> > On 30.11.06 15:44, Johannes Wiedersich wrote:
> > > What is debian's opinion about hardware/software raid?

> On Thursday, 30.11.2006 at 16:56 +0100, Matus UHLAR - fantomas wrote:
> > it highly depends on the hardware raid. The true hardware RAID with
> > hotspare, hotswap etc. support and with proper drivers (so you won't have to
> > boot into its bios to reconfigure it) will be much more reliable.
> > 
> > > On the other hand, performance will probably be better with a dedicated
> > > hardware raid controller.
> > 
> > it highly depends on the hardware raid. The true hardware RAID with XOR
> > counting and mirroring support will be much faster.

On 30.11.06 16:01, Dave Ewart wrote:
> Although it's worth pointing out that software RAID-*1* (one of the
> options under consideration) has almost no CPU overhead, and is often a
> good low-cost option.

I did not want to mention this, because:

- software RAID-1 has bus overhead (the same data have to be transferred
multiple times to multiple drives, so writing may be twice as slow)

- software RAID-1 has high CPU and bus overhead in case of resyncing after
disk outage (hw raid does that itself)

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