Alcatel-Lucent 5620 Troubleshooting Manual page 241

When a disk is I/O bound and performance suffers, contact your Alcatel-Lucent support
representative. Provide the data collected in this procedure.
1
2
3
Heading
disk
r/s
w/s
Kr/s
Kw/s
wait
actv
svc_t
%w
%b
Alcatel-Lucent 5620 Service Aware Manager, Release
3HE 05723 AAAD TQZZA Edition 01
• If the sluggish performance is not isolated using the iosat command, use the
vmstat command in Procedure 8-3.
Perform the 5620 SAM client GUI or OSS application procedures in chapter 9.
•
Open a command or shell tool.
To collect data to determine whether there is a disk bottleneck, type:
iostat -x time ↵
where time is the time, in seconds, over which you want to collect data. Alcatel-Lucent
recommends that you start with 2 s.
To stop the iostat command, press CTRL-C.
Review the iostat output. The following is a sample of iostat data. See Table
for a description of the iostat report.
disk r/s w/s
sd1 0.1 0.2
sd3 0.1 0.5
disk r/s w/s
sd1 0.0 0.0
sd3 0.0 0.0
Table 8-2 iostat report description
Description
Name of the disk
Reads per second
Writes per second
Reads per second (kb/s)
Writes per second (kb/s)
Average number of transactions waiting for service (queue length)
Average number of transactions actively being serviced (removed from the queue
but are not yet complete)
Average service time in ms
Percentage of time there are transactions waiting for service (non-empty queue)
Percentage of time the disk is busy (transactions in progress)
Troubleshooting Guide
8 — Troubleshooting Solaris and Windows platforms
extended disk statistics
Kr/s Kw/s wait actv
0.9 3.3 0.0
1.1 3.7 0.0
extended disk statistics
Kr/s Kw/s wait actv
0.0 0.0 0.0
0.0 0.0 0.0
8.0 R4 Aug 2010
svc_t %w %b
0.0 34.3 0 0
0.0 73.1 0 90
svc_t %w %b
0.0 0.0 0 0
0.0 0.0 0 1
8-2
8-5