Replacing A Control Module; Removing A Control Module - Dell EqualLogic PS4100 Hardware Maintenance Manual

PS4100 Hardware Maintenance Guide
All operations on the member are suspended, there is no I/O activity to or from the member, and the
member's firmware is not running.
Use the Standby On/Off button only when you need to quickly shut down an array and you may not have
access to the GUI or CLI; for example, if you discover a problem in your lab environment, such as high
temperature or a water leak that may damage the array, that requires you to shut down the array as soon as
possible.
Caution: Do not shut down the array (with the standby on/off button or by any other method) before re-
placing a failed control module! If the member is shut down and a controle module is removed, the array
automatically returns to full-power mode.
Using the Standby On/Off button on one member does not affect any other group members. You must press
the button on each member that has it. Group members that do not have the button remain online; to shut
them down, you must use the GUI or CLI.

Replacing a Control Module

If a control module fails, remove it and replace it with a functioning control module. Do not remove a failed
control module until you are ready to replace it. You may need to temporarily remove a control module to
replace its microSD card.
Note: For proper cooling, do not leave a control module slot empty. If an array will operate for a long time
with only one control module, you must install a blank in the empty slot. You can order a control module
blank from your PS Series array service provider.
You can partially or completely remove a control module without shutting down the array if the remaining
control module has at least one connected and functioning network interface. However, if you remove the
active control module (the LED labeled ACT will be green), there will be a short interruption as failover to
the secondary control module occurs.
Otherwise, if possible, cleanly shut down the array before removing the module, as described in
Down and Restarting an Array on page
Caution: Do not remove a control module from an array while the control modules are still synchronizing.
A message will appear on the console when synchronization completes. The ACT LED on the secondary
control module will be orange when synchronization completes.

Removing a Control Module

Before removing a control module:
• Attach an electrostatic wrist strap, as described in
• Disconnect any serial or network cables attached to the control module. Optionally, re-attach the
network cables to the other control module to provide uninterrupted data access.
To remove a control module:
1. Push down on the orange release button. See
22
5.
Protecting Hardware on page
Figure 16.
Maintaining Control Modules
Shutting
1.