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Decisions About Objects and Counters
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You can make the choice of performance objects and counters for monitoring a server, either for a baseline or ongoing performance evaluation, in one of two ways. One approach to server monitoring examines the role that the server performs in the environment and the corresponding demands placed on that server by the user population. Another view of server monitoring involves examining object categories of counters such as Processor, Memory, Network Interface, and PhysicalDisk, with less emphasis on the role that the server fulfills and more on a consistent monitoring standard.
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Server Roles
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Monitoring by server role is useful when servers perform within a single role in the network environment. These roles are defined by the services or resources that the server provides to the users. Examples of server roles include domain controllers, file servers, and Web servers. A server s demand for resources can be matched, in a performance monitoring situation, with the appropriate object counters that measure the resources most heavily used by a server in that role. Ongoing performance monitoring data can
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Lesson 2
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Using the Performance Console
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be compared to baseline data for optimization within that role. Table 12-1 outlines the objects that are commonly used when analyzing a server by its role.
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Table 12-1
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Server Roles and Objects To Be Monitored
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Resources Used Memory, network, and processor cache Processor and network Disks, network, and processor Memory, processor, network, and disk Objects and Counters Memory, Processor, Network Interface, and System System, Server, Processor, and Network Interface PhysicalDisk, LogicalDisk, Processor, Network Interface, and System Memory, Processor, System, Network Interface, protocol objects (network-dependent, but can include TCPv4, UDPv4, ICMP, IPv4, NBT Connection, NWLink IPX, NWLink NetBIOS, and NWLink SPX), PhysicalDisk, and LogicalDisk Memory, Network Interface, PhysicalDisk, LogicalDisk, and Print Queue Memory, Cache, Processor, System, PhysicalDisk, Network Interface, and LogicalDisk Cache, Network Interface, PhysicalDisk, and LogicalDisk
Server Role Application servers Backup servers Database servers Domain controllers
File and print servers Mail/messaging servers Web servers
Memory, disk, and network components Processor, disk, network, and memory Disk, cache, and network components
For each server role, create a baseline using the counters within each object appropriate for the role, and periodically examine each of the servers for significant changes.
Object Categories
In a network environment where servers perform within multiple roles, role-based monitoring can leave important gaps in monitored data. In such cases, more complete data should be collected from each of the primary object categories. Memory Counters After you have established a baseline for memory use, periodic monitoring should be performed for deviations from that baseline. The following counters are useful in monitoring computer system memory:
Memory shortages: Memory\Available Bytes, Available Kbytes, or Available MBytes (to see the amount in megabytes); Process (All_processes)\Working Set; Memory\Pages/sec; Memory\Cache Bytes. These counters show how much memory is taken up by all processes and how much memory is available.
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12
Monitoring Microsoft Windows Server 2003
Frequent hard page faults: Memory\Pages/sec; Process (All_processes) \Working Set; Memory\Pages Input/sec; Memory\Pages Output/sec. Hard page faults occur when a page of memory is needed but has been placed (swapped) into virtual memory. Excessive swapping degrades the performance of the computer and can be addressed either by reducing the demands on the computer or increasing the amount of physical RAM.
Network Counters Network counters report data from the network interface cards (NICs) installed in the computer, and from the segment on which the NICs communicate. The following counters are useful in measuring the performance of a computer on the network:
Network Interface\Output Queue Length; Bytes Total\sec. The Queue length should be low and the total bytes high, which indicates a network card that is transferring packets quickly and without delay. Network Interface: Bytes Sent/Sec; Current Bandwidth; Bytes Received/ Sec. High values in these counters consistently and over time indicate that a network is being expected to carry more traffic than is optimal. Segmenting the network into smaller pieces or increasing the bandwidth of the network will decrease the chances of bottlenecks due to excessive traffic.
Different types of network configurations will allow for various levels of traffic efficiency and volume. When monitoring %Network Utilization, for example, 30 percent utilization is the maximum recommended for an unswitched Ethernet network. This means that a 10megabyte (MB) Ethernet network becomes bottlenecked when its throughput exceeds 3 MB per second. If the value of the counter is above 40 percent, data collisions begin to hamper the performance of the network.
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