How to calculate max theoretical write speeds

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Joshua West

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Sep 11, 2013
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I have a raid 5 consisting of 7drives and a hot spare. I have 2 identical systems that have a dual gigabit nics. These 2 machines connect through a gigabit switch and when I transfer data between the 2 machines I'm utilizing 99-100% network utilization. The raid is writing data at 120-130Mb a second. My question is how can I figure out what mymaxx write capability is and how can I get more throughput utilizing adapter teaming or other options.

BTW this is hardware raid using 3ware 9550sxu-8lp and 8 WD2002FAEX HDDs.
 
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F


With NIC bonding you should be able to move about 200MB/s.

It's doable only with Intel NIC and decent Gb Switch
My DIY NAS transfer 200MB to SSD via Round-Robbin bonding - both Target and Source have bonding NIC
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Nikolay Savov

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Apr 9, 2013
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Google some calculators .....
f.e.
http://www.raid-calculator.com/Default.aspx - raid calculator
http://techinternets.com/copy_calc - data transfer calculator

In you case you are caped up to 1 Gbit/s by the switch. = 125 MB/s
and you may never get Ethernet at 100% ( if you have other trafic ) so you consider you maximum speed is below < 125 MB/s

Teaming 2 x LAN ports will not gain more than 10-20 % performance.
There are other fabrics for conectivity but it`s Enterprice solutions not sure you aming at this .....
 
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FireWire2

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Oct 30, 2006
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With NIC bonding you should be able to move about 200MB/s.

It's doable only with Intel NIC and decent Gb Switch
My DIY NAS transfer 200MB to SSD via Round-Robbin bonding - both Target and Source have bonding NIC
 
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Solution
J

Joshua West

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Sep 11, 2013
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10,510
OK. This uses Intel proset 1000 onboard nic from a supermicro X7DWA-N motherboard. We are in fact getting 115meg up to 125 sometimes. Task manager shows 99-100% network utilization on 1 port showing 1Gbps link speed. The gigabit switch is a cheapo netgear 8port unmanaged.

It would seem that I getting max speed using 1 port and I would like to incorporate the 2nd port, however I can't find any info on what my max write speed or how its calculated on a 7 drive raid 5 using raid controller. If I'm close to peak speed then a 2nd nic won't matter.

 
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