PS4000 Hardware Maintenance Maintaining Control Modules
3–15
charged, as soon as the battery status is good/charging, you can
temporarily disable the low-battery-safe policy and force the array to
operate in write-back mode. Make sure to re-enable the low-battery-safe
policy when the battery is fully charged. See the PS Series Group
Administration manual for information about cache policies.
Replacing the Firmware Card
The control modules in a PS Series array contain a firmware card that runs the PS
Series firmware. The physical characteristics of the firmware card depend on the
control module type:
• A Type 8 control module includes a compact flash card
• A Type 9 control module includes a micro SD card
If a control module fails, remove the compact flash or micro SD card from the
failed control module and install the card in the replacement control module. This
will make sure that the new control module is running the correct firmware. See
Replacing a Compact Flash Card on page 3-16 or Replacing a Micro SD Card on
page 3-18 for more information.
You can access the firmware card by sliding the control module partially from the
slot. If you completely remove the control module, place it on a surface that is
protected from electrostatic discharge.
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,. 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.
Before replacing a firmware card:
• Attach an electrostatic wrist strap, as described in Using an Electrostatic Wrist
Strap on page 1-5.
• See Removing a Control Module on page 3-9 for instructions on removing a
control module.
Caution: Be careful not to damage the circuit board. Do not use sharp
instruments to remove the card.
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