>>>>> On Thu, 10 Jul 2008 13:10:31 +0200 (CEST), Jesper Krogh said:
>
> Hi.
>
> I've just hardware upgraded my bacula-server to a machine with 48GB ram.
> I've allocated at most 35GB to a "tmpfs" as spooling
> tmpfs /z/bacula-spool tmpfs size=35g 0 0
>
> And performance seems to be excellent on this filesystem (2 x LTO3 attached):
> jk@bacula:/z/bacula-spool$ sudo dd
> if=bacula-sd.data.16716.Hal_Daily.2008-07-09_23.58.15.LTO3-0.spool
> bs=64512 of=/dev/null
> 124007+1 records in
> 124007+1 records out
> 7999943571 bytes (8,0 GB) copied, 4,93783 s, 1,6 GB/s
>
> But my backup de-spooling speed sucks (at best):
> 10-Jul 11:31 bacula-sd JobId 16716: Despooling elapsed time = 03:06:23,
> Transfer rate = 715.3 K bytes/second
> 10-Jul 11:31 bacula-sd JobId 16716: Spooling data again ...
> 10-Jul 11:34 bacula-sd JobId 16716: User specified spool size reached.
> 10-Jul 11:34 bacula-sd JobId 16716: Writing spooled data to Volume.
> Despooling 8,000,008,095 bytes ...
>
> Note . .. in the first 4-5 incremental jobs I actually go ~80MB/s on it, so
> it has just degradede over night.
>
> Any suggestions?
Is the drive shoe-shining?
What does iostat show about the devices during despooling?
Have you tested the performance of tar writing to a tape from the tmpfs?
__Martin
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