Matthias Hoys wrote:
>>>What's wrong with using RAID 5?
>>
>>Very slow writes.
>>
>>Oracle, for years, has advised against RAID5 in most situations. The
>>only hardware with RAID5 performance equivalent to RAID 0+1 is Apple's.
>>--
>>Daniel A. Morgan
>>http://www.psoug.org
>>damorgan_at_x.washington.edu
>>(replace x with u to respond)
>
>
> And the RAID-S of EMC Symmetrix ?
Single XOR engine so it suffers like the rest ... one XOR engine is
doing parity reads AND parity writes. And if you lose a drive ...
you immediately task it with the rebuild too.
--
Daniel A. Morgan
http://www.psoug.org
damorgan_at_x.washington.edu
(replace x with u to respond)
Received on Fri Dec 02 2005 - 17:51:39 CST
