hi, all:
When I was testing glusterfs performance by iozone with only ONE machine, I got the following chart:
https://dl.dropbox.com/u/33453649/perf_htm_m19da4047.jpg
Y axis represent disk throughput in kb/s. X axis represent test cases.
It is obvious that R+W case has the worst read performance, R+W means you turn on both Read-ahead xlator and Write-behind xlator. Unfortunately, that`s the default configuration of glusterfs.
Though I run glusterfs only on one machine, I think this result explains something. Maybe you have more insight on it.
More info:
-------------------------
cmdline: ./iozone -a -n 16g -g 16g -i 0 -i 1 -i 2 -i 3 -f /mnt/iozone -Rb no-rh.xls -y 4096k
CPU: intel i3-2120 X 4
RAM: 8G
Glusterfs Version: 3.3
Volume info:
Volume Name: abc
Type: Distribute
Volume ID: 6e0104f1-d32a-4ed4-b011-d29ccf27abe1
Status: Started
Number of Bricks: 1
Transport-type: tcp
Bricks:
Brick1: 10.1.82.224:/abc
Options Reconfigured:
performance.io-cache: off
performance.quick-read: off
performance.read-ahead: on
performance.write-behind: on
--------------------------------------------
Best Regards.
Jules Wang.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20121214/be35b3d6/attachment.html>
