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twcarlinFlag for United States of America

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Nas device transfer speed really slow

Ok here is the deal- We have 2 NAS devices and 4 windows servers (2008 and 2003), along with a bunch of Windows 7 pro PCs. The NAS devices are a Buffalo terastation pro II with 4 1TB 7200 Sata drives in RAID 5 and a Netgear ReadyNas NV+ also with 4 1 TB 7200 Sata drive in RAID 5.

Both NAS have the latest firemware.

The entire network is all Gigabit speed.

I can copy a 1.5 GB file from the main file server to any of the windows machines at 100 MB/sec. But copying the same file to the Buffalo I get only 15 MB/sec, and copying to the Netgear I get only 10MB/sec. I've turned off all the extra services. I am NOT using Jumbo Frames anywhere.  

I haven't tried is moving the NAS to a different switch. Will try that next.

So, any ideas? Or is this just a function of the slow processors/memory/hard drives on the NAS?
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David
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Thanks for the help- It's what I expected, was hoping some magic wand was available :)