What can cause read speed from NAS slower than write?

[Blue_Orca]

My setup is as follows:

PC-Switch-NAS

QNAP TS-459 Pro II with two Intel 320 SSD 300GB running in RAID 0. DRAM populated is 3GB.
Cisco SG200-08 smart switch.
PC has Intel i350-t2 GbE PCIe2 x4 NIC in a PCIe2 x4 slot. Drives on PC are 2 SSD and a HDD.

SSDs on NAS were formated in Ext4, and write caching is enabled.
Link aggregation and 9000 MTU are enabled on GbE ports on NAS, switch and NIC card.

Using "LAN Speed Test" from Totusoft, with a 4GB packet length, I'm getting 136MByte/s for write, but only 97MByte/s for read.

Is there something I may have overlooked or missed? Anything you think I can do to push the read speed up?

Thanks.

Regards,

Blue

 

[thiggins]

NASes frequently have significantly different read and write speeds. There are a lot of factors.

Try running a different benchmark, like the Intel NASPT tests or large Windows file copies and you'll get different results.

SSD's are really only going to provide an advantage for things like database writes, not large file copies.