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Table 16-2 System Monitor Counters for Monitoring Memory
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16:
Performance Tuning Exchange Server 2007
Object Processor
Counter % Processor Time (_Total)
Description This counter shows the percentage of the time the processor is busy processing non-idle threads You can also select specific instances of the Processor object to see how busy each processor is in a multi-processor system This value shows the number of times an interrupt is triggered by a peripheral (such as a disk, mouse, or network card) This will cause a rise in the % Processor Time counter An increase in this counter when the processor is busy indicates that hardware usage could be the cause This counter shows the number of threads waiting in a queue for the processor to handle If this value is consistently above 2, your processor is most likely overburdened
Processor
Interrupts/Sec
System
Processor Queue Length
Table 16-3 System Monitor Counters for Monitoring the Processor
Monitoring the Disk Subsystem
Windows 2003 allows you to monitor both logical disk counters and physical disk counters Logical disk counters focus on each logical drive you created on the system, while physical disk counters focus on actual disk usage Both are enabled by default in Windows 2003 Table 16-4 lists the counters you should use to monitor disk usage Because the counters are specific to disk activity, with System Monitor, there is no way to look at Exchange-specific disk activity
Monitoring the Network Subsystem
System Monitor s ability to monitor the network is limited to counters that inform you of general network information, such as network utilization, throughput, and transmit/ receive statistics If you need to monitor actual network traffic, System Management Server 2003 includes a Network Monitor tool to look at your network traffic packet by packet However, we will focus on System Monitor in this book Table 16-5 lists the counters you should use to monitor your network subsystem
Microsoft Exchange Server 2007: A Beginner s Guide
Object PhysicalDisk
Counter % Disk Time (_Total) Avg Disk Queue Length
Description This counter shows the percentage of the time the disk subsystem is busy You can also select each disk as a separate instance This counter shows the average number of requests (read or write) that are queued up to be handled by the disk subsystem Anything over an average value of 2 is considered high and may indicate that the disks are too slow relative to the demands being placed on them This counter shows the amount of time (in seconds) it takes to complete a single transfer of data
PhysicalDisk
PhysicalDisk
Avg Disk Sec/ Transfer
Table 16-4 System Monitor Counters for Monitoring Disks
Object Network Segment Network Interface
Counter % Network Utilization Output Queue Length
Description This counter shows the percentage of time the network is busy This counter shows the number of packets sitting in the output queue waiting to be sent A number above 2 may indicate either that a server is servicing too many clients or that a network interface card (NIC) needs to be upgraded This counter shows the rate at which frames of data are being received by that NIC
Network Segment
Total Frames Received/Sec
Table 16-5 System Monitor Counters for Monitoring the Network
16:
Performance Tuning Exchange Server 2007
MONITORING EXCHANGE 2007 WITH SYSTEM MONITOR
There are over 60 objects that are either directly or indirectly related to Exchange 2007 (that s double what was available when Exchange 2000 was released!) Each one of those objects has a number of counters associated with it Microsoft certainly has provided you with enough granularity for monitoring Exchange 2007 It would take a book of its own to cover every object and counter, so we ll focus on a few of the important objects to begin your monitoring of Exchange 2007
Mailbox Database Counters
Since most of your interaction with Exchange involves sending another user a message, it seems appropriate to take a look at the mailbox database specific counters There are so many viable counters with meaningful information you can use to establish a performance baseline or determine performance problems, that this object becomes quite important Table 16-6 lists the counters that you can use to monitor the mailbox database specific performance Also, note that for each mailbox store counter, you can choose an individual mailbox database in the Instance field (see Figure 16-4) This will allow you to narrow the focus of your monitoring to a subset of your Exchange environment
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