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Linux Software RAID10 Benchmarks

January 31st, 2010

Tests are done across four 7200RPM SATAII drives on a PCI-X card sitting on a PCI (32-bit, 133MB/sec theoretical max) bus, probably the slowest bus configuration possible, and then again after being moved to a motherboard with dual PCI-X slots. Server is running Ubuntu 9.10 AMD64 Server.

Benchmark is a simple ‘dd’ sequential read and write.

write: dd if=/dev/zero of=/dev/md2 bs=1M
read: dd if=/dev/md2 of=/dev/null bs=1M

mdadm –create /dev/md2 –verbose –level=10 –layout=n2 –raid-devices=4 /dev/sd[ftlm]1

write: 13.2 MB/s 144 MB/s
read: 4.0 MB/s 89.3 MB/s

mdadm –create /dev/md2 –verbose –level=10 –layout=f2 –raid-devices=4 /dev/sd[ftlm]1

write: 48.3 MB/s 131 MB/s
read: 92.7 MB/s 138 MB/s

mdadm –create /dev/md2 –verbose –level=10 –layout=o2 –raid-devices=4 /dev/sd[ftlm]1

write: 47.4 MB/s 135 MB/s
read: 98.7 MB/s 142 MB/s

And moreĀ comparisons:


write: 38.9 MB/s
read: 64.8 MB/s

Single Disk (PCI)

write: 59.4 MB/s
read: 71.9 MB/s

Categories: file systems, server
  1. ryan
    August 25th, 2010 at 11:25 | #1

    Hello, was this done on a router running DD-WRT?

    please see / weigh-in to this thread if you can spare a minute: http://www.dd-wrt.com/phpBB2/viewtopic.php?p=477269

    I am curious if I am about to start down a dead-end path.. and your experience as demonstrated on this post may help us determine one way or the other.

    Thank you!

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