Hello Jose,
On 22 Jan 2007 at 05:12:12 -0800, Jose Molina wrote:
> Bacula 1.38.11 on FreeBSD 6, and we're using as a library an HP MSL 2024
> with a HP LTO3 Drive.
I am also using freebsd 6.1, bacula 1.38.11_1, and a 24 slot LTO3 tape
changer from HP (HP Storageworks MSL2024). I have not experienced the
issues you mention. Here are my entries from bacula-sd.conf:
Autochanger {
Name = MSL2024
Device = LTO3-drive
Changer Command = "/usr/local/sbin/chio-bacula %c %o %S %a %d"
Changer Device = /dev/ch0
}
Device {
Name = LTO3-drive
Drive Index = 0
Media Type = LTO3
Archive Device = /dev/nsa0
Device Type = Tape
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
AutoChanger = yes
Offline On Unmount = no
Hardware End of Medium = no
BSF at EOM = yes
Backward Space Record = no
Fast Forward Space File = no
TWO EOF = yes
Maximum Network Buffer Size = 65536
Spool Directory = /spool/tape
}
I had to adjust the chio-bacula script to use the barcode reader, to
offline before unload, repair inverted logic in the loaded aspect, and
adjust the slots logic so the script would work for me. It takes me 16.5
hours to dump 900 gigabytes (fill 2.2 LTO3 tapes) of compressed data from
32 machines to tape. Here is one of my daily pools, adjusted for width
constraints.
Pool: FriTapePool
+--+--------+-------+---------------+----+----+-----+-----------+
|id|vol name|volstat|volbytes | v f|slot|media|lastwritten|
+--+--------+-------+---------------+----+----+-----+-----------+
|24|AC5760L3|Full |407,196,762,058| 408| 1 |LTO3 | 2007-01-20|
|25|AC5761L3|Full |406,973,753,857| 408| 2 |LTO3 | 2007-01-20|
|26|AC5762L3|Append | 93,281,786,206| 94| 3 |LTO3 | 2007-01-20|
|27|AC5763L3|Append | 1| 0| 4 |LTO3 | |
+--+--------+-------+---------------+----+----+-----+-----------+
While that averages about 15.25 MB/s, keep in mind that 32 servers are
compressing data and then sending it to bacula all at the same time.
Testing showed about an hour increase per server with compression off.
Two thirds of the servers achieve compression rates of 50% to 70% while
the other third see about 20% - 30%. I need to take daily backups offsite
and the compression only helps. When I move to encryption, I won't
require more tapes for a daily backup because encrypted data should not
compress. This was all for testing bacula. I have to add 150 more
machines to the mix, each with 25 to 75 GB of data.
Adam
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