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Why are there a lot of processes named ext4-dio-unwrit on my system?

Solution Unverified - Updated 2014-09-15T08:50:17+00:00 -

Issue

There are a lot of processes with the name ext4-dio-unwrit running on the system.
What are those processes?
Why so many ext4-dio-unwrit processes?

Environment

Red Hat Enterprise Linux 5.6 and later
Red Hat Enterprise Linux 6

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