Lesson 2 in Visual Basic .NET

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Lesson 2
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Monitoring Windows XP Perfromance
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12-25
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Logical disk A logical disk is a volume on a physical disk. A physical disk can have multiple logical disks. Monitoring a logical disk gives an indicator of how often that volume is being accessed by applications or how much disk space is available on that volume. Disk reads A disk read operation occurs when the operating system requests information from the disk. After information is read from the disk, it can be stored in file system cache. On a system with sufficient memory to support file system caching, the number of disk reads should be relatively low because most read requests are serviced from cache (fast reads). Disk writes A disk write operation occurs when the operating system receives a request to save data to the hard disk. Windows XP supports write-behind cach ing, which permits the operating system to gather many disk write requests together and write them to the disk simultaneously, reducing the overall number of disk writes performed. Disk queue The disk queue is where disk read and write requests are stored while waiting to be processed by the hard disk. The more requests waiting in the queue, the more difficulty the disk has meeting the computer s needs.
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You can detect disk bottlenecks by monitoring and evaluating several important phys ical and logical disk counters. Physical disk counters provide information on the activ ity of a hard disk as a whole. Logical disk counters report statistics on the volumes (drive letters) that are created on the disks. Table 12-4 lists and briefly describes these counters.
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Table 12-4
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Important Disk-Related Counters
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Counter % Free Space Description Ratio of free disk space that is available to total usable disk space on a particular logical disk. The percentage of time that the selected physical disk is busy servicing read or write requests. If this value is consistently over 50 percent, the hard disk is having trouble keeping up with the load that is being placed on it. The rate at which bytes are being trans ferred. The higher the number, the better the disk is performing.
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Object Logical Disk
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Physical Disk
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% Disk Time
Logical Disk Physical Disk
Disk Bytes/sec
12-26
12
Monitoring System Performance in Windows XP
Table 12-4
Important Disk-Related Counters
Counter Avg. Disk Bytes/Transfer Description Measures the size of I/O operations. A higher value indicates more efficient disk usage. The average number of both read and write requests that are queued for the selected disk. If this value averages two or more, the disk is a bottleneck.
Object Logical Disk Physical Disk Physical Disk
Avg. Disk Queue Length
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. Which of the following pieces of information can you view by using Task Manager A. Current CPU usage B. The percentage of time that a physical disk is busy C. The amount of available physical memory D. The percentage of the paging file currently in use 2. You are using the Performance tool to monitor the performance of a user s com puter. You notice that the processor regularly averages over 80 percent utilization when the computer is used normally. You also notice that the Pages/sec counter for the memory object averages around 4. What does this indicate to you A. The processor is a potential bottleneck. B. The physical disk is a potential bottleneck. C. The memory is a potential bottleneck. D. This value is within the acceptable range for normal computer use.
Lesson Summary
Task Manager provides information about applications and processes currently running on a computer and provides real-time performance information about processor, memory, and network usage.
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