John Drescher schrieb:
>>> I
>>> have not seen a cpu that can do more than 20 MB/s. I know my 2.83GHz
>>> core2 quad is no way as fast as my LTO2 tape drive when it comes to
>>> compression.
>> there is a multi-threading version of bzip2 - but I have no idea whether
>> bacula will be able to handle bzip2
>>
> This is pbzip2, I use it for a custom build process with gentoo. I am
> not sure how hard it would be to add this to bacula. 

Our bottleneck is the network. For that I made a test with this 
compression tool while the servers where on their daily job.

It seems the multi-threading bzip2 is compressing round about 50 percent 
more data at the same time than bacula shows for the average 
transferrate of the uncompressed data.

But I think for a significant benchmark I have to measure the average 
transferrate of the whole nightly  backup process including the 
compression step.

-- 
Ralf Brinkmann

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