Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Instrukcja Użytkownika Pobierz pdf (Strona 25)

For best performance of remote replication, the average workload (reads and writes) should be equal on

both controllers and on both fabrics and ISLs. To obtain this balance, take measurements and keep the

utilization rate of each ISL below 40%. If one link fails, the average utilization of the operating link should

not exceed 80%. Similarly, the utilization rate of a single controller as measured on all host ports should not

exceed 45% on average, or peak above 50%, to prevent overloading the surviving controller should one

controller fail.

Remember, all members of a DR group must share a preferred controller. Therefore, load balancing a

single application with all of its virtual disks in a single DR group (as required) across multiple controllers is

not possible.

Monitoring EVA activity

You can use HP StorageWorks Command View EVA Performance Monitor (EVAPerf) to monitor and display

EVA performance metrics in real time from a command line interface or a graphical user interface

(Windows PerfMon). You can also display performance metrics in an external application, such as

Microsoft Excel using a CSV (comma-separated value) or TSV (tab-separated value) format. EVAPerf is

automatically installed by HP Command View software suite. The EVAPerf components are installed in the

following directory:

C:\Program Files\Hewlett-Packard\EVA Performance Monitor

For example, the command evaperf.exe drt –cont shows the DR Tunnels activity. Figure 16 shows the

command output. For best performance of remote replication, free write and free command resources

should be available. If values for these metrics are consistently low, the DR group tunnel becomes a

bottleneck. Balance the DR groups between controllers on source and destination array to create new

tunnels. Up to four concurrent tunnels can be used between the arrays.

Figure 16. Command output

For more information on EVAPerf use, see the Performance analysis of the HP StorageWorks EVA using

Command View EVAPerf software tool white paper.

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Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Instrukcja Użytkownika Strona 25