strange performance dip shown by iozone

[Gary Stanley]

Here's some knobs to try, ie;

RAID5:  Write Back Cache, Normal Read Ahead, and Direct I/O
RAID1:  Write Through Cache, Normal Read Ahead, and Direct I/O

That picked up my write speeds just enough so it wasn't nearly as bad 
writing as reading.

At 02:27 PM 2/20/2004, you wrote:
>On Feb 20, 2004, at 11:47 AM, mi+mx at aldan.algebra.com wrote:
>>Also, is the RAID5 writing speed supposed to be _so much_ worse, than
>>that of a single disk?
>
>it's normal for RAID-5 write performance to be slower than that of a bare 
>drive.  RAID filesystems involve tradeoffs between cost, performance, and 
>reliability.  RAID-5 maximizes cost and reliability at the expense of 
>performance....
>
>--
>-Chuck
>
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