topic Re: What block size should be set ?? in Servers - General

What block size should be set ??

xam — Tue, 06 Jul 2004 04:10:27 GMT

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

Re: What block size should be set ??

Martin Balaj — Wed, 07 Jul 2004 01:38:06 GMT

I think 64K is optimal for you .

Re: What block size should be set ??

xam — Wed, 07 Jul 2004 01:46:33 GMT

Why 64? not 128? 192? 256?

Any formula to calculate? or by gusses?

thanks

Re: What block size should be set ??

Martin Balaj — Wed, 07 Jul 2004 02:20:22 GMT

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 .

Re: What block size should be set ??

xam — Wed, 07 Jul 2004 03:14:57 GMT

That mean even 128 or 256 are suitable?

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

: )

Re: What block size should be set ??

Martin Balaj — Wed, 07 Jul 2004 03:50:25 GMT

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

Re: What block size should be set ??

xam — Wed, 07 Jul 2004 04:06:08 GMT

ar....

anyway, thanks for your information

Re: What block size should be set ??

Thomas Bianco — Wed, 07 Jul 2004 16:36:15 GMT

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.

Re: What block size should be set ??

xam — Thu, 08 Jul 2004 00:20:48 GMT

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!