5-2 Sun StorEdge 3000 Family FRU Installation Guide • May 2004
5.1 Replacing an I/O Controller Module
Be sure to follow the “Static Electricity Precautions” on page 1-5. The I/O controller
modules are hot-serviceable. Hot-serviceable means that the module can be replaced
while the array and hosts are powered on but the connected hosts must be inactive.
Caution – Connected hosts must be inactive during this replacement procedure.
5.1.1 Saving the Configuration Settings to NVRAM
Before replacing a controller module, save the configuration settings to NVRAM. If
power is removed before you replace an I/O controller module, the settings can be
restored from NVRAM.
Caution – If you power off the array and replace a controller module, the
replacement controller could become the primary controller and overwrite any
configuration settings previously set.
Caution – If controllers are not shut down from the firmware application or the CLI
before an array is powered off, data that is written to cache and that has not been
completely written to the disks will be lost.
Note – It is also important to save the configuration settings to NVRAM after
replacing a failed drive.
1. From the firmware application Main Menu, choose “system Functions.” Use the
arrow keys to scroll down, and choose “controller maintenance.”
2. Choose “Save nvram to disks” and press Return. Select Yes to confirm. A message
informs you that NVRAM information has been successfully saved.
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