On Wed, Nov 05, 2008 at 02:48:20PM +0100, Ulrich Leodolter wrote:
> On Wed, 2008-11-05 at 13:34 +0200, Pasi Kärkkäinen wrote:
> > On Wed, Nov 05, 2008 at 11:12:01AM +0100, Ulrich Leodolter wrote:
> > > Hello,
> > >
> > > Problem:
> > >
> > > Settings like (documented in the Manual)
> > >
> > > Minimum block size = 64K
> > > Maximum block size = 200K
> > >
> > > do not work. Both are defined as size_pint32.
> > > multipliers like K M are not allowed.
> > > don't know if this is intended,
> > > maybe documentation just a little outdated.
> > >
> > >
> > > Question:
> > >
> > > Can i expect performance improvements (especially for
> > > Copy/Migrate Disk to Tape jobs) by by increasing
> > > "Maximum block size" on File devices in bacula-sd.conf ???
> > >
> > > Device {
> > > Name = FileStorage
> > > Media Type = File
> > > Archive Device = /disk0/bacula/files
> > > LabelMedia = yes;
> > > Random Access = Yes;
> > > Requires Mount = No;
> > > AutomaticMount = yes;
> > > RemovableMedia = no;
> > > AlwaysOpen = no;
> > > MaximumBlockSize = 1048576; # 1M
> > > }
> > >
> >
> > I think it should make difference at least with tape drives..
> >
> > You can measure the difference with dd:
> >
> > dd if=/dev/null of=/dev/tape bs=<try_different_block_sizes_here>
> >
> > 4k, 64k, 256k, 1MB, 4MB etc.
>
> Hello,
>
> I dont think raw performance is bad, as u can see below
> (exeption is 4k block size on tape,
> hopfully bacula does not use it :-)
>
> Maybe i should set
>
> Minimum Block Size = 4194304
>
> on both devices (Tape, File)
> This should reduce the number of block read/writes communication
> by a factor of 64.
>
> Will try it tonight, unless u give me a very good hint how to
> optimize ;-)
>
Hi!
Did you figure out 'best' performance settings for these disk-to-tape copy
jobs?
-- Pasi
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