GPFS Performance Report (Uses iozone command)

zsjheng, rock

0. Machine Informance

Node	8 nodes (1 server , 7 client provide disks)
CPU	Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (each node)
Memory	2GB DDR2 667 (each node)
Disk	320G+160G (each node), All nodes: (320G+ 160G) * 7 = 3.36T
NIC	Intel Corporation 82566DM Gigabit Network Connection
Switch	D-link 24 port GE switch

1. 8 Nodes, No Replicate, Adjust Parameters

$ iozone -g 16g -aRb test.wks

2. 8 Nodes, Replicate, Adjust Parameters

$ iozone -g 16g -aRb test2.wks

3. Comapre

The following six diagrams show the testing results using IOzone as the benchmark to evaluate how GPFS works with and without data-replication. The six IO operations we have done for performance evaluation are write, re-write, read, re-read, random read, and random write opertion, respectively. The left surface chart of each diagram represents the testing with data-replication enable, and the right one is opposite.

The first diagram of comparison indicates the write opertion testing on GPFS. It shows a difference about 130 MB per second of the maximum throughput, and we found that the maximum throughput of the left one is higher than the right one. The evaluation result is out of our expection that the writing operation without data-replication should perform well than with data-repication enable.

4. Running information

gpfs-server:/home/gpfs_mount# ls
iozone.tmp  iozone.tmp.DUMMY  test.wks

gpfs-server:/home/gpfs_mount# du -h
69M     .
gpfs-server:/home/gpfs_mount# du -h
129M    .
gpfs-server:/home/gpfs_mount# du -h
129M    .
gpfs-server:/home/gpfs_mount# du -h
25M     .
gpfs-server:/home/gpfs_mount# du -h
129M    .
gpfs-server:/home/gpfs_mount# du -h
107M    .

gpfs-server:/home/gpfs_mount# dstat -cdn -M gpfs -N eth1
----total-cpu-usage---- -dsk/total- --net/eth1- --gpfs-i/o-
usr sys idl wai hiq siq|_read _writ|_recv _send|_read write
  0   0  98   0   0   2| 622B   13k|   0     0 | 0.3     0 
  1   2  94   0   1   2|   0     0 |   0     0 |  16M   16M
  1   3  90   0   1   6|   0     0 |  43M   53M|   0    24M
  0   1  98   0   0   1|   0     0 |   0     0 |   0    11M
  0   2  92   0   1   5|   0     0 |5653k  120M|   0    19M
  0   2  93   0   1   3|   0     0 |   0     0 |   0    25M
  1   4  88   0   2   6|   0     0 |  13M  187M|   0    33M
  1   3  92   0   1   3|   0     0 |   0     0 |  58M    0 
  1   4  86   0   2   8|   0     0 |   0     0 |  86M    0 
  0   2  95   0   0   2|   0     0 | 140M   34M|  29M    0 
  1   6  86   0   2   6|   0     0 |   0     0 |  87M  128M
  1   4  87   0   1   6|   0     0 | 119M 4232k|  50M    0 
  1   4  87   0   2   6|   0     0 |   0     0 |  51M    0