troubleshooting Question

slow disk read/write problem over network.

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crcsupportFlag for United States of America asked on
Networking Hardware-OtherNetwork ManagementNetwork Operations
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I have configured 4 SAS 15k RPM disks in RAID 1+0.
I ran read/write test using two simple benchmarket softwares downloaded from download.com. It shows that read/write to the drive locally shows;
read 600MB/s
write 580MB/s

Then I ran the same tests over network from multiple workstations, it shows;
read  6MB/s ~ 18MB/s
write 11MB/s ~ 40MB/s

I think there's some delay in network which causes the difference. Both ends of server and workstations have 1Gbps link. So, in theoretically, I expected somewhere between 50MB/s ~ 100MB/s for read/write. But it's way too lower.

What can it cause this delay and where should I start troubleshooting? Can it be some nic configurations on both end?

Both ends have auto negotiation and switch as well.
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