Foo wrote:
> Hi,
>
> I'm doing a backup on a Debian Etch server which runs a network/time
> critical app at -20 niceness, but even with nice -n19 bacula-fd still
> causes glitches (packetloss).
>
> They seem to happen when the backup starts and ends, during the backup
> (doing 20-23 MB/s) there is no problem. An incremental backup that takes 5
> seconds still causes a glitch, although much smaller. Doing an 'estimate
> job=servername' via bconsole causes no glitch, but this is probably due to
> caching after the backup (returns immediately with the correct answer).
> This makes me think it is disk IO related (2x15K rpm SAS drives in RAID1
> on Dell Perc/5i - backup goes to other disk array over Gb Ethernet/Fiber).
>
> Is there a way to solve this on the Bacula side? The server is normally
> using only a few percent CPU, with bacula-fd going up to 15-25% at most,
> it's scheduling, or some disk related holdup that seems to be the problem.

If you suspect disk I/O may be a sticking point, look at using "ionice".
Works in much the same way as "nice", but for limiting I/O rather than
cpu.

You could also look at using iotop and iftop to check disk and network
throughtput at the problem times to see what is going on.
-- 
Mike Holden

http://www.by-ang.com - the place to shop for all manner of hand crafted
items, including Jewellery, Greetings Cards and Gifts




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