fake raid vs software raid

[Dan Stromberg]

On Thu, 2005-06-23 at 12:09 +0200, Arjan van de Ven wrote:
> On Thu, Jun 23, 2005 at 03:33:41PM +1000, Brock Lessels wrote:
> > i am currently running dmraid on gentoo linux. the system uses a sata
> > sil3114 card with 4 drives running raid01 the only issue is that the
> > install takes alot of fiddling and i have 6 more machines to get up
> > and running.
> > 
> > firstly could anyone tell me if there is any performance issues using
> > software raid rather than the cards raid format?
> 
> the linux software raid is such that it should be able to get higher
> performance. the raid card formats all have a "deficiency" that is caused by
> them raiding a whole disk not a partition, and that causes some problems
> that in turn can lead to slower performance.

Why would RAID'ing an entire disk be a performance problem relative to
RAID'ing a partition (for example, a whole-disk partition, except for
the first block)?

Thanks!

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