What block size should be set ??

[xam]

My file server will serve about 40 clients. And each clients will get large file (30Mb) in all the time.

What stripe size should be set for the optimum performance? 64K? 128K? 192K?

(I am using 6400 array card)

Thanks

[Martin Balaj]

I think 64K is optimal for you .

[xam]

Why 64? not 128? 192? 256?

Any formula to calculate? or by gusses?


thanks

[Martin Balaj]

There isnt any calculation ,just meaning of using ,larger block sizes are good only for very big arrays with large databases an so on .Sorry for my english .

[xam]

That mean even 128 or 256 are suitable?

I am trying a way to find the best setting for my servers.


: )

[Martin Balaj]

You may use it ,but 30MB is not large file (or files)and therefore ,i think you have better performance with 64K .

[xam]

ar....

anyway, thanks for your information

[Thomas Bianco]

64 is almost always the perfect raid block size. why? because thats the size the os expects.

the only time you would create a larger block size would be if your going to use a raw database partition, like oracle or... well i can't think of any others, but i'm sure most enterprize databases use them.

[xam]

64K... I see.

is there any method to measuree the performance?

or only use silly method, start the time watch and copy a large file and then stop it?


ANy suggestion?

Thanks!