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Managing Devices
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If you saved this script as directorysize.pl in /usr/local/bin/directory and set the executable permissions, it would produce a list of directory sizes as output, like the following:
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# cd /etc # /usr/local/bin/directorysize.pl 28 14 12 16 402 1362 2 418 2186 ...
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Because you are interested in usage management, you might want to modify the script as follows to display the total amount of space occupied by a directory and its subdirectories, as well as the average amount of space occupied. The latter number is very important when evaluating caching or investigating load balancing issues.
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#!/usr/local/bin/perl # directorysize.pl: reads in directory size for current directory # and prints the sum and average disk space used to standard output $sum=0; $count=0; @ps = `du -o`; for (@ps) { ($sizes,$directories)=split /\s+/, $_; $sum=$sum+$sizes; $count=$count+1; } print "Total Space: $sum K\n"; print "Average Space: $count K\n";
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Note that du -o was used as the command, so that the space occupied by subdirectories is not added to the total for the top-level directory. The output from the command for /etc now looks like this:
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# cd /etc # /usr/local/bin/directorysize.pl Total Space: 4832 K Average Space: 70 K
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Again, you could set up a cron job to mail this information to an administrator at midnight every night. To do this, first create a new shell script to call the Perl script, which is made more flexible by passing as arguments the directory to be measured and the user to which to send the mail:
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#!/bin/csh -f cd $1 /usr/local/bin/directorysize.pl | mailx s "Directory Space Usage" $2
If you save this script to /usr/local/bin/checkdirectoryusage.csh and set the executable permission, you could then schedule a disk space check of a cache file system. You could include a second command that sends a report for the /disks/junior_developers file system, which is remotely mounted from client, to the team leader on server:
0 0 * * * /usr/local/bin/checkdirectoryusage.csh /cache squid@server 1 0 * * * /usr/local/bin/checkdirectoryusage.csh /disks/junior_ developers team_leader@server
Tools may already be available on Solaris to perform some of these tasks more directly. For example, du s will return the sum of directory sizes automatically. However, the purpose of this section has been to demonstrate how to customize and develop your own scripts for file system management.
Generating Accounting Reports
Once you have enabled data collection, generating reports is a simple matter of setting up a cron job for a nonprivileged user (usually adm), typically at a time of low system load. In the following example, accounting runs are performed at 6 A.M.:
0 6 * * * /usr/lib/acct/runacct 2> /var/adm/acct/nite/fd2log
Accounting runs involve several discrete stages, which are executed in the following order:
SETUP WTMPFIX CONNECT PROCESS MERGE FEES DISK Prepares accounting files for running the report Checks the soundness of the wtmpx file and repairs it, if necessary Gathers data for user connect time Gathers data for process usage Integrates the connection and process data Gathers fee information and applies to connection and process data Gathers data on disk usage and integrates with fee, connection, and process data
MERGETACCT Integrates accounting data for the past 24 hours (daytacct) with the total accounting data (/var/adm/acct/sum/tacct)
Part IV:
Managing Devices
CMS CLEANUP
Generates command summaries Removes transient data and cleans up before terminating
After each stage of runacct has been successfully completed, the statefile (/var/adm/ acct/nite/statefile) is overwritten with the name of that stage. Thus, if the accounting is disrupted for any reason, it can be easily resumed by rereading the statefile. On January 23, if the statefile contained FEES, but terminated during DISK, you could restart the accounting run for the day by using the following command:
# runacct 2301 DISK >> /var/adm/acct/nite/fd2log
Once the daily run has been completed, the lastdate file is updated with the current date in ddmm format, where dd is the day and mm is the month of the last run. In addition, you can review a number of files manually to obtain usage summaries. For example, the daily report is stored in a file called rprtddmm, which contains the CMS and lastlogin data, as well as a connection usage summary:
Jan 26 02:05 2002 DAILY REPORT FOR johnson Page 1 from Fri Jan 25 02:05:23 2002 to Sat Jan 26 02:05:54 2002 TOTAL DURATION IS 46 MINUTES LINE MINUTES PERCENT /dev/pts/1 0 0 pts/1 46 0 TOTALS 46 --
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