NFS Performance: Weirder And Weirder

[Mehmet Erol Sanliturk]

On Sat, Mar 16, 2013 at 3:07 PM, Tim Daneliuk <tundra at tundraware.com> wrote:

> On 03/16/2013 04:20 PM, Mehmet Erol Sanliturk wrote:
>
>>
>>
>>
>
>> With respect to your mount points : /usr1 is spanning TWO different
>> partitions :
>>
>> /dev/ad4s1f    390G    127G    231G    35%    /usr1
>> /dev/ad6s1d    902G    710G    120G    86%    /usr1/BKU
>>
>>
>> because /usr1/BKU is a sub-directory of  /usr1 .
>>
>>
>> If you create a new directory , for example /usr2 , and /usr2/BKU , and
>> using this new separate directory for sharing , such as :
>>
>> /dev/ad6s1d    902G    710G    120G    86%    /usr2/BKU
>>
>> and
>>
>>    machine:/usr2/BKU     /BKU     nfs   rw,soft,intr          0  0
>>
>>
>>   will it make difference ?
>>
>>
>> Mehmet Erol Sanliturk
>>
>
>
> I just tried this and it made no difference.  The same file copied onto
> the NFS mount on /usr1/shared takes about 20x as long when coppied
> on to /usr[1|2]/BKU.
>
>
>
> --
> ------------------------------**------------------------------**
> ----------------
> Tim Daneliuk     tundra at tundraware.com
> PGP Key:         http://www.tundraware.com/PGP/
>
>

Michael  W. Lucas in Absolute FeeBSD , 2nd Edition ,  ( ISBN :
978-1-59327-151-0 ) ,
is suggesting the following ( p. 248 ) :

In client ( mount , or , fstab ) , use options ( -o tcp , intr , soft ,
-w=32768 , -r=32768 )

tcp option will request a TCP mount instead of UDP mount , because FreeBSD
NFS defaults to running over UDF .

This subject may be another check point .


Mehmet Erol Sanliturk