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

------------------------------------------------------------------------------
Start uncovering the many advantages of virtual appliances
and start using them to simplify application deployment and
accelerate your shift to cloud computing.
http://p.sf.net/sfu/novell-sfdev2dev
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users