Hello,
My Hardware:
Blade Center H, with 8 blades LS21 (1 AMD Opteron 2.4GHz, 6 GB ram)
The data comes from a SAN DS4700 (Fiber channel 4 Gb/s).
My tape library is a IBM TS3100 using tapes LTO-3 connected via fiber
channel.
My Software:
OS: Red Hat Enterprise Linux ES release 4.
I'm using bacula-2.4.3
I've started with bacula 2.2.8 six months ago, making backups on disk. Then
I made some test with the tape backup, following "Testing Your Tape Drive
With Bacula", getting excellent BW. But then I upgraded to bacula 2.4.3 and
somehow I ended misconfiguring my tape unit.
Now, backing up 15MB from the SAN to the tape takes almost 8min. My tape
BW is just 33.0 KB/s. I tried backing up local data with the same BW.
Then, I'd go back to the basic tests and discovered that the tape unit is
working slow even without bacula. Example:
# time dd if=/dev/sda of=/dev/IBMtape0 bs=1M count=100
takes 3min (572 KB/s). Changing bs=64K doesn't make too much difference.
I get equivalent BW using tar. So, it seems to be a tape unit problem,
but then I ran the IBM test program 'itdt' and got these numbers:
Block Size Data Size Elapsed Data Rate
(KB) (MB) Time (s) (MB/s)
+-----------+-----------+-----------+-----------+
| 512 | 41961 | 245.728 | 170.764 |
| 256 | 41961 | 242.377 | 173.125 |
| 128 | 41961 | 259.317 | 161.815 |
| 64 | 41961 | 293.884 | 142.783 |
| 32 | 41961 | 354.081 | 118.508 |
| 16 | 41961 | 484.687 | 86.5746 |
| 8 | 41961 | 746.556 | 56.2069 |
+-----------+-----------+-----------+-----------+
So, the tape unit seems to be OK, after all.
My question is: is there a parameter in bacuala that allow me improve the
BW of my tape unit?
My actual configuration looks like this:
bacula-sd.conf:
==============
[...]
Device {
Name = TS3100
Archive Device = /dev/IBMtape0
Device Type = Tape
Media Type = TS3100
AutoChanger = yes
AlwaysOpen = yes
Removable Media = yes
Random Access = no
Requires Mount = no
Hardware End of Medium = no
Fast Forward Space File = no
BSF at EOM = yes
Two EOF = yes
#Offline on Unmount = yes
Drive Index = 0
Maximum Spool Size = 200100100100
Maximum Job Spool Size = 200100100100
Spool Directory = /reduc/var/bak/general/spool
}
Any ideas?
Thanks in advance.
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