We are seeing very poor performance when using CIFS and I was wondering if there are any tips or whitepapers regarding CIFS tuning?

During our testing we are getting 15MB/sec using a custom in house application that writes data from a DB to the share.

I have not tested it using an IO load tool like vdBench yet, I just wanted to see if there was anything we should tune up front.

Celerra:

NS-G8 v5.6.50.2

Two 10GbE network interfaces configured in an LACP port-channel.

RAID-5 7+1, 15k FC-AL, V-Max backend storage.

Filesystem was create using the sym_std AVM pool (filesystem is striped across 8 LUN's, 32k blocksize.)

Dedupe - Disabled

Virtual provisioning - Disabled

Direct writes - Disabled

Prefetch - Enabled

CIFS Sync Write - Disabled

Host Environment:

Windows 2008 R2

16-cores, 256GB RAM

Dedicated 1GbE interface for Celerra interface.