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 maybe documentation just a little outdated.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 ;-)
BR
Ulrich
---++ Raw Tape Performance
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/dev/nst1 bs=4k count=256k
262144+0 records in
262144+0 records out
1073741824 bytes (1.1 GB) copied, 48.2057 seconds, 22.3 MB/s
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/dev/nst1 bs=64k count=64k
65536+0 records in
65536+0 records out
4294967296 bytes (4.3 GB) copied, 41.4204 seconds, 104 MB/s
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/dev/nst1 bs=256k count=16k
16384+0 records in
16384+0 records out
4294967296 bytes (4.3 GB) copied, 34.1308 seconds, 126 MB/s
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/dev/nst1 bs=1024k count=4k
4096+0 records in
4096+0 records out
4294967296 bytes (4.3 GB) copied, 32.3195 seconds, 133 MB
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/dev/nst1 bs=4096k count=4k
4096+0 records in
4096+0 records out
17179869184 bytes (17 GB) copied, 119.205 seconds, 144 MB/s
---++ Raw SATA Raid Performance
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/disk0/test.img bs=4k count=4096k
4194304+0 records in
4194304+0 records out
17179869184 bytes (17 GB) copied, 83.0424 seconds, 207 MB/s
[EMAIL PROTECTED] ~]# dd if=/dev/zero of=/disk0/test.img bs=64k count=256k
262144+0 records in
262144+0 records out
17179869184 bytes (17 GB) copied, 81.8973 seconds, 210 MB/s
>
> -- Pasi
--
Ulrich Leodolter <[EMAIL PROTECTED]>
OBVSG
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