Hi,
I use the regular Linux tape driver (st), not the IBMTape driver, for my TS3310
tape library.
Have you tried doing that?
Testing with dd and tar is a good idea, then move on to testing with btape.
Regards,
Alex
On Mon, 10 Nov 2008 09:35:52 -0430 (VET)
[EMAIL PROTECTED] wrote:
> 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.
--
Alex Chekholko
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