100Mbps speeds on 1000Mbps network

[Neurogenesis]

Problem: Can't get file transfer speeds over 12MB/sec...avg is around 7-8MB/sec..this happens system to system, or system to NAS, or NAS to system


The setup:

I have a 24 port linksys gigabit swith, 6 computers, 5 NAS devices....all gigabit

every system on the network, other than the nas, is running windows 7

the switch is registering gigabit connections, indicated by the link lights
Jumbo frame is ON and is supported by all systems

What has been tried:
i have turned remote differential compression OFF, from what few articles i read on the web

tried different cables

tried other ports

cycled everything

updated drivers

tried a separate switch

DHCP on/off

Jumbo Frame on/off

anybody have any insight as to what to try? i have been looking all over the web and only found the concept of turning remote differential compression off

NAS is a iomega ix4

 

[Neurogenesis]

anyone? bueler?

 

[sup3rsprt]

are you using cat5e or cat6 ethernet cable? if not, maybe that's your problem. it doesn't really make sense. making a gigabit network should be as easy as plugging everything in.. maybe (but I doubt it) your hard drives are not fast enough to keep up with the network throughput. try to defragment

 

[pparks1]

Can you put an FTP server on any of the devices and try copying the files via FTP and see what your network speeds are?

 

[Neurogenesis]

ill try the ftp portion to see if that changes anything


new cat 6 cables, just in case the previous copper had developed a memory


im running 2 10,000 raptor drives in raid 0 in the main system, the nas is running raid 5 with 5400rpm drives, and the other main system is running 2 7200 rpm drives in raid 0

 

[Neurogenesis]

its gotta be the freakin NAS, was getting >100MB/sec using the crossover

 

[pparks1]

Make sure that your devices have write caching enabled.