The efficiency monitor is a utility used to trace a spread of processes and provides an actual time graphical show of the outcomes Home windows 2003 system. This device can be utilized to help you with the planning of upgrades, monitoring of processes that should be optimized, monitoring outcomes of tuning and configuration situations, and the understanding of a workload and its impact on useful resource utilization to determine bottlenecks.
Utilizing Home windows Perfmon to find out efficiency for iSCSI just isn’t fairly the identical when monitoring bodily disks which are immediately accessed by the system. As you understand, your community configuration and gear can have the best influence on iSCSI efficiency. Having a excessive efficiency change that does community buffering and stream management, having good cables between the Goal and Initiators, and having high quality NIC playing cards is vital to reaching optimum efficiency. The iSCSI software program is able to reaching quick charges very close to the theoretical restrict of 120 MB/second. However a lot of the efficiency will depend on the surroundings by which iSCSI is working.
You shouldn’t be making any form of iSCSI efficiency evaluation primarily based solely on the Bodily Disk counters in Home windows Perfmon or comply with normal efficiency guidelines that many have posted on the net that relate to bodily disk I/O as a result of they don’t apply to iSCSI. There is no such thing as a bodily correlation between the SAN bodily disk queue and the Home windows Perfmon bodily disk counters as soon as iSCSI is concerned as all disk instructions at the moment are encapsulated in community packets. You may usually divide the Perfmon bodily disk counters by the variety of disk spindles on the SAN to reach at a ballpark quantity for the Perfmon bodily disk counters however it isn’t an actual science.
A greater strategy for efficiency evaluation with Home windows Perfmon is so as to add within the Microsoft iSCSI initiator courses specializing in them and the Perfmon community counters equivalent to latency. You might also embody the logical disk counters however the identical caveat ought to apply to them because the bodily disk counters; they don’t seem to be the only measure of iSCSI SAN efficiency.
PhysicalDiskAvg. Disk Queue Size counter signifies the common variety of each learn and writes requests that had been queued for the chosen disk in the course of the pattern interval. PhysicalDiskAvg. Disk Learn Queue Size counter signifies the common variety of learn requests that had been queued for the chosen disk in the course of the pattern interval. PhysicalDiskAvg. Disk Write Queue Size counter signifies the common variety of write requests that had been queued for the chosen disk in the course of the pattern interval.