[Bugs] [Bug 1450685] New: Document options to configure geo-replication for lower latency

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1450685

            Bug ID: 1450685
           Summary: Document options to configure geo-replication for
                    lower latency
           Product: GlusterFS
           Version: 3.10
         Component: doc
          Assignee: bugs at gluster.org
          Reporter: nh2-redhatbugzilla at deditus.de
                CC: bugs at gluster.org



Description of problem (on gluster 3.10.1):

With default settings, geo-replication has very high latency, about 15 seconds
until a change done to a master appears on a replication slave.

The key setting to control this delay is `rollover-time`.

This setting is not documented in glusterfs docs; I could only find it via
mailing list replies and in the Troubleshooting section of RedHat Storage:
https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3.1/html/Administration_Guide/sect-Troubleshooting_Geo-replication.html.

Please add the relevant settings to the docs, and also a section in the
geo-replication docs to give hints on how latency can be improved.

Also relevant: https://bugzilla.redhat.com/show_bug.cgi?id=1450684

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