The performance observe is a utility applied to observe a vary of procedures and give a true time graphical screen of the final results Windows 2003 procedure. This resource can be utilized to assist you with the organizing of upgrades, monitoring of processes that have to have to be optimized, checking success of tuning and configuration scenarios, and the being familiar with of a workload and its impact on source utilization to detect bottlenecks.
Working with Windows Perfmon to determine functionality for iSCSI is not rather the exact when checking bodily disks that are directly accessed by the process. As you know, your network configuration and products will have the biggest impression on iSCSI effectiveness. Having a large overall performance change that does network buffering and movement command, possessing good cables concerning the Concentrate on and Initiators, and acquiring high quality NIC playing cards is essential to achieving optimum effectiveness. The iSCSI program is capable of attaining quickly charges incredibly near the theoretical restrict of 120 MB/second. But so significantly of the performance is dependent on the atmosphere in which iSCSI is running.
You ought to not be making any kind of iSCSI general performance analysis centered solely on the Bodily Disk counters in Home windows Perfmon or stick to standard overall performance rules that numerous have posted on the web that relate to bodily disk I/O mainly because they do not implement to iSCSI. There is no physical correlation among the SAN physical disk queue and the Windows Perfmon physical disk counters at the time iSCSI is involved as all disk instructions are now encapsulated in community packets. You can usually divide the Perfmon physical disk counters by the quantity of disk spindles on the SAN to arrive at a ballpark range for the Perfmon bodily disk counters but it is not an exact science.
A superior strategy for efficiency analysis with Windows Perfmon is to insert in the Microsoft iSCSI initiator courses concentrating on them and the Perfmon network counters this kind of as latency. You may possibly also include things like the reasonable disk counters but the exact same caveat should really utilize to them as the actual physical disk counters they are not the sole evaluate of iSCSI SAN efficiency.
PhysicalDiskAvg. Disk Queue Duration counter suggests the common number of both read through and writes requests that were queued for the chosen disk all through the sample interval. PhysicalDiskAvg. Disk Read through Queue Duration counter signifies the typical quantity of browse requests that have been queued for the picked disk for the duration of the sample interval. PhysicalDiskAvg. Disk Publish Queue Size counter implies the normal amount of compose requests that had been queued for the picked disk during the sample interval.