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



>
> I got the biggest gain by changing "Maximum File Size" to 5 GB. How
> fast is the disk where you spool file is locatet?
>

Ok, I don't have that setting enabled but I could try it. Question:
how do you decide 5 GB is an optimal value for your LTO-4 tapes? what
value could I put for my LTO-5 tapes? I don't really understand what
should be the appropiate value for this directive.
I don't know how to tell you how speed is my local disk (spool
directory), but is this useful?


[root@qsrpsbk1 ~]# hdparm -t /dev/sda

/dev/sda:
Timing buffered disk reads: 370 MB in 3.01 seconds = 123.00 MB/sec


> 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)

It will take some time to run this test because of the low speed of
/dev/unrandom but I'll show you the results on my next message.

By the way, do I really need to change the buffer/block size at the
Storage configuration? What buffer/block size should I use?
>
>
> Ralf
>

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