I'm seeing this behavior too, on a RAID5 setup, ubuntu 14.04 - 32bit
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https://bugs.launchpad.net/bugs/1081019
Title:
Benchmark for disks always fails on
I'm getting the same issue in 11.04
(nautilus:12445): Unique-DBus-WARNING **: Error while sending message:
Did not receive a reply. Possible causes include: the remote application
did not send a reply, the message bus security policy blocked the reply,
the reply timeout expired, or the network
