[Bugs] [Bug 1296271] New: Enhancement: Configure maximum iops for shd

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1296271

            Bug ID: 1296271
           Summary: Enhancement: Configure maximum iops for shd
           Product: GlusterFS
           Version: 3.7.5
         Component: replicate
          Severity: low
          Assignee: bugs at gluster.org
          Reporter: joe at julianfamily.org
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Servers can become resource starved during self-heal events causing a
performance impact to the clients. Allow a configurable iops cap to shd to
allow less impact to the clients.

Today, a large game developer was in IRC trying to track down a problem with
his write performance. His hardware was more than adequate to keep up with his
iops and throughput needs (HP Z420 with 8 SSDs in RAID 0 attached to a LSI Raid
controller), but during a self-heal event, writes were noticeably slower.

As part of his failure strategy, if a server fails, he replaces it with a new
one and populates the new server via self-heal with 23 million files totalling
2.3TB. It is during this event that he experiences slow writes.

If we had a way to limit the resources used by shd, we should be able to
prevent this type of problem.

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