8 — Troubleshooting Solaris and Windows platforms
Alcatel-Lucent 5620 Service Aware Manager, Release 8-5
3HE 05723 TQZZA Edition 01 Troubleshooting Guide
When a disk is I/O bound and performance suffers, contact your Alcatel-Lucent support
representative. Provide the data collected in this procedure.
• 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.
1 Open a command or shell tool.
2 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.
3 Review the iostat output. The following is a sample of iostat data. See Table 8-2
for a description of the iostat report.
extended disk statistics
disk r/s w/s Kr/s Kw/s wait actv svc_t %w %b
sd1 0.1 0.2 0.9 3.3 0.0 0.0 34.3 0 0
sd3 0.1 0.5 1.1 3.7 0.0 0.0 73.1 0 90
extended disk statistics
disk r/s w/s Kr/s Kw/s wait actv svc_t %w %b
sd1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 1
Table 8-2 iostat report description
Heading Description
disk Name of the disk
r/s Reads per second
w/s Writes per second
Kr/s Reads per second (kb/s)
Kw/s Writes per second (kb/s)
wait Average number of transactions waiting for service (queue length)
actv Average number of transactions actively being serviced (removed from the queue
but are not yet complete)
svc_t Average service time in ms
%w Percentage of time there are transactions waiting for service (non-empty queue)
%b Percentage of time the disk is busy (transactions in progress)
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