ReadyNAS 4TB Slow Write Performance

My setup:
ReadyNAS Ultra 4, 2x1TB 7200rpm WD, 2x2TB 5400 WD, XRAID2:
Our NASes are different but maybe what I learned could help you a little.

RAIDiator 4.2.19
1Gbit, Full Duplex
MTU - 1500
DHCP - Automatic
IPv6 Assignment - Configure Automatically
Jumbo Frames off
Workgroup - "HOME" (same as my Win7 network)
No WINS
ReadyNAS not serving as DHCP
Standard File Protocols - CIFS and HTTP (auto selected and greyed out).  All others off
Streaming Services - Off
Discovery Services - UPnP on, Bonjour off
Enable Disk Write Cache - On
Disable Full Data Journaling - Off
Add-ons - None
Cat5 cable

WNDR3700 router:

• DHCP enabled


• IPv6 enabled


• Firmware: V1.0.7.98NA


• MTU: 1500


• UPnP: On


• Bandwidth Control: Off

Win7 x64, 4GB RAM, 7200RPM HDD, Intel Core i7-950
RealTek PCIe GBE Family Controller 8168 GigE NIC:

ARP Offload - Enabled
Auto Disable Gigabit - Disabled
Energy Efficient Ethernet - Enabled
Flow Control - Enabled
Green Ethernet - Enabled
Interrupt Moderation - Enabled
IPv4 Checksum Offload - Rx & Tx Enabled
Jumbo Frame - Disabled
Large Send Offload v2 (IPv4) - Enabled
Large Send Offload v2 (IPv6 - Enabled
Network Address - Not Present
NS Offload - Enabled
Priority & VLAN - Priority & VLAN Enabled
Receive Buffers - 512
Receive Side Scaling - Enabled
Shutdown Wake-On-Lan - Disabled
Speed & Duplex - 1.0 Gbps Full Duplex
TCP Checksum Offload (IPv4) - Tx & Rx Enabled
TCP Checksum Offload (IPv6) - Tx & Rx Enabled
Transmit Buffers - 128
UDP Checksum Offload (IPv4) - Tx & Rx Enabled
UDP Checksum Offload (IPv4) - Tx & Rx Enabled
Wake on Magic Packet - Disabled
Wake on Pattern Match - Disabled

I use LAN Speed Test v2.06 (http://www.totusoft.com...well worth the $5) to test my speeds. I then confirm them with drag-and-drop and with the speed measurement in GoodSync during a backup routine.

MBps - MegaBytes per second

Jumbo Frames off-- Write: 56 MBps Read: 98 MBps
Jumbo Frames on-- Write: 11 MBps Read: 86 MBps

Jumbo Frames does not work well with my NIC & ReadyNAS (even with a direction connection to the NAS). The WNDR3700 is supposed to be able to handle Jumbo Frames on the switch portion of the router.

With jumbo frames off, write speeds will peak and hold at around 62 MBps for the short run (5-10 minutes), but on long backup routines with mixed file sizes using GoodSync, typical average write speed is 55-56 MBps over an hour or two.

Slow copy speeds on Vista and Win7 are a much lamented problem that seems to be hit or miss:
http://mytechweblog.blogspot.com/2007/0 ... is_05.html
http://social.technet.microsoft.com/for ... aae9e7749/
http://www.tomshardware.com/forum/23575 ... oft-please

There are lots of Google solutions that you could try, but here are a couple thoughts:

• Try a direction connection to the NAS to bypass the WNDR3700: http://sphardy.com/web/readynas/how-to- ... -readynas/


• Use TCP Optimizer: http://www.speedguide.net/downloads.php. Maybe you've got some IPv4 setting out of whack?