[cifs-protocol] CIFS/NFS performance of netapp filer vs local dir

Lam Hoang lam at synplicity.com
Thu Mar 1 00:34:00 GMT 2007

What is your opinion (pros/cons)  on  OpenAFS filesystem ?

-----Original Message-----
From: Joseph Kuan [mailto:joe.kuan at itheon.com] 
Sent: Tuesday, February 27, 2007 5:03 AM
To: lam at synplicity.com; 'Chuck McIntyre'
Cc: cifs-protocol at cifs.org
Subject: Re: [cifs-protocol] CIFS/NFS performance of netapp filer vs local

As far as I know, CIFS is a wordy protocol the reason is because it is a 
protocol originally designed not for many purposes.

The main reason of poor network throughput because when you open a file, 
is not a simple open, read, and close. It sends lots of TRANS2 packets 
and the same file open and close several times before reading the whole 
files, lot of other weird network operations such as NTFS data stream 

For small files, you probably see 3-10 times more packets transferred 
across the wire than the NFS. I think the performance difference may 
also depending on what type of file you are trying to open. For big 
files, (my very wild guess) you may see the performance difference 
converging to certain factor which is still more than NFS.

The difference is even more when you open a network directory.

I am in the middle of the process documenting on this issue. Will let 
you know more details in near future (if you are interested).

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