User`s guide

5.15 How to Physically Replace a Cache Module
Use the procedure in Table 5–5 to replace your cache module.
CAUTION
For safety reasons, only qualified personnel may remove or replace
write-back cache modules. For complete instructions for replacing the
write-back cache module, refer to the StorageWorks Array Controllers HS
Family of Array Controllers Service Manual.
Table 5–5 Cache Module Replacement
Step Description
1 The controller module is seated in front of the cache module. Anytime you
service a cache module, you must consider when it is appropriate to remove the
controller module (based on considerations of configuration, down time, and so
on).
2 To replace the cache module, its controller module must already be removed.
(You should replace the cache module before reinstalling the controller module.)
3 Ground yourself to the cabinet grounding stud (refer to Figure 5–7).
4 Slide the cache module into the shelf using its slot’s leftmost rails as guides
(refer to Figure 5–10).
5 Press firmly and use a gentle up-and-down rocking motion on the module until
it is seated. Finally, press firmly once more to make sure the module is seated.
6 Replace the controller module (Refer to Section 5.14).
5.16 Checking the Status of the Write-Back Cache Module Batteries
You will receive a console message when the write-back cache module
batteries are low. However, to check the battery status, you may enter the
SHOW THIS_CONTROLLER or SHOW OTHER_CONTROLLER commands from
the CLI. The battery status will be GOOD, LOW, or BAD.
If your write-back batteries do not recharge in the allotted time, they need to be
replaced. Only qualified service personnel may replace write-back cache module
batteries. Refer to the StorageWorks Array Controllers HS Family of Array
Controllers Service Manual for complete instructions for removing and replacing
the batteries.
Digital recommends that you have your write-back cache batteries replaced every
5 years.
5.17 Using the Controller SHUTDOWN Command Prior to Turning
Off Controller Power
If you wish to turn off the power to your controller subsystem for any reason
(such as a long holiday, system move, replacing a bad SCSI host cable, and so
forth), make sure you turn off the power properly by using the following steps:
Controller Operations 5–43