From: "Heitor Faria" <heitor AT bacula.com DOT br>
To: "Randy Katz" <rkatz AT simplicityhosting DOT com>
Cc: "Bacula-users AT lists.sourceforge DOT net" <bacula-users AT lists.sourceforge DOT net>
Sent: Friday, February 5, 2016 12:11:26 AM
Subject: Re: [Bacula-users] Maximum Bandwidth Per Job Question

> I am having the issue that servers that have multiple KVM VM's that are
> being backed up

> are throttling the servers resources and bringing it to a crawl.

I'm assuming you are referring to the machine CPU high usage bottleneck.

Are you using compression? If yes NEVER use a higher than 6 gzip level and give a try to level 1 (eg) or even LZO.

If your backed data is already compressed you will almost have no benefit of using this.

Using compression, GZIP, no level is set. Here is a a copy/paste from one of the recent backups:

  FD Files Written:       1,849,713
  SD Files Written:       1,849,713
  FD Bytes Written:       153,782,430,234 (153.7 GB)
  SD Bytes Written:       154,119,461,239 (154.1 GB)
  Rate:                   2005.4 KB/s
  Software Compression:   35.9% 1.6:1
  Snapshot/VSS:           no
  Encryption:             no

I am not sure if LZO is the answer in this case. According to a previous discussion it
may not be much different, performance wise.

Hello, Randy: GZIP levels (default is 6) do make a huge difference in CPU load. Also, make sure you are using 64 bits OS.

As for the question from Ana of when 
servers are not going to be used well it is already set for that time but there is never
really a time when servers should be very very slow or inactive. As for your suggestion
to buy another software 

I would never suggest that. If you are struggling with excessive work load you may consider buying better *hardware*.

I have been using Bacula for many years and have not had any
issues until recently due to increased activity and am asking the question about Maximum
Bandwidth and what settings folk are using as it appears to be only a bandwidth limit/throttle
and not a CPU issue.

I still think putting a cap on your backup performance is not the answer to what you want to achieve and an optimal value for Maximum Bandwidth does not exist since it relies on particular case scenarios. 

Regards,

--

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Heitor Medrado de Faria - LPIC-III | ITIL-F |  Bacula Systems Certified Administrator II

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