[arch-general] mdadm: RAID-5 performance sucks

Karol Babioch karol at babioch.de
Tue Apr 9 12:16:00 EDT 2013


I've got four HDDs and added them into a RAID-5 array, which basically
works just fine. However the performance sucks quite hard. I get only
about 70 MB/s when it comes down to reading and writing speeds of about
35 MB/s.

The hardware itself is quite decent: Intel Xeon E31260L, 8 GB RAM and
four Samsung HD204UI's. With the same setup and a Ubuntu live
environment I get about 270 MB/s reading speed and 130 MB/s writing speed.

Therefore there must be a fundamental difference. I've compared various
values from sysctl between both environments and set them accordingly,
but to no availability.

Anyone else experiencing the same issues and/or can you point me in the
right direction?

At least I would like to saturate my Gigabit Ethernet connection.

Best regards,
Karol Babioch

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