[Gluster-users] Need help on performance issue

[MySystem 365]

We have a very simple GlusterFS setup as our mail server files storage. We
are facing problem with the performance, you can see I/O wait if very high.
We are quite new to GlusterFS, could someone helps? Thank a lot.

=========version=============
[root at g1 ~]# glusterfsd --version
glusterfs 3.5.0 built on Apr 23 2014 12:53:55

[root at g2 ~]# glusterfsd --version
glusterfs 3.5.0 built on Apr 23 2014 12:53:55


==========volume info==========
[root at g1 ~]# gluster volume info

Volume Name: GFSv1-data
Type: Replicate
Volume ID: c8902563-fb57-4549-9bfe-fb49c1f4182d
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: g1.i-admin.com:/GlusterFS/data
Brick2: g2.i-admin.com:/GlusterFS/data
Options Reconfigured:
auth.allow: 192.168.3.*


[root at g2 ~]# gluster volume info

Volume Name: GFSv1-data
Type: Replicate
Volume ID: c8902563-fb57-4549-9bfe-fb49c1f4182d
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: g1.i-admin.com:/GlusterFS/data
Brick2: g2.i-admin.com:/GlusterFS/data
Options Reconfigured:
auth.allow: 192.168.3.*


==========I/O wait - g1 ==============

top - 14:20:39 up 122 days,  3:02,  3 users,  load average: 17.31, 16.13,
14.51
Tasks: 117 total,   2 running, 115 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.2%us,  0.3%sy,  0.0%ni,  0.0%id, 99.5%wa,  0.0%hi,  0.0%si,
 0.0%st
Mem:   3802844k total,  3598252k used,   204592k free,  1844472k buffers
Swap:  3948536k total,      696k used,  3947840k free,  1048028k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
12583 root      20   0 1162m  39m 2912 S  1.0  1.1  23:20.09 glusterfsd
   12 root      20   0     0    0    0 R  0.3  0.0   2:32.30 events/1
    1 root      20   0 19232  608  432 S  0.0  0.0   0:00.48 init
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.02 kthreadd
    3 root      RT   0     0    0    0 S  0.0  0.0   0:00.30 migration/0



==========I/O wait - g2 ==============

top - 14:14:00 up 121 days, 21:24,  3 users,  load average: 10.93, 9.45,
9.09
Tasks: 117 total,   1 running, 116 sleeping,   0 stopped,   0 zombie
Cpu(s):  6.0%us,  6.7%sy,  0.0%ni,  0.2%id, 87.1%wa,  0.0%hi,  0.0%si,
 0.0%st
Mem:   3737300k total,  3506328k used,   230972k free,  1597872k buffers
Swap:  3948536k total,      936k used,  3947600k free,  1183916k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 4841 root      20   0 1166m  45m 2968 S 26.0  1.2   9:49.25 glusterfsd
   22 root      20   0     0    0    0 S  0.3  0.0   1:12.73 kblockd/0
    1 root      20   0 19232  700  516 S  0.0  0.0   0:00.80 init
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.06 kthreadd
    3 root      RT   0     0    0    0 S  0.0  0.0   0:00.34 migration/0
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