Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 327

The various panels display information about the selected member. Monitor Control Modules Each group member has one or two control modules installed. One control module is designated as active (responsible for serving I/O to the member). On the active control module the LED labeled ACT is lit. In a dual control module array, the other control module is secondary (mirrors cache data from the active control module). On startup, either control module can be designated active or secondary, regardless of its previous status. Under normal operation, the status of a control module (active or secondary) does not change unless you restart the member. In a single control module array, if the control module fails, the member is offline. In a dual control module array, if the active control module fails, the secondary control module becomes active and begins serving I/O (called control module failover). I/O should continue if you connect cables to the newly active control module. For information about replacing control modules, see the Hardware Owner's Manual for your array model or contact your PS Series support provider. To display control module information: 1. Click Group. 2. Expand Members and select the member name. 3. Click the Controllers tab. Each Control Module Slot panel shows the following information. NOTE: In some cases, after a control module has been upgraded or replaced, the Group Manager GUI might display a failed status for the control module's power supply or battery. The GUI will update automatically after a few minutes to reflect the correct status. • Status • Boot time • Cache battery status or cache-to-flash module and NVRAM battery status, depending on the array model • Model number and type • Boot ROM version • PS Series firmware version An empty slot means that a control module is not installed or has failed. The system might temporarily indicate that a slot is empty while a control module is rebooting. For information about replacing a control module, see the Hardware Owner's Manual for your array model or contact your PS Series support provider. Do not remove a failed control module until you have a replacement. The Memory Cache panel displays the cache mode. Control module and battery status affect the cache mode. Write-through mode might impair performance. Identify why the cache is in write-through mode and correct the problem, if necessary. Control Module Status Table 57. Control Module Status describes status values for control modules. About Monitoring 327