Dell MD3220 owner manual Monitoring MD3200 Series System Performance

•Least path weight with subset (Windows operating systems only)—The least queue depth with subset policy is also known as the least I/Os or least requests policy. This policy routes the next I/O request to a data path that has the least outstanding I/O requests queued. For this policy, an I/O request is simply a command in the queue. The type of command or the number of blocks that are associated with the command are not considered. The least queue depth with subset policy treats large block requests and small block requests equally. The data path selected is one of the paths in the path group of the RAID controller module that owns the virtual disk.

Monitoring MD3200 Series System Performance

You can use the Performance Monitor to select virtual disks and RAID controller 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 any configuration changes occur while the window is open. You must close the Performance Monitor window and reopen it for the changes to be displayed.

•Using the Performance Monitor to retrieve performance data can affect the normal storage array performance depending on the polling interval that you set.

•If the storage array you are monitoring begins in or transitions to an unresponsive state, an informational dialog is displayed. The dialog informs you that the Performance Monitor cannot poll the storage array for performance data.

To monitor the performance of the arrays:

1Open MDSM and select the appropriate storage array.

2Open the Array Management Window (AMW) for the selected storage array

3In the AMW, select Storage Array→ Monitor Performance.

Planning: MD3200 Series Storage Array Terms and Concepts

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