I have a brick on a MD RAID5 array formatted with ext4 on a gigabit network.
My brick is located at /srv/media.
dd if=/dev/zero of=/srv/media/test.zero reports 150MB/sec
dd reading reports 300MB/sec
I have used iperf to verify it is not a network adapter issue. I get
1gbit/sec each way.
On GlusterFS 3.2 my read and write performance was as expected.
100MB/sec each way.
On GlusterFS 3.3, my read speed is still 100MB/sec but my write speed
never exceeds 10MB/sec. It seems something is purposely throttling my
writes like I'm on a 100mbit network.
CPU usage on the server and client are around 25% during the transfer.
No other processes are eating I/O.
Any ideas on why write performance is suffering?
gluster> volume info
Volume Name: media
Type: Distribute
Volume ID: 990a5d58-f76c-405c-a7bf-096e70b9fed3
Status: Started
Number of Bricks: 1
Transport-type: tcp
Bricks:
Brick1: 10.0.0.1:/srv/media
Options Reconfigured:
auth.allow: 10.0.0.*
nfs.disable: On
performance.cache-size: 128MB
performance.write-behind-window-size: 128MB
Thanks,
Michael
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