NAS

[Jakob Oestergaard]

On Fri, Jul 05, 2002 at 09:54:29AM -0600, Maurice Hilarius wrote:
..
> 
> It scales about evenly with the data rate. There is no such thing as a free 
> lunch. You move twice as much data, your CPU usage goes up too.
> Using bonnie++ on a RAID5 of 16 disks, when doing the sequential block 
> write part of the test CPU use goes to around 40% ( of one CPU).
> Fortunately the dual Athlon boards are inexpensive, so we use a Tyan dual, 
> and that means we have a CPU that can be dedicated to disk I/O and one for 
> NFS if needed, with a very minimal cost.

I wonder what your CPU load would be if you did not use RAID.

The 40% load is shared with some fraction taken by IDE and block I/O
layers, and some other fraction taken by RAID parity calculations.

Have you tried ?

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................................................................
:   jakob at unthought.net   : And I see the elder races,         :
:.........................: putrid forms of man                :
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