Re: [Bacula-users] Backup speeds LTO2
2008-06-09 21:12:16
On Fri, 6 Jun 2008, Tobias Bartel wrote:
> Hallo,
>
> i added 50GB for spooling
> > Maximum Job Spool Size = 53687091200
>
> although a bit faster my last test run still did not come close to the speeds
> mentioned by others:
I'm not really surprised...
> > Software Compression: 27,9 %
Switch off software compression. This is a cpu sucker and slows things
down markedly.
LTO series have fairly efficient hardware compression and it's much faster
than software compression
> I double checked the connection and the 100MBit/s Link is performing as one
> could expect.
100Mb/s will give you a _MAXIMUM_ of 11MB/sec. When you take spooling
overhead (spool to disk, flush from disk) into account 5MB/s isn't a bad
throughput/
> Are 50GB for spooling not enough? Should i upgrade to GBit
> connection or is there anything else i could try?
50GB space is fine, as long as it is fast enough (have you benchmarked
it?) - a single dedicated hard disk is barely fast enough for spooling 1
LTO2 job and LTO3/4 can easily outrun a hard drive's sustained throughput.
Upgrading your networking will increase maximum network throughput to
something approaching what LTO can cope with.
Start looking at parts of the job:
What speed is Bacula reporting for spooling to disk?
What is Bacula reporting for the despooling speed?
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