Subject: Re: [Bacula-users] Speed of backups



Jason Voorhees schrieb:
> > I got the biggest gain by changing "Maximum File Size" to 5 GB. How
> > fast is the disk where you spool file is locatet?
> >
> > A different test would be to create a 10 GB file with data from
> > /dev/urandom in the spool directory and the write this file to tape
> > (eg. nst0). Note: this will overwrite your existing data on tape and
> > you might have to release the drive in bacula.
> >
> > dd if=/spoolfile-directory/testfile of=/dev/nst0 bs=xxxk (your bacula block
> > size)
> >
> >
> > Ralf
>
> Ok, I made this:
> [root@qsrpsbk1 spool]# dd if=/dev/urandom of=random.tst bs=1M count=10240
>
> [root@qsrpsbk1 spool]# dd if=random.tst of=/dev/st0 bs=2048k count=5000
> 5000+0 records in
> 5000+0 records out
> 10485760000 bytes (10 GB) copied, 160.232 s, 65.4 MB/s
>
> The block size of 2048k is the same I'm using at Bacula Storage Daemon
> configuration (Maximum Block Size = 2097152). Why the speed of dd was
> 65 MB/s when my Despooling speed is about ~80-90 MB/s?


This is too slow. Try a block size of 256k with dd, this is what I
use in bacula too. Or try different block sizes beginning by 64k to see
how the speed changes.

This are my SD settings.

Maximum File Size = 5G
Maximum Block Size = 262144
Maximum Network Buffer Size = 262144



> Well, these are my results of a bonnie++ test:
> ...
> Version 1.03e ------Sequential Output------ --Sequential Input-
> --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks-...

-

> Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
> %CP
> qsrpsbk1.qui 36200M 77100 96 108223 18 48701 7 77012 93 142733
> 8 681.7 0
> ------Sequential Create------ --------Random
> Create--------
> -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
> files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
> %CP
> 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++
> +++
> qsrpsbk1.mydomain.com,36200M,77100,96,108223,18,48701,7,77012,93,142733,8,681.7,0,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
>
>
> What do you think about these tests?



This disk is too slow for spooling. Even with LTO4 you need a drive
that is capable of stream the data with > 150 MB/s. I use a raid10
with 6 WD VelociRaptor drives.


Ralf



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