using bacula (same drive, same tapes).
Following the advice to switch off software compression when hardware
compression is enabled, we run tests with following results (always the
same fileset of 23 GB uncompressed data)
hw-compress sw-compress spool size data/tape total # of tapes used
on on 14 GB 8.2 GB 1.7
on off 23 GB 12.9 GB 1.8
so we use the installation with both sw and hw compression turned on, as
it gives us better performance and less tapes/backup.
Why is it impossible to store more then 8 GB on a 12/24GB tape. Again:
we ran the tests on multiple different drives (HP15xx and Sony
DDS3-drives).
2. Up to now a verify at level "VolumeToCatalog" always (!) brings up at
least one error of the type "Error: block.c:317 Volume data error at
3:2817! Block checksum mismatch in block=2817 len=64512: calc=8fe728a4
blk=bd217fe3" in the middle of the tape.
After that bacula dupms the whole remaining file list into an email
message of about 30MB in size.
- Is there any way to make Bacula stop to send the file list while keep
on sending email notifications ?
- How can it be, that a single error renders the whole tape of a backup
useless ? Why does bacula not continue to verify the other 80% of a
backup and tells something like "block error while reading ..., missing
files ...." ?
Thanks for any hints,
Carsten
The installation I'm talking about runs on a 2.0.36 Linux kernel with a
single Sony SCSI DDS3 tape drive (12GB uncompressed) inside a 8-slot
auto-changer (drive and changer are the only devices on the SCSI bus)
The team drive+changer work together as expected.
We run about ten other backup installations using commercial tools and
Amanda. So far, bacula was the one easiest to set up among the free
tools, but after 4 month of testing we haven't got single backup which
runs through and verifies without an error.
I know, that DDS is not the idal choice as we run some SLR, LTO and VXA
solutions, but for that particular case the tape drive has to be DDS3 as
the customer in question has a large library which only handles DDS and
MiniDV tapes.
--
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D-09603 Grossvoigtsberg
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Geschäftsführung: Carsten Ralle
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