HP AD510A HP StorageWorks 1500 Modular Smart Array maintenance and service gui - Page 80

Removing the controller cache module, Carefully pull the cache module away from the controller board

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Removing the controller cache module If your system is equipped with a single controller, and you must replace the controller cache: • You must schedule a maintenance window and remove power from the system to perform the service. If your system is equipped with two controllers: • and you are replacing a cache module with another module of the same size, you can remove one of the controllers and replace the module on that controller while the system is running. • and you are replacing a cache module with a module of a different size, you must schedule a maintenance window and remove power from the system to then change the cache module on both controllers at the same time. The memory size of the cache modules must be the same on both controllers. IMPORTANT: Replacement controllers include a new cache module. Remove the new module from the replacement controller and replace it with the cache module from the failed controller. Using the same cache module completes disk writes trapped in the controller cache. 1. Remove the controller from the chassis as instructed in Removing the controller. 2. Locate the controller cover clips on the rear, lower left, and right sides of the module by holding the controller upright with the latch handle facing you. 3. Unlatch the controller cover clips (1) on the rear of the controller and raise the cover (2). 4. Simultaneously unlatch the clips that are holding the controller cache in place (3). 5. Carefully pull the cache module away from the controller board (4). 2 1 3 4 15514 Removing the controller cache battery pack The controller cache module has two rechargeable and replaceable Nickel Metal Hydride (NiMH) battery packs. Under normal operating conditions, these should last for three years before replacement is necessary. They are continuously recharged via a trickle charging process whenever the MSA storage system is powered on. Battery packs protect data on the controller cache module against equipment failure or power outage for up to four continuous days. 80 Customer replaceable components

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Removing the controller cache module
If your system is equipped with a single controller, and you must replace the controller cache:
•
You must schedule a maintenance window and remove power from the system to perform the service.
If your system is equipped with two controllers:
•
and you are replacing a cache module with another module of the
same
size, you can remove one of
the controllers and replace the module on that controller while the system is running.
•
and you are replacing a cache module with a module of a
different
size, you must schedule a
maintenance window and remove power from the system to then change the cache module on
both controllers at the same time. The memory size of the cache modules must be the same on
both controllers.
IMPORTANT:
Replacement controllers include a new cache module. Remove the new module from the replacement
controller and replace it with the cache module from the failed controller. Using the same cache module
completes disk writes trapped in the controller cache.
1.
Remove the controller from the chassis as instructed in
Removing the controller
.
2.
Locate the controller cover clips on the rear, lower left, and right sides of the module by holding the
controller upright with the latch handle facing you.
3.
Unlatch the controller cover clips (
1
) on the rear of the controller and raise the cover (
2
).
4.
Simultaneously unlatch the clips that are holding the controller cache in place (
3
).
5.
Carefully pull the cache module away from the controller board (
4
).
1
2
3
4
15514
Removing the controller cache battery pack
The controller cache module has two rechargeable and replaceable Nickel Metal Hydride (NiMH)
battery packs. Under normal operating conditions, these should last for three years before replacement is
necessary. They are continuously recharged via a trickle charging process whenever the MSA storage
system is powered on.
Battery packs protect data on the controller cache module against equipment failure or power outage for
up to four continuous days.
80
Customer replaceable components