Re: Software RAID5 with 2.6.0-test

[mru@users.sourceforge.net (Måns Rullgård)]

Samuel Flory <sflory@rackable.com> writes:

>> What about the RAID controllers in the $400 category?  Surely, they
>> must be doing something better than the $50 fakeraid controllers.
>>
>
>    Yes, but follow this logic.
>
> 1)You are willing to devote 10% of 2Ghz xeon to software raid.
> 2)A $500+ controller has a 100Mhz proccessor.
>
>    Thus just from this you could guess that software raid has x2 as
>    many clock cycles availble to it.  It's even worse when you realize
>    the 2Ghz xeon is a better proccessor in many more ways than just
>    clock cycles.

How about this logic:

1) If the processor on the RAID controller can handle the full
bandwidth of the disks, it's fast enough.
2) If someone else does the 10% work, the CPU can do 10% more work.

-- 
Måns Rullgård
mru@users.sf.net