Hi and welcome. I'm also new to using Bacula, but hopefully can offer
some usefull info :-)
Tape Capacity:
As you have seen LTO-1 tapes have an uncompressed capacity of 100GB,
due to bacula overhead, you should see no less then slightly under the
100GB on each cartrage. I have seen traffic indicating that any write
error is treated as EOT.... Question to the group, are there any
failures from write(2) that do not show up in the system logs? How old
are these cartrages, is it possible that they have deterated?
Run the btape tests on a set of these cartrages, use the "full" command in
btape, do a multitape test, record the output.
btape will show both the number of bytes written and the speed.
Backup throughput:
While 6MB/s is slow for LTO-1, one of the biggest things that I have
seen affect throughput is the rate that the data can be pulled from the
source disks. My own system can serve up data at about 15MB/s, not even
close to enough to keep the LTO-3 drive happy that I am using.
If you have not already done so, set up a spool disk, I use a dedicated
mirrored pair of SATA drives and am able to see speeds to tape of about
45MB/s. While a spool area will not reduce the total time of the backup
job, may even increase it, it will allow the streaming of data to the
drive at the fastest possible speed and reduce "shoe shining" as much as
possible and thus wear and tear on the tape and drive parts.
Hope the above helps.
Ed M.
On Mon, 30 Nov 2009, Jens Froehlich wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi bacula-users,
>
> I has a problem with my Bacula (3.0.2) installation on OpenSuSE 11.1
> (32Bit). The LTO-1 tapes are described only a half, nevertheless, it
> should fit 100 GB on it? I already succeed different values of the
> parametres " minimum block size" and "maximum blocksize" tested,
> unfortunately. If I the tapes with tar describe I reach 100 GB. I also
> find the writing speed with 6 MB/S a little bit slow?
>
> - ----------------------------------------------------------------------
> Pool: DailyTAPE
>
> DailyTAPE-0001 | Full | 1 | 54,780,100,608 | 1 |
> 518,400 | 1 | 1 | 1 | LTO-1
>
> DailyTAPE-0002 | Full | 1 | 53,212,479,488 | 1 |
> 518,400 | 1 | 2 | 1 | LTO-1
>
> .....
>
> DailyTAPE-0010 | Append | 1 | 131,072 | 0 |
> 518,400 | 1 | 10 | 1 | LTO-1
> - ----------------------------------------------------------------------
>
> What must I do, the Bacula the tapes with at least 90 - 95 GB describes?
> Can somebody help me here?
>
> By Jens
>
>
>
> Sorry for my bad English :-(
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> WToAoL1u9bUFpCc1EDIdFJFwdEKq/Wk+
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>
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