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February 18th, 2010 14:00
ISCSI Speeds
Excellent article I have been struggling with the Multi-Pathing for a couple of weeks and this defiantly fix my slow 12Mbps transfer speeds I was getting. I am now getting maximum of 140MBps which is alot better but am I correcting in thinking I should be able to get more. If 1Gbps = 125MBps and I have two 1Gbps links two each controller with multi-pathing and round robin enabled I should be able to get 200-250MBps?
To get my transfer speeds I was using ATTO disk benchmark and Vsphere VM disk performance graphs
What sort of speeds should I settle for?
Regards
Dave Mac
To get my transfer speeds I was using ATTO disk benchmark and Vsphere VM disk performance graphs
What sort of speeds should I settle for?
Regards
Dave Mac
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Aaron Hamlett
17 Posts
0
March 29th, 2011 14:00
But there are several factors that can limit the throughput on your NICs. Size of the data being transmitted can make a huge difference in througput. 4K blocks of data causes more IOPS but lower MB/s, 32K blocks of data has fewer IOPS but more MB/s. Also, reads will usually push more data per second than writes. And of course sequential is faster than random (read or write) So with 32K blocks, 100% read, 0% random, with 2 NICs enabled you would probably get 170 - 190MB/s (roughly).
mattslavin
55 Posts
0
April 4th, 2011 13:00
All and all if your getting 140 MB out the pipe, your doing really good.