[Bugs] [Bug 1255110] client is sending io to arbiter with replica 2

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1255110

Ravishankar N <ravishankar at redhat.com> changed:

           What    |Removed                     |Added
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              Flags|                            |needinfo?(sdainard at spd1.com
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--- Comment #2 from Ravishankar N <ravishankar at redhat.com> ---
Hi Steve,
1. You're correct on the observation that we send the writes even to the brick
process of the arbiter node (even though the writes are not written to the
disk). But we need the write to be sent to the brick for things to work. (AFR
changelog xattrs depend on this). What we could do is send only one byte to the
arbiter instead of the entire data. I'll work on the fix.

2. FWIW, I'm not able to recreate the drastic difference in 'dd' throughputs
(1.1 vs 65,6 MB/s ?) as described in comment #1. I notice only marginal
difference in my test setup. Can you check if you're hitting the same behaviour
on a normal replica 3 volume?

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