How to Monitor OS level monitors?

One method of monitoring OS resources utilization by examining the performance counter logs which contains several critical counters that are used when evaluating performance issues. There are a number of primary counters that we’ll look at and they include metrics for CPU, memory, and disk performance.

CPU Metrics

Counter	Description
System\Processor Queue Length\(N\A)	Logs the number of items waiting to be processed by the CPU. Values higher than 2 indicates the need to add more or faster processors.
Processor\% Processor Time\_Total	Records the current CPU utilization. This log helps determine the need for additional processor capacity.
Processor\Interrupts\Sec	Records the number of times processing is stopped to handle a hardware request for disk or memory I/O. Values higher than 1000 may indicate a hardware issue.

Memory Metrics

Counter	Description
Memory\Pages/sec\(N/A)	Monitors the data written to or read from memory. Values higher than 200 indicates the need to increase RAM.
Memory\Pages Faults/sec\(N/A)	Records the number of times that data was not found in memory.
Memory\Available Mbyers\(N/A)	Monitors the amount of memory available to the system. Values below 10% of total physical memory indicate the need for more RAM.
Memory\Pool Nonpaged Bytes\(N/A)	Records the amount of data that cannot be paged on the disk.

Disk Metrics

Counter	Description
PhysicalDisk\% Disk Time\DriveLetter	Logs the amount of time for which disk is active during the last monitoring period. Values higher than 80% indicate that there may be a problem with the hard drive controller or insufficient memory.
PhysicalDisk\Current Disk Queue Length\DriveLetter	Logs the number of the items waiting to be written to or read from the disk. Values higher than 2 indicate a problem with the disk subsystem. RAID 5 or RAID 10 should be implemented to improve performance.