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The sar command is the most versatile method for collecting system performance data. From the command line, it produces a number of snapshots of current system activity over a specified number of time intervals. If you don t specify an interval, the current day s data extracted from sar s regular execution by cron is used. For example,
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to display a summary of disk activity for the current day, you can use the following command:
# sar d SunOS 5.10 sun4u 09:54:33 device sd01 sd03 sd05 sd06
01/25/04 %busy avque 27 5.8 17 2.4 13 1.7 35 6.9
r+w/s 6 4 3 8
blk/s 8 7 6 10
avwait 21.6 14.2 9.3 25.7
avserv 28.6 21.2 18.3 31.8
In this example, you can see that several disk devices are shown with varying percentages of busy time, mean number of transaction requests in the queue, mean number of disk reads and writes per second, mean number of disk blocks written per second, mean time for waiting in the queue, and mean time for service in the queue. When a new disk, new memory, or a new CPU is added to the system, you should take a baseline sar report to determine the effect on performance. For example, after adding 128MB RAM on the system, you should be able to quantify the effect on mean system performance by comparing sar output before and after the event during a typical day s workload.
Examples
The following examples show how to manage logfiles, quotas, and accounting.
Logging Disk Usage
For auditing purposes, many sites generate a df report at midnight or during a change of administrator shifts, to record a snapshot of the system. In addition, if disk space is becoming an issue and extra volumes need to be justified in a system s budget, it is useful to be able to estimate how rapidly disk space is being consumed by users. Using the cron utility, you can set up and schedule a script using crontab to check disk space at different time periods and to mail this information to the administrator (or even post it to a Web site, if system administration is centrally managed). A simple script to monitor disk space usage and mail the results to the system administrator (root@server) looks like this:
#!/bin/csh -f df | mailx s "Disk Space Usage" root@localhost
As an example, if this script were named /usr/local/bin/monitor_usage.csh and executable permissions were set for the nobody user, you could create the following crontab entry for the nobody user to run at midnight every night of the week:
0 0 * * * /usr/local/bin/monitor_usage.csh
20:
S y s t e m L o g g i n g , A c c o u n t i n g , a n d Tu n i n g
or you could make the script more general, so that users could specify another user who would be mailed:
#!/bin/csh -f df | mailx s "Disk Space Usage" $1
The crontab entry would then look like this:
0 0 * * * /usr/local/bin/monitor_usage.csh remote_user@client
The results of the disk usage report would now be sent to the user remote_user@client instead of root@localhost. Another way of obtaining disk space usage information with more directory-bydirectory detail is to use the /usr/bin/du command. This command prints the sum of the sizes of every file in the current directory and performs the same task recursively for any subdirectories. The size is calculated by adding together all of the file sizes in the directory, where the size for each file is rounded up to the next 512-byte block. For example, taking a du of the /etc directory looks like this:
# du /etc 14 7 6 8 201 681 1 209 1093 ... 2429 ./default ./cron.d ./dfs ./dhcp ./fs/hsfs ./fs/nfs ./fs/proc ./fs/ufs ./fs
Thus, /etc and all of its subdirectories contains a total of 2,429KB of data. Of course, this kind of output is fairly verbose and probably not much use in its current form. If you were only interested in recording the directory sizes, in order to collect data for auditing and usage analysis, you could write a short Perl script to collect the data, as follows:
#!/usr/local/bin/perl # directorysize.pl: reads in directory size for current directory # and prints results to standard output @du = `du`; for (@du) { ($sizes,$directories)=split /\s+/, $_; print "$sizes\n"; }
Part IV:
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