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



On Thu, Apr 28, 2011 at 10:30 AM, John Drescher <drescherjm@xxxxxxxxx> wrote:
>> No, there are just a "normal" number of files from a shared folder of
>> my fileserver with spreadsheets, documents, images, PDFs, just
>> information of final users.
>>
>
> The performance problem is probably filesystem performance. A single
> hard drive will only hit 100 MB/s if you are baking up files that are
> a few hundred MB.
>
>
> --
> John M. Drescher
>

Hi:

How can I know where's the bottleneck? I'm using an ext4 filesystem.
Are these tests useful?

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

/dev/sda:
Timing buffered disk reads: 370 MB in 3.01 seconds = 122.89 MB/sec
[root@qsrpsbk1 ~]# hdparm -tT /dev/sda

/dev/sda:
Timing cached reads: 3770 MB in 2.00 seconds = 1885.16 MB/sec
Timing buffered disk reads: 370 MB in 3.00 seconds = 123.20 MB/sec

First I disabled 'signature=SHA1' at my Jobs and I gained little speed
of my backup (between 79 and 83 MB/s). Then I enabled Data Spooling
(so attribute spooling also is enabled) and my backups became slower
(between 36 and 45 MB/s).

All my tests were done running Full backups. The first large backups
were done without spooling and 4 TB of data, but my recent backups
were done with spooling enabled and 8 GB of data.

Would I need to modify settings of Buffer size in my Storage Daemon?
Is there any other reason for my slow backups? Are my backups really
slow or this speed is normal/good?

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