Owners Manual

PS5000 Hardware Maintenance Maintaining Control Modules
3–3
Control Module Handling Requirements
You must adhere to the following control module handling requirements:
• Protect control modules from electrostatic discharge. Always wear an
electrostatic wrist strap when handling a control module, as described in
Using an Electrostatic Wrist Strap on page 1-4. When not installed, store a
control module in an antistatic bag or place it on a surface protected from
electrostatic discharge.
• Do not remove a control module from an array while the control modules
are synchronizing. When synchronization completes, a console message will
appear. Also, the ACT LED on the secondary control module will be orange.
• Do not leave a control module slot empty. In an array with one control
module, always attach a blank face plate to the empty control module slot.
Identifying Control Module Failures
A failure in a control module can be indicated by the following:
• A control module’s ERR LED is red or the PWR LED is off but there is
power to the array. See Interpreting Control Module LEDs on page 3-2.
• The ACT LED on one control module is green, but the ACT LED on the other
control module is off instead of orange.
• A message on the console, in the event log, or in the Group Manager GUI
Alarms panel describes a control module failure.
• The GUI Member Controllers window or CLI
member select show
controllers
command shows the control module as not installed.
CM0 refers to the control module to the right, when viewing the array back panel.
CM1 refers to the control module to the left.
Understanding Failover Behavior
A PS5000 array can have one to three active network connections. In a dual
control module array, only one control module is active (serving network traffic)
at one time. Each control module includes a battery-backed write cache for storing
recently-used data. For redundancy, the cache on the secondary control module
mirrors the data that is stored in the cache on the active control module.
Each control module has three ports: Ethernet 0, Ethernet 1, and Ethernet 2. The
active control module can use a network interface only if there is a cable