[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

Steve D <sdainard at spd1.com> changed:

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--- Comment #3 from Steve D <sdainard at spd1.com> ---
Sorry took a while to get back to this. My arbiter node was a VM before, I
decided to get another physical host running and added some storage.

I should also mention all my bricks are SSD's, net is 10gig.

I added a 3rd disk, replica 3 no arbiter:

Fuse mount point:
dd if=/dev/zero of=test10 bs=1M count=200 oflag=direct
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 0.360235 s, 582 MB/s

I then rebuilt the volume with replica 3 arbiter 1:

Fuse mount point:
dd if=/dev/zero of=test bs=1M count=200 oflag=direct
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 2.75525 s, 76.1 MB/s

Obviously there was some performance impact from the virt env, although I have
no idea what that would be. But in either case there is a significant gap here.

Also I'm noticing that an Ovirt VM backed by rep3/arbiter 1 gets significantly
less write speed:
dd if=/dev/zero of=test bs=1M count=200 oflag=direct
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 16.5165 s, 12.7 MB/s

In replica 3 no arbiter, the VM gets:
dd if=/dev/zero of=test bs=1M count=200 oflag=direct
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 0.392785 s, 534 MB/s

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