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Counter Logical Disk(*)\AvgSec/Read
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Description The Logical Disk(*)\Avg Sec/Read counter is used to measure the amount of time that a read operation takes to respond to the operating system
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Considerations
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When you are looking at either the Logical Disk(*)\ AvgSec/Read counter or the Logical Disk(*)\Avg Sec/Write counter, keep the following readings roughly in mind when you Logical The Logical Disk(*)\Avg Disk(*)\AvgSec/Write Sec/Write counter is used are figuring out your disk to measure the amount of performance: time that a write operation One ms to 15 ms is healthy takes to respond to the At 16 ms to 25 ms, you operating system could start to monitor more At 25 ms and greater, you re having an issue and you need to figure out what s going on with your disk
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Table 10-3 Disk IO Counters to Monitor
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chapters, the disk subsystem is often the cause of many of the problems you will face with your virtualized environment As such, make sure that you plan your disk layout ahead of time, ensuring that you have plenty of throughput to your disk subsystem There are a few things that you can do if you are experiencing disk subsystem issues: Implement a SAN Use faster disks Build a RAID array for your virtual machines Add more disks to your RAID array Implement a faster connection method such as 10GB Ethernet or 4GB Fibre
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Network counters are similar to disk counters where you are ultimately monitoring the host system s total network IO In this case, that IO is made up of mostly guest network traffic No matter which performance counter you are looking at, you always want to look at both the host and the guest The reason you want to look at both is that when you have to troubleshoot why your network is slow, you will want to be able to rule out virtual machines that are dormant, and be able to have a view into the virtual machines
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that may be the cause of the disruption When you are monitoring the network on the host and the guests, there are four main counters that you need to watch: Network Interface(*)\ Bytes Total/Sec Network Interface(*)\Output Queue Length
Table 10-4 explains each of these counters and what to consider for each counter
Counter
Description
Considerations When you are figuring out if your system is in a good health state or not, you can use these numbers as a road map to help out If your interface is running less than 40 percent consumed, your system is healthy If your interface is running between 41 and 64 percent, you should be monitoring that interface If your interface is running 65 to 100 percent, you are probably experiencing some negative performance on that interface
Network Interface\ The Bytes Total/Sec counter Bytes Total/Sec is used to monitor the rate at which the network adapter is processing data bytes The Bytes Total/ Sec counter also includes protocol information, application data, and file data This counter is the sum of the Bytes Sent/Sec and the Bytes Received/ Sec You can calculate the percent of network utilization by multiplying the Bytes/sec by 8 to represent as bits You then take that total and multiple that by 100 and then divide that number by the NIC s current bandwidth Network The Network Interface(*)\ Interface(*)\Output Output Queue Length Queue Length measures the number of threads waiting on the NIC
This is a pretty straightforward counter If there are no threads in the queue, your system is healthy If you have one or two threads in the queue, you should be monitoring your interface; and if you have more than two, you ve got some form of bottleneck and more than likely you are experiencing some negative performance on that interface
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