What is a good choice of sata-ii raid controller for freebsd?

Patrick M. Hausen hausen at punkt.de
Sun Feb 11 23:51:41 UTC 2007

Hi, all!

On Mon, Feb 12, 2007 at 09:40:18AM +1030, Daniel O'Connor wrote:
> On Monday 12 February 2007 00:34, Patrick M. Hausen wrote:
> > One guy that I happen to know, who was responsible for the database
> > backend servers of Germany's biggest web mail provider at the time,
> > ran extensive benchmarks. Result: for RAID 1, RAID 0 and RAID 1+0
> > there is no difference in "hardware RAID" vs. OS mirroring and
> > striping. He used Linux, but I'd bet a huge amount that his
> > findings can be transferred to arbitrary current operating systems.
> Software RAID won't help you if your primary disk gets an error in, say, the 
> second stage loader.

I don't really buy this "booting" arguement. What's the failure scenario
here? If the system is up and running, it will just keep humming along.
The SCSI or ATA layer is supposed to detach a failed drive and
geom will disable one part of the mirror.

You can react appropriately when you get the failure message.

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