Re: [Nolug] Backing up linux

On Fri, 15 Feb 2008, Dustin Puryear wrote:

> RAID5 is okay so long as you aren't trying to backup a huge number of hosts
> at the same time due to RAID5's inherit performance issues. For a small to
> medium sized network my guess is you would be okay.

I concur. The RAID5 performance 'issues' are mostly a marketing ploy to
get us to RAID10 and buy more drives. :) On a single controller/bus with
4 or more drives, you'll saturate the PCI bus way before the SCSI bus.
With faster processors and some cache, this gives your controller plenty
of time to calculate and write the parity 'performance hit' of RAID5 while
waiting for the PCI bus to catch up. If your controller is PCIe, then the
bottleneck moves to the network. Unless you're running 10gb to the server.
:)

ray

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Ray DeJean  				       	 http://www.r-a-y.org
Systems Engineer                    Southeastern Louisiana University
IBM Certified Specialist  	      AIX Administration, AIX Support
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