Slow Network Perfomance (NW6SP4/DS8.7.3/NSS(all vols)/6 Gig RAM/Gig Nics)

I have a tuning issue that I think may relate to either of the following 3 things:  memory, raided(block size), and gig nics.

When I copy files to any client whether using Native file(CIFS) or using the Novell client(s), the transfers start out fast but progressively slow down.  I can get a good transfer speed for about 10 secs. then it gets slower.  This will be the same for the backups as well.  Is there any tuning that can be done to improve the performance?


System:

Dell PE2600(Dual-3.0GHzXeon/Raid 1(SYS) and Raid 5 (Vols)-Block size 64kb/6 Gig RAM
All vols are NSS(block size 4kb)
4-Intel Pro/1000 MT in AD team mode with VLANS(latest driver from SP4)
Veritas Backup Exec 9.0 with current SP's and Agents(Backup server is on a W2k3 server)

Copy of configs.

Maximum Directory Cache Buffers = 150000
Minimum Directory Cache Buffers = 500
Maximum Number Of Internal Directory Handles = 500
Maximum Number Of Directory Handles = 500
Open Callback Timeout = 29.7 seconds
Maximum Record Locks Per Connection = 500
Maximum File Locks Per Connection = 2500
Maximum Record Locks = 20000
Maximum File Locks = 200000
Maximum Rights Vector Entry Pool = 128
Read Ahead Enabled = ON
Read Ahead LRU Sitting Time Threshold = 10 seconds
Minimum File Cache Buffers = 1000
Maximum Concurrent Disk Cache Writes = 750
Dirty Disk Cache Delay Time = 0.5 seconds
Minimum File Cache Report Threshold = 20
Maximum Concurrent opens per file and connection = 10000

 Novell Storage Services              *
****************************************

Emulate Classic NetWare Directory Quotas = OFF
NSS Work To Do Count = 75
NSS Maximum Cache Balance Buffers Per Session = 700000
NSS Cache Balance Timer = 30
NSS Cache Balance Percent = 75
NSS Cache Balance Enable = ON
NSS Buffer Flush Timer = 300
NSS Minimum OS Cache Buffers = 500000
NSS Minimum Cache Buffers = 500000
NSS File Flush Timer = 10
NSS Closed File Cache Size = 50000
NSS Open File Hash Shift = 17
NSS Auth Cache Size = 1024
NSS ASCII Name Cache Enable = ON
NSS Name Cache Enable = ON
NSS Name Cache Size = 10000
NSS Low Volume Space Alerts = ON
NSS Low Volume Space Warning Reset Threshold = 15
NSS Low Volume Space Warning Threshold = 10


****************************************
* Disk                                 *
****************************************

Auto scan for devices = ON
Auto load of CDM modules = ON
Sequential Elevator Depth = 8
Enable IO Handicap Attribute = OFF
Mirrored Devices Are Out Of Sync Message Frequency = 28
Remirror Block Size = 1
Concurrent Remirror Requests = 32
Ignore Partition Ownership = OFF
Ignore Disk Geometry = OFF
Multi-path Support = OFF
Enable Hardware Write Back = ON
Enable Disk Read After Write Verify = OFF


****************************************
* Common File System                   *
****************************************

Maximum Transactions = 10000
Maximum Concurrent Directory Cache Writes = 500
Immediate Purge Of Deleted Files = ON
Compression Daily Check Stop Hour = 6
Compression Daily Check Starting Hour = 0
Minimum Compression Percentage Gain = 20
Enable File Compression = OFF
Maximum Concurrent Compressions = 2
Convert Compressed To Uncompressed Option = 1
Decompress Percent Disk Space Free To Allow Commit = 10
Decompress Free Space Warning Interval = 31 minutes 18.5 seconds
Deleted Files Compression Option = 1
Days Untouched Before Compression = 14



Thanks for any help or ideas.
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