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Measuring performance is a necessary task to determine whether current utilization levels require a system to be upgraded and whether user applications and system
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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
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services are executing as quickly and efficiently as possible. Solaris provides a wide variety of tools to tune and monitor the operation of individual devices and core system elements, and other tools that can be applied to improve performance. These tools work with the kernel, disk, memory, network, compilers, applications, and system services. This chapter examines how to use some of the standard Solaris tools to monitor performance, identify performance issues and bottlenecks, and implement new settings.
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NOTE An alternative to using the tools provided with Solaris is to use the SymbEL tools
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developed by Adrian Cockroft and Richard Pettit (http://www.sun.com/sun-on-net/ performance/se3), which are fully described in their book, Sun Performance and Tuning, published by Sun Microsystems Press (1998).
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The following procedures are commonly used to manage logfiles, quotas, and accounting.
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Examining Logfiles
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Logfiles are fairly straightforward in their contents, and you can stipulate what events are recorded by placing instructions in the syslog.conf file. Records of mail messages can be useful for billing purposes and for detecting the bulk sending of unsolicited commercial e-mail (spam). The system log records the details supplied by sendmail: a message-id, when a message is sent or received, a destination, and a delivery result, which is typically delivered or deferred. Connections are usually deferred when a connection to a site is down. sendmail usually tries to redeliver failed deliveries in four-hour intervals. When using TCP wrappers, connections to supported Internet daemons are also logged. For example, an FTP connection to a server will result in the connection time and date being recorded, along with the hostname of the client. A similar result is achieved for Telnet connections. A delivered mail message is recorded as
Feb 20 14:07:05 server sendmail[238]: AA00238: message-id= <bulk.11403.19990219175554@sun.com> Feb 20 14:07:05 server sendmail[238]: AA00238: from=<sun-developers-l@sun.com>, size=1551, class=0, received from gateway.site.com (172.16.1.1) Feb 20 14:07:06 server sendmail[243]: AA00238: to=<pwatters@mail.site.com>, delay=00:00:01, stat=Sent, mailer=local
whereas a deferred mail message is recorded differently:
Feb 21 07:11:10 server sendmail[855]: AA00855: message -id=<Pine.SOL.3.96.990220200723.5291A-100000@oracle.com> Feb 21 07:11:10 server sendmail[855]: AA00855: from=<support@oracle.com>, size=1290, class=0, received from gateway.site.com (172.16.1.1) Feb 21 07:12:25 server sendmail[857]: AA00855: to=pwatters@mail.site.com,
Part IV:
Managing Devices
delay=00:01:16, stat=Deferred: Connection timed out during user open with mail.site.com, mailer=TCP
An FTP connection is recorded in a single line,
Feb 20 14:35:00 server in.ftpd[277]: connect from workstation.site.com
in the same way that a Telnet connection is recorded:
Feb 20 14:35:31 server in.telnetd[279]: connect from workstation.site.com
Implementing Quotas
Solaris provides a number of tools to enforce policies on disk and resource usage, based around the idea of quotas, or a prespecified allocation of disk space for each user and file system. Thus, a single user can have disk space allocated on different slices, and file systems can have quotas either enabled or disabled (they are disabled by default). Although many organizations disable disk quotas for fear of reducing productivity by placing unnecessary restrictions on the development staff, there are often some very good reasons for implementing quotas on specific slices. For example, if an open file area, like an anonymous FTP incoming directory, is located on the same partition as normal user data, a denial of service (DoS) attack could be initiated by a rogue user who decides to fill the incoming directory with large files, until all free space is consumed. A CGI application that writes data to a user s home directory (for example, a guestbook) can also fall victim to a DoS attack: a malicious script could be written to enter a million fake entries into the address book, thereby filling the partition to capacity. The result in both of these cases is loss of service and loss of system control. It is therefore important that networked systems have appropriate checks and balances in place to ensure that such situations are avoided. Quotas are also critical to ensure fair resource sharing among developers. Otherwise, a developer who decides to back up her PC drive to her home directory on a server, completely filling the partition, could thereby prevent other users from writing data. In addition to security concerns, enforcing quotas is also optimal from an administrative point of view: it forces users to rationalize their own storage requirements, so that material that is not being used can be moved offline or deleted. This saves administrators from having to make such decisions for users (who may be dismayed at the results if the administrator has to move things in a hurry!). One simple policy is to enforce disk quotas on all public file systems that have network access. Increasing quotas for all users is easy, therefore the policy can be flexible. In addition, quotas can be hard or soft: hard quotas strictly enforce incursions into unallocated territory, whereas soft quotas provide a buffer for temporary violations of a quota, and the users are given warning before enforcement begins. Depending on the security level at which your organization operates (for example, C2 standards for military organizations), a quota policy may already be available for you to implement. A total limit on the amount of disk space available to users can be specified using quotas for each user individually. Consider the user pwatters on server as an example.
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