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You may allot this user, a Java developer, a quota of 10MB for development work on the /staff file system. To set up this quota, you need to undertake the following steps: 1. Edit the /etc/vfstab file as root, and add the rq flag to the mount options field for the /staff file system. This enables quotas for the file system. 2. Change the directory to /staff, and create a file called quotas. 3. Set permissions on /staff/quotas to be read and write for root only. 4. Edit user quotas for user pwatters on file system /staff by using the edquota command, and entering the number of inodes and 1KB blocks that will be available to user pwatters. For example, enter the following:
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# fs /staff blocks (soft = 10000, hard = 11000) inodes (soft = 0, hard = 0)
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5. Check the settings that you have created by using the quota command. 6. Enable the quota for user pwatters by using the quotaon command. You can implement these steps by entering the following:
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# # # # # # # vi /etc/vfstab cd /staff touch quotas chmod u+rw quotas edquota pwatters quota v pwatters quotaon /staff
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When you verify the quotas using quota -v,
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# quota -v pwatters
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the output should look like the following:
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Disk quotas for pwatters (uid 1001): Filesystem usage quota limit /staff 0 10000 11000 timeleft 0 files 0 quota 0
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Note that there may be a bug on the Intel version, since this command may hang indefinitely, but no problems have been reported on SPARC. You can see that a soft limit of 10MB and a hard limit of 11MB was entered for user pwatters. If halfway through the development project this user requests more space, you could adjust the quota by using the edquota command again. To check quotas for all users, use the repquota command:
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# repquota /staff Block limits
Part IV:
Managing Devices
User jsmith pwatters qjones llee
-----
used soft 2048 4096 131 10000 65536 90000 4096 8192
hard 8192 20000 100000 10000
Again, there may be a bug on the Intel version, but no problems have been reported on SPARC. If a user attempts to exceed their quota during an interactive session, unless you ve set up a warning to be issued under those circumstances, the first indication that the user will have often comes in the form of a file system full or write failed message. After checking the amount of free space on the partition where their home disk is located, many users are at a loss to explain why they can no longer edit files or send e-mail.
Collecting Accounting Data
Collecting data for accounting is simple: create a startup script (/etc/rc2.d/S22acct) to begin collecting data soon after the system enters multiuser mode and, optionally, create a kill script (/etc/rc0.d/K22acct) to turn off data collection cleanly before the system shuts down. When accounting is enabled, details of processes, storage, and user activity are recorded in specially created logfiles, which are then processed daily by the /usr/lib/acct/runacct program. The output from runacct is also processed by /usr/lib/acct/prdaily, which generates the reports described in the next section. There is also a separate monthly billing program called /usr/lib/acct/monacct, which is executed monthly and generates accounts for individual users.
Collecting Performance Data
The following applications are commonly used to measure system performance:
iostat vmstat mpstat sar Collects data about input/output operations for CPUs, disks, terminals, and tapes from the command line Collects data on virtual memory performance from the command line and prints a summary Breaks down CPU usage per operation type Runs through cron or the command line to collect statistics on disk, tape, CPU, buffering, input/output, system calls, interprocess communication, and many other variables
The following sections examine how each of these commands is used.
iostat
The kernel maintains low-level counters to measure various operations, which you can access by using iostat. When you first execute it, iostat reports statistics gathered since booting. Subsequently, the difference between the first report and the current
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