Author Topic: Which transfer/writespedd/throughput should I expect?  (Read 2816 times)

Wantoknow

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Which transfer/writespedd/throughput should I expect?
« on: January 26, 2009, 02:23:20 pm »
   

Which transfer/write speed/throughput can I expect? LS-Q4.0TL/R5, RAID 5, GB network (GB Linksys router, DLink switch, Marvell Yukon GB NIC).

 

I currently get about 5 MB/s (40 Mb/s)


Dustrega

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Re: Which transfer/writespedd/throughput should I expect?
« Reply #1 on: January 26, 2009, 06:08:02 pm »

Wantoknow,

   If you're getting 5 MB/s you are very close to the maximum transfer speed.  Are there any other factors in your network traffic?


Wantoknow

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Re: Which transfer/writespedd/throughput should I expect?
« Reply #2 on: January 26, 2009, 10:23:25 pm »
   

I did some more research and isolated traffic to just data transfer. Using a free tool (Disk Thruput Tester) that is normally used to determine read/write to disk, I arrived at a wide performance spread:

 

Sequential write results (3906 Mb in 3906 chunks): 9.1 MB/s to 37.9 MB/s

 

Sequential read results (3906 Mb in 3906 chunks): 16.2 MB/s to 66.3 MB/s

 

Random access results (3906 Mb in 3906 chunks): 6413.8 MB/s to 6545.8 MB/s

 

A second PC had similar results. The range is from far below the performace of a USB 2.0 device to about 1/3 above.

 

Any idea why the range is so wide (the tests were done on and isolated segment with no other traffic)?

 

I am satisfied with performance on par with ISB 2.0, but would like to tune whatever I can. With RAID 5 I have three heads writing, which should increase per formance for sequential activity. I am wondering whether the storage processor is the bottleneck?!!