Hi,
i need some tips for a backup-server.
On a new backup-server i reach a backup-speed to an LTO-4 drive of
70MB/s only.
Here the config:
bacula 5.0.3 self compiled on debian squeeze 32bit OpenVZ-vm (Proxmox as
virtualisation platform).
neo200s jukebox (1 lto-4 SAS-drive) connected via a LSI SAS3801 Controller.
The host has 8 GB Ram and the backup-vm (OpenVZ container) can use 3 GB
of them.
The CPU is a AMD 945 (quad 3GHz) and bacula-sd has round 20% cpu usage.
The spooldisk is an Intel X25E SSD as writethrough disk on an Areca 1222
controller.
When i copy real data (a big tarfile) with dd to the LTO-4-Drive, i got
round 120MB/s - thats ok.
The bacula-speed is also round 70MB/s when i don't use the spool-disk
(the client stucks at 70% networkusage - with spooldisk up to 90% are
reached).
I tried to move the mysql-files also to the SSD, but this changed nothing.
First i start with a 256k blocksize, but with dd i got with 1024k blocks
slightly better results, so i use this value also with bacula - but
there are no real changes.
This is my bacula-sd entry:
Device {
Name = NEO200s-Drive1
Drive Index = 0
Media Type = LTO4
Archive Device = /dev/nst0
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
Maximum File Size = 5GB
Maximum Spool Size = 55g
Maximum Job Spool Size = 20g
Maximum Block Size = 1024k
Maximum Network Buffer Size = 2097152
Spool Directory = /spool/drive1
Changer Command = "/opt/bacula/bin/mtx-changer %c %o %S %a %d"
AutoChanger = yes
Alert Command = "sh -c 'smartctl -H -l error %c'"
}
Are there any tuning values?
Can i expect with 64bit a better flow-rate? But with dd i reached the
120MB/s...
I would be glad to have a explanation.
Best regards
Udo
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