NFS Performance: Weirder And Weirder

Mehmet Erol Sanliturk m.e.sanliturk at
Sun Mar 17 04:56:11 UTC 2013

There is one more point to check :

>From your mount information , in the server , directories are on DIFFERENT
drives .

Assume one of the drives is  very "INTELLIGENT" to save power .

During local reading , due to reading speed , it may not go to "SLEEP" ,
but during network access , it may go to  sleep due to its exceeded waiting
time .

If this is the case , please stay away from INTELLIGENT drives in a server
: These are designed and produced by very IGNORANT entities .
For simple , personal applications , their latency may not be noticed very
much , but in a server , they can not be used .

Another point may be file sizes .

To check effect of file size , into the two different directories copy a
large ( for example , 5 GB , or a  4.n GB  .iso file ) and
transmit these same files from their directories to a single client  .

If directory structure makes a difference , assuming hardware parts and
client does not behave differently to these files ,
performance difference may be attributed to server side .

Mehmet Erol Sanliturk

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