Technical data

3–23
Compaq HSZ80 Array Controller ACS Version 8.3 Maintenance and Service Guide
In order to upgrade cache memory, the controller must be shut down. Use the
following steps to upgrade or add DIMMs:
1. From the host console, dismount the logical units in the subsystem. If you are
using a Windows NT platform, shut down the server.
2. If the controller is operating, connect a PC or terminal to the controller’s
maintenance port.
3. Shut down the controllers. In single controller configurations, shut down “this
controller.” In dual-redundant controller configurations, shut down the “other
controller” first, then shut down “this controller” with the following commands:
SHUTDOWN OTHER_CONTROLLER
SHUTDOWN THIS_CONTROLLER
When the controllers shut down, their reset buttons and their first three LEDs are
lit continuously. This may take several minutes, depending on the amount of data
that needs to be flushed from the cache modules.
CAUTION: ESD can easily damage a cache module or a DIMM. Wear a
snug-fitting, grounded ESD wrist strap.
4. Disable the ECB for the cache module in which you will be adding or replacing
DIMMS by pressing the battery disable switch until the status light stops
blinking—about five seconds.
CAUTION: The ECB must be disabled—the status light is not lit and is
not blinking—before disconnecting the ECB cable from the cache
module. Failure to disable the ECB could result in cache module
damage.
5. Disconnect the ECB cable from the cache module.
6. Disengage the two retaining levers, remove the cache module, and place the
cache module onto a grounded antistatic mat.
7. If you are adding DIMMs, insert the new DIMM straight into the socket and
ensure that the notches in the DIMM align with the tabs in the socket (see Figure
3–5).