On 12/08/10, Mike Hanby (mhanby AT uab DOT edu) wrote:
> I'm curious whether others with the PV-124T with LTO4 are using
> hardware or software compression.
> 
> I am testing a new Bacula deployment with one of these autoloaders /
> drives and haven't found a good suggestion as to which type of
> compression to go with.

My setup is a single machine with attached storage and tape drive.

I think it depends on how big your backups are and what sort of
compression you are looking for. On my fast server (8 core Xeon
E5520/2267MHz) it halves the speed of the the read off disk when using
software compression (it uses most of the CPU on one core to do the
compression).

This was a useful mailing list thread:
http://old.nabble.com/LTO:-hardware-vs.-software-compression-td15609768.html

I have hardware compression on and I get around 100MB/s throughput to
the tape device on a SAS card, and manage about 1.1TB on an LT04 tap.

I'd be interested to hear other thoughts on this.

Rory

-- 
Rory Campbell-Lange
rory AT campbell-lange DOT net

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