RAID performance

[Mike Woods]

Yui Sakazume wrote:

>Hello,
>
>I have installed FreeBSD-4.10 to NEC Express5800 120R.
>I attached LSI Logic MegaRAID SATA 150-6 with six SATA disks.
>And configure RAID 5 LUN.
>But, I/O prformance is poor(about 5MB/s).
>
>Is amr suitable for MegaRAID SATA 150-6 ?
>Please tell me newfs parameters if there is recommendation.
>  
>
Write operations on raid 5 take a massive performance hit, most 
controllers will try to compensate with caching
tricks but i suspect this could well be the cause of your problems.

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Mike Woods
IT Technician