Planning: MD3200i Series Storage Array Terms and Concepts 57• Least path weight with subset (Windows operating systems only)—Theleast queue depth with subset policy is also known as the least I/Os or leastrequests policy. This policy routes the next I/O request to a data path thathas the least outstanding I/O requests queued. For this policy, an I/Orequest is simply a command in the queue. The type of command or thenumber of blocks that are associated with the command are notconsidered. The least queue depth with subset policy treats large blockrequests and small block requests equally. The data path selected is one ofthe paths in the path group of the RAID controller module that owns thevirtual disk.Monitoring MD3200i Series System PerformanceYou can use the Performance Monitor to select virtual disks and RAIDcontroller modules to monitor or to change the polling interval.Keep these guidelines in mind when using the Performance Monitor:• The Performance Monitor does not dynamically update its display if anyconfiguration changes occur while the window is open. You must close thePerformance Monitor window and reopen it for the changes to bedisplayed.• Using the Performance Monitor to retrieve performance data can affectthe normal storage array performance depending on the polling intervalthat you set.• If the storage array you are monitoring begins in or transitions to anunresponsive state, an informational dialog is displayed. The dialoginforms you that the Performance Monitor cannot poll the storage arrayfor performance data.To monitor the performance of the arrays:1 Open MDSM and select the appropriate storage array.2 Open the Array Management Window (AMW) for the selected storagearray3 In the AMW, select Storage Array Monitor Performance.4 Click Settings.a Select the items that you want to monitor.You can monitor:
