NFS Performance Tuning for HP-UX 11.0 and 11i Systems

nfs performance tuning for hp-ux 11.0 and 11i systems page 16
Notes:
Page 16July 22, 2002
Copyright 2002 Hewlett- Packard Company
iozone
local
filesystems
64
256
1024
4096
16384
65536
262144
4
64
1024
16384
0
50000
100000
150000
200000
250000
300000
350000
400000
450000
Throughput (KBytes/Second)
File Size (KBytes)
Record Size
(KBytes)
VxFS Normal Read
400000-450000
350000-400000
300000-350000
250000-300000
200000-250000
150000-200000
100000-150000
50000-100000
One of the better filesystem performance benchmark utilities available is iozone. It
can perform a wide variety of I/O operations, including: read, re-read, write, re-
write, random read and write, etc. It also has many advanced capabilities, such
as: testing with different record lengths, locking the target file during reads and
writes, unmounting/re-mounting filesystems between tests, etc. It can even
generate test results in Microsoft Excel format to simplify graphing the throughput
numbers.
Don Capps, of the HP’s Technical Computing Division, is one of the authors of
iozone. The best source of information about iozone is the dedicated website:
http://www.iozone.org. This site holds the latest source code, which is
available at no cost, as well as program documentation and sample output graphs.
The users guide includes a detailed explanation of the available command-line
options, and instructions for generating Excel  charts using the data you collect.
It is important to measure the local filesystem capabilities of both the client and the
server since both are usually involved in NFS activities. As with the networking
tools described earlier, iozone results do not directly correlate to potential NFS
throughput numbers. They merely reflect the capabilities of the local filesystem.