On Tuesday, 20 March 2001 at 11:11:44 -0600, Michael C . Wu wrote:
> [Lengthy email, bear with me please, it is quite interesting.
> This box averages 30.0 load with no problems.]
>
> <snip>
>
> Average file size is about 4K. /home/bbsusers* is on a vinum
> stripe'd volume with 3 Ultra160 9G 10000RPM drives on sym0 at stripe
> size 256K, Greg: I know this should be a prime number,
No, there's no requirement for it to be a prime number. The only
problem is that with 32 MB cylinder groups and a power of two stripe
size and subdisk count, you end up with all the superblocks on one
subdisk, which is a performance issue. Choose the stripe size so that
the superblocks are roughly evenly distributed.
> can we safely use <150K stripe sizes?
Safely, yes. But as somebody else has observed, you are probably disk
I/O bound. Reducing the stripe size will tend to increase the disk
load, though probably not very much if your files are all 4 kB. I'd
go for something like 273 kB stripes.
Greg
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