Dell EqualLogic PS4000 Hardware Maintenance

Also see for EqualLogic PS4000: Configuration guide Hardware Quick reference guide Instructions Installation and setup manual

Contents

Dell EqualLogic PS4000 Hardware Maintenance Manual pdf 27 page image

PS4000 Hardware Maintenance Maintaining Control Modules3–3Identifying Control Module FailuresYou can identify a failure in a control module by:• LEDs. See Interpreting Control Module LEDs on page 3-2.• Messages. A message on the LCD panel (located behind the bezel), on theconsole, in the event log, or in the Group Manager GUI Alarms paneldescribes a control module failure.• Group Manager GUI and CLI output. The Member Controllers window orthe member select show controllers command output shows thecontrol module status not installed.When viewed from the rear of the array, CM0 is on the right, and CM1 is on theleft. See Figure 1-3.If a control module fails, see your PS Series support provider for a replacement.Understanding Failover BehaviorIn a dual control module array, only one control module is active (serving networktraffic) at one time. Each control module includes a battery-backed write cache forstoring recently-used data. For redundancy, the cache on the secondary controlmodule mirrors the data that is stored in the cache on the active control module.The active control module can use a network interface only if there is a cableconnected to the port on the active control module. Therefore, you should connecta cable to a network interface port on each control module to make sure that bothcontrol modules can access an interface.Table 3-2: Ethernet Port LED DescriptionsLED Location Color DescriptionLeft side of eachportOff No power or not connected to network.Green Connected to network.Right side of eachportOff No power, not transmitting, or not receiving.Green Transmitting or receiving.