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EK-80DIM-IN-D01

May 2000

12 pages

Original

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Document:	Compaq Storageworks Installing DIMMs in an HSG80 or HSZ80 Cache Module
Order Number:	EK-80DIM-IN
Revision:	D01
Pages:	12
Original Filename:

OCR Text

Installing DIMMs in an HSG80 or HSZ80 Cache Module
This document contains instructions to replace DIMMs in a cache module and to upgrade cache memory in either an
HSG80 ACS Version 8.x Array Controller or an HSZ80 ACS Version 8.x Array Controller. See the appropriate HSG80 Array
Controller ACS Version 8.x User’s Guide, HSZ80 Array Controller ACS Version 8.x User’s Guide, HSG80 Array Controller ACS
Version 8.x Maintenance and Service Guide, or HSZ80 Array Controller ACS Version 8.x Maintenance and Service Guide for
instructions on upgrading a single-controller configuration to a dual-redundant controller configuration.

MC1-3
MC1-4

MC0-1
MC0-2

MC1-3
MC1-4

MC0-1
MC0-2

~
2
3 2x
CXO5714A

1
2
3
4
5

Cache-memory power LED
External cache battery (ECB) cable
Retaining lever
Backplane connector
Dual inline memory module (DIMM)

Figure 1. HSG80 or HSZ80 Cache Module

EMU

PVA
Controller A
Controller B

Cache module A

64MB configuration (2 x 32 MB)
256 MB configuration (2 x 128 MB)

CXO6288A

Memory

DIMMs

Quantity

64 MB
128 MB

32 MB
32 MB

2
4

256 MB
512 MB

128 MB
128 MB

2
4

Cache module B
CXO6283A

Figure 2. Location of Cache Modules

128 MB configuration (4 x 32 MB)
512 MB configuration (4 x 128 MB)

Location
MC0-1 and MC1-3
MC0-1, MC0-2,
MC1-3, and MC1-4
MC0-1 and MC1-3
MC0-1, MC0-2,
MC1-3, and MC1-4

Figure 3. Cache-Module Memory Configurations
NOTE: The only valid cache-module memory configuration for
the HSG80 ACS Version 8.0 Array Controller is 128 MB (4 x 32
MB).

© Digital Equipment Computer Corporation 1999. All rights reserved.
COMPAQ and the Compaq logo Registered in the United States Patent and Trademark Office.
Windows NT® is a registered trademark of the Microsoft Corporation.

EK–80DIM–IN. D01/388625-001

Replacing DIMMs in a Cache Module

Press down on the DIMM retaining levers at either end of the
DIMM you want to remove.

Grasp the DIMM and gently remove it from the DIMM slot.

Use this procedure for the following configurations:

HSG80 ACS Version 8.x Single Controller
HSG80 ACS Version 8.0 Dual-Redundant Controller
HSZ80 ACS Version 8.x Single Controller

Installing DIMMs
Figure 3 shows the cache-module memory configurations for
both the HSG80 and HSZ80 array controllers. Use the following
steps to install DIMMS in a cache module:

Use the following steps in “Removing DIMMs” and “Installing
DIMMs” to replace DIMMs in a cache module.

NOTE: The only valid cache-module memory configuration for
the HSG80 ACS Version 8.0 Array Controller is 128 MB (4 x 32
MB).

NOTE: The new cache module must contain the same memory
configuration as the existing cache module.
Removing DIMMs
Use the following steps to remove DIMMS from a cache
module:
1.

From the host console, dismount the logical units in the
subsystem. If you are using a Windows NT® platform, shut
down the server.

If the controller is operating, connect a PC or terminal to the
controller’s maintenance port.

CAUTION: ESD can easily damage a cache module or a DIMM.
Wear a snug-fitting, grounded ESD wrist strap.
1.

Insert the DIMM straight into the socket and ensure that the
notches in the DIMM align with the tabs in the socket as
shown in Figure .

If the controller is not operating, go to step 5.
3.

Run FMU to obtain the last failure codes, if desired.

Shut down the controllers. In single controller
configurations, shut down “this controller.” In dualredundant 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 button and the
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.

Retaining
clip
(2x)

CAUTION: Electrostatic discharge (ESD) can easily damage a
cache module or a DIMM. Wear a snug-fitting, grounded ESD
wrist strap.
5.

CXO6163A

Figure 4. Inserting a DIMM into Its Slot

Disable the ECB by pressing the battery disable switch until
the status light stops blinking—about five seconds.

Press the DIMM gently until it’s seated in the socket.

Double-check to ensure both ends of the DIMM are firmly
seated in the slot and both retaining clips engage the DIMM.

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.
6.

Disconnect the ECB cable from the cache module.

Disengage both retaining levers, remove the cache module,
and place the cache module onto a grounded antistatic mat.

CAUTION: Make sure you align the cache module in the
appropriate guard rails. If you do not align the cache module
correctly, damage to the backplane can occur.
4.

Insert the new cache module into its slot and engage its
retaining levers.

CAUTION: The ECB must be disabled—the status light is not lit
and is not blinking—before connecting the ECB cable to the
cache module. Failure to disable the ECB could result in ECB
damage.
5.

Connect the ECB cable to the new cache module.

If not already connected, connect a PC or terminal to the
controller’s maintenance port.

Mount the logical units on the host. If you are using a
Windows NT platform, restart the server.

Set the subsystem date and time. In single controller
configurations, set “this controller.” In dual-redundant
controller configurations, set “this controller” and the “other
controller” with the following commands:
SET THIS_CONTROLLER TIME= dd-mmm-yyyy:hh:mm:ss
SET OTHER_CONTROLLER TIME= dd-mmm-yyyy:hh:mm:ss

Disconnect the PC or terminal from the controller’s
maintenance port.

EK–80DIM–IN. D01/388625-001

Replacing DIMMs in a Cache Module
Use this procedure for the following configurations:

Wait for FRUTIL to quiesce the device ports. After the ports
have been quiesced (this may take several minutes), FRUTIL
displays the following:

HSZ80 ACS Version 8.1 Dual-Redundant Controller

All device ports quiesced.
Remove the slot B cache module within x minutes, xx
seconds. Then disconnect the external battery, if in

Use the following steps in “Removing DIMMs” and “Installing
DIMMs” to replace DIMMS in a cache module.

use, from the cache module.

NOTE: A countdown timer allows a total of two minutes to
remove the cache module. If you exceed two minutes, “this
controller” will exit FRUTIL and resume operations.

NOTE: The new cache module must contain the same memory
configuration as the existing cache module.
Removing DIMMs
Follow these steps to remove DIMMS from a cache module:
1.

CAUTION: ESD can easily damage a cache module or a DIMM.
Wear a snug-fitting, grounded ESD wrist strap.

Connect a PC or terminal to the operational controller’s
maintenance port. The controller to which you’re connected
is “this controller”; the controller whose cache module
you’re replacing is the “other controller.”

Disable failover with the following command:

10. Disable the ECB by pressing the battery disable switch until
the status light stops blinking—about five seconds.

SET NOFAILOVER

Start FRUTIL with the following command:
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.

RUN FRUTIL

Disengage both retaining levers and partially remove the
other cache module—about half way.

Enter option 1, Replace or remove a controller or cache
module, from the FRUTIL Main menu:
FRUTIL Main Menu:
1. Replace or remove a controller or cache module

11. Disconnect the ECB cable from the cache module, remove
the cache module, and place it onto a grounded antistatic
mat.

2. Install a controller or cache module
3. Replace other cache module battery
4. Replace a PVA module
5. Replace an I/O module

12. Once the cache module is removed, FRUTIL displays the
following:

6. Set battery life to new

7. Exit

Restarting all device ports. Please wait...

Enter choice: 1, 2, 3, 4, 5, 6, or 7 -> 1

.
.

Enter option 3, Other cache module, from the Replace or
Remove Options menu to remove the other cache module:

.
Do you have a replacement cache module? Y/N

Replace or remove Options:
1. Other controller and cache module

13. Enter N(o).

2. Other controller module
4. Exit

14. Press down on the DIMM retaining levers at either end of the
DIMM you want to remove.

Enter choice: 1, 2, 3, or 4 -> 3

15. Grasp the DIMM and gently remove it from the DIMM slot.

3. Other cache module

Confirm that you want to remove the other cache module.
FRUTIL displays the following:
Remove the slot A [or B] cache module? Y/N

Enter Y(es) and press return.

Installing DIMMs
Figure 3 shows the cache-module memory configurations for
HSZ80 ACS Version 8.1 array controller. Use the following
steps to install DIMMs in a cache module.:

11. If not already done, disable the ECB to which you’re
connecting the new cache module by pressing the battery
disable switch until the status light stops blinking—about
five seconds.

CAUTION: ESD can easily damage a cache module or a DIMM.
Wear a snug-fitting, grounded ESD wrist strap.

CAUTION: The ECB must be disabled—the status light is not lit
and is not blinking—before connecting the ECB cable to the
cache module. Failure to disable the ECB could result in ECB
damage.

Insert the DIMM straight into the socket and ensure that the
notches in the DIMM align with the tabs in the socket as
shown in Figure .

12. Connect the ECB cable to the new cache module.

Press the DIMM gently until it’s seated in the socket.

Double-check to ensure both ends of the DIMM are firmly
seated in the slot and both retaining clips engage the DIMM.

CAUTION: Make sure you align the cache module in the
appropriate guard rails. If you do not align the cache module
correctly, damage to the backplane can occur.

Connect a PC or terminal to the operational controller. The
controller to which you’re connected is “this controller”; the
controller whose cache module you’re installing is the “other
controller.”

13. Insert the new cache module into its slot and engage its
retaining levers.

Start FRUTIL with the following command:

14. Enable failover, and reestablish the dual-redundant controller
configuration with the following command:

RUN FRUTIL

SET FAILOVER COPY=THIS_CONTROLLER

Enter option 2, Install a controller or cache module, from the
FRUTIL Main menu:

This command copies the subsystem’s configuration from
“this controller” to the “other controller.”

FRUTIL Main Menu:

15. Disconnect the PC or terminal from the controller’s
maintenance port.

1. Replace or remove a controller or cache module
2. Install a controller or cache module
3. Replace other cache module battery
4. Replace a PVA module
5. Replace an I/O module
6. Set battery life to new
7. Exit
Enter choice: 1, 2, 3, 4, 5, 6, or 7 ->

Enter option 3, Other cache module, from the Install Options
menu to install the other cache module:
Install Options:
1. Other controller and cache module
2. Other controller module
3. Other cache module
4. Exit
Enter choice: 1, 2, 3, or 4 ->

Confirm that you want to install the other cache module.
FRUTIL displays the following:
Insert the slot A [or B] cache module? Y/N

Enter Y(es) and press return.

10. Wait for FRUTIL to quiesce the ports. After the ports have
been quiesced (this may take several minutes), FRUTIL
displays the following:
All device ports quiesced.

NOTE: A countdown timer allows a total of two minutes to install
the cache module. If you exceed two minutes, “this controller”
will exit FRUTIL and resume operations.

EK–80DIM–IN. D01/388625-001

Replacing DIMMs in a Cache Module

Use this procedure for the following configurations:

Quiescing all device ports. Please wait...
Device Port 1 quiesced.
Device Port 2 quiesced.
Device Port 3 quiesced.
Device Port 4 quiesced.
Device Port 5 quiesced.
Device Port 6 quiesced.
All device ports quiesced.
Remove the slot A [or B] cache module within 2
minutes. Then disconnect the external battery from
the cache module.

HSG80 ACS Version 8.2 Dual-Redundant Controller
Use the following steps in “Removing DIMMs” and “Installing
DIMMs” to replace DIMMS in a cache module.
Removing DIMMs
Use the following steps to remove DIMMS from a cache
module:
1.

CAUTION: The device ports must quiesce before removing the
cache module. Failure to allow the ports to quiesce may result
in data loss. Quiescing may take several minutes.

Disable failover with the following command:
ESD can easily damage a cache module or a DIMM. Wear a
snug-fitting, grounded ESD wrist strap.

SET NOFAILOVER

Remove the program card’s ESD cover and program card.
Save them for reinstallation later.

Start FRUTIL with the following command:

NOTE: A countdown timer allows a total of two minutes to
remove the cache module. If you exceed two minutes, “this
controller” will exit FRUTIL and resume operations.

RUN FRUTIL

FRUTIL displays the following:
Do you intend to replace this controller’s cache
battery? Y/N

Enter option 1, Replace or remove a controller or cache
module, from the FRUTIL Main menu. FRUTIL displays the
Replace or Remove Options menu:

11. Disconnect the ECB cable from the cache module, remove
the cache module, and place it onto a grounded antistatic
mat.

Replace or remove Options:
1. Other controller and cache module
2. Other controller module
3. Other cache module
4. Exit
Enter choice: 1, 2, 3, or 4 ->

Once the cache module is removed, FRUTIL displays the
following:
Restarting all device ports. Please wait...
Device Port 1 restarted.
Device Port 2 restarted.
Device Port 3 restarted.
Device Port 4 restarted.
Device Port 5 restarted.
Device Port 6 restarted.
Do you have a replacement cache module? Y/N

Enter option 3, Other cache module, from the Replace or
Remove Options menu. FRUTIL displays the following:
[
[
[
[

Slot Designations
(front view)
--EMU --- ][ --PVA ---------Controller A -------------Controller B ------Cache Module A ][ Cache Module B

Disengage both retaining levers and partially remove the
cache module—about half way.

10. Disable the ECB by pressing the battery disable switch until
the status light stops blinking—about five seconds.

Enter N(o). FRUTIL displays the FRUTIL Main menu:
FRUTIL Main Menu:
1. Replace or remove a controller or cache module
2. Install a controller or cache module
3. Replace a PVA module
4. Replace an I/O module
5. Exit
Enter choice: 1, 2, 3, 4, or 5 ->

Enter Y(es) and press return. FRUTIL displays the
following:

]
]
]
]

12. Enter N(o).
13. Press down on the DIMM retaining levers at either end of the
DIMM you want to remove.

Remove the slot A [or B] cache module? Y/N

14. Grasp the DIMM and gently remove it from the DIMM slot.

Installing DIMMs
Figure 3 shows the cache-module memory configurations for
both the HSG80 and HSZ80 array controllers. Use the following
steps to install DIMMs in a cache module:

Quiescing all device ports. Please wait...
Device Port 1 quiesced.
Device Port 2 quiesced.
Device Port 3 quiesced.
Device Port 4 quiesced.
Device Port 5 quiesced.
Device Port 6 quiesced.
All device ports quiesced.
.
.
.
Perform the following steps:
1. Turn off the battery for the new cache module by
pressing the battery's shut off button for five
seconds
2. Connect the battery to the new cache module.
3. Insert the new cache module in slot A [or B]
within 2 minutes.

CAUTION: ESD can easily damage a cache module or a DIMM.
Wear a snug-fitting, grounded ESD wrist strap.
1.

Insert the DIMM straight into the socket and ensure that the
notches in the DIMM align with the tabs in the socket as
shown in Figure .

Press the DIMM gently until it’s seated in the socket.

Double-check to ensure both ends of the DIMM are firmly
seated in the slot and both retaining clips engage the DIMM.

If not already connected, connect a PC or terminal to the
operational controller. The controller to which you’re
connected is “this controller”; the controller whose cache
module you’re installing is the “other controller.”

NOTE: A countdown timer allows a total of two minutes to install
the cache module. If you exceed two minutes, “this controller”
will exit FRUTIL and resume operations.

Start FRUTIL with the following command:

10. Disable the ECB to which you’re connecting the new cache
module by pressing the battery disable switch until the status
light stops blinking—about five seconds.

RUN FRUTIL

FRUTIL displays the following:
Do you intend to replace this controller’s cache
battery? Y/N

CAUTION: The ECB must be disabled—the status light is not lit
and is not blinking—before connecting the ECB cable to the
cache module. Failure to disable the ECB could result in ECB
damage.

11. Connect the ECB cable to the new cache module.
CAUTION: Make sure you align the cache module in the
appropriate guard rails. If you do not align the cache module
correctly, damage to the backplane can occur.

Enter option 2, Install a controller or cache module, from the
FRUTIL Main menu. FRUTIL displays the Install Options
Menu:
Install Options:
1. Other controller and cache module
2. Other controller module
3. Other cache module
4. Exit
Enter choice: 1, 2, 3, or 4 ->

Enter Y(es) and press return. FRUTIL displays the
following:

12. Insert the new cache module into its slot and engage its
retaining levers.
NOTE: In mirrored mode, FRUTIL will initialize the mirrored
portion of the new cache module, check for old data on the
cache module, and then restart all device ports. After the device
ports have been restarted, FRUTIL will test the cache module
and the ECB. After the test completes, the device ports will
quiesce and a mirror copy of the cache module data will be
created on the newly installed cache module.

Enter option 3, Other cache module, from the Install Options
menu. FRUTIL displays the following:
Insert the slot A [or B] cache module? Y/N

EK–80DIM–IN. D01/388625-001

FRUTIL displays the following:
The configuration has two controllers.
To restart the other controller:
1. Type ’restart other_controller’.
2. Press and hold the reset button while inserting
the program card on the slot A [or B] controller,
then release the reset button.
The controller will restart.
Field Replacement Utility terminated.

13. To allow the “other controller” to restart, enter the following
command:
RESTART OTHER _CONTROLLER

14. Hold the reset button while inserting the program card into
the controller. Release the reset button and replace the ESD
cover. The controller will restart.
15. Enable failover, and re-establish the dual-redundant
controller configuration with the following command:
SET FAILOVER COPY=THIS_CONTROLLER

This command copies the subsystem’s configuration from
“this controller” to the “other controller.”
16. Disconnect the PC or terminal from the controller’s
maintenance port.

Replacing DIMMs in a Cache Module

Use this procedure for the following configurations:

HSG80 ACS Version 8.3 Dual-Redundant Controller
HSG80 ACS Version 8.4 Dual-Redundant Controller
HSZ80 ACS Version 8.3 Dual-Redundant Controller
Use the following steps in “Removing DIMMs” and “Installing
DIMMs” to replace DIMMS in a cache module.
Removing DIMMs
Use the following steps to remove DIMMS from a cache
module:
1.

Disable failover with the following command:

Enter Y(es) and press return. FRUTIL displays the
following:

CAUTION: The device ports must quiesce before removing the
cache module. Failure to allow the ports to quiesce may result
in data loss. Quiescing may take several minutes.
ESD can easily damage a cache module or a DIMM. Wear a
snug-fitting, grounded ESD wrist strap.

SET NOFAILOVER

NOTE: A countdown timer allows a total of two minutes to
remove the cache module. If you exceed two minutes, “this
controller” will exit FRUTIL and resume operations.

Start FRUTIL with the following command:
RUN FRUTIL

FRUTIL displays the following:

Disengage both retaining levers and partially remove the
cache module—about half way.

Disable the ECB by pressing the battery disable switch until
the status light stops blinking—about five seconds.

Do you intend to replace this controller’s cache
battery? Y/N

Enter option 1, Replace or remove a controller or cache
module, from the FRUTIL Main menu. FRUTIL displays the
Replace or Remove Options menu:

10. Disconnect the ECB cable from the cache module, remove
the cache module, and place it onto a grounded antistatic
mat.

Replace or remove Options:
1. Other controller and cache module
2. Other controller module
3. Other cache module
4. Exit
Enter choice: 1, 2, 3, or 4 ->

Enter option 3, Other cache module, from the Replace or
Remove Options menu. FRUTIL displays the following:
[
[
[
[

Slot Designations
(front view)
--EMU --- ][ --PVA ---------Controller A -------------Controller B ------Cache Module A ][ Cache Module B

]
]
]
]

11. Enter N(o).
12. Press down on the DIMM retaining levers at either end of the
DIMM you want to remove.

Remove the slot A [or B] cache module? Y/N

13. Grasp the DIMM and gently remove it from the DIMM slot.

EK–80DIM–IN. D01/388625-001

Installing DIMMs
Figure 3 shows the cache-module memory configurations for
both the HSG80 and HSZ80 array controllers. Use the following
steps to install DIMMs in a cache module:

Quiescing all device ports. Please wait...
Device Port 1 quiesced.
Device Port 2 quiesced.
Device Port 3 quiesced.
Device Port 4 quiesced.
Device Port 5 quiesced.
Device Port 6 quiesced.
All device ports quiesced.
.
.
.
Perform the following steps:
1. Turn off the battery for the new cache module by
pressing the battery's shut off button for five
seconds
2. Connect the battery to the new cache module.
3. Insert the new cache module in slot A [or B]
within 2 minutes.

CAUTION: ESD can easily damage a cache module or a DIMM.
Wear a snug-fitting, grounded ESD wrist strap.
1.

Insert the DIMM straight into the socket and ensure that the
notches in the DIMM align with the tabs in the socket as
shown in Figure .

Press the DIMM gently until it’s seated in the socket.

Double-check to ensure both ends of the DIMM are firmly
seated in the slot and both retaining clips engage the DIMM.

NOTE: A countdown timer allows a total of two minutes to install
the cache module. If you exceed two minutes, “this controller”
will exit FRUTIL and resume operations.

Start FRUTIL with the following command:

10. Disable the ECB to which you’re connecting the new cache
module by pressing the battery disable switch until the status
light stops blinking—about five seconds.

RUN FRUTIL

FRUTIL displays the following:
Do you intend to replace this controller’s cache
battery? Y/N

CAUTION: The ECB must be disabled—the status light is not lit
and is not blinking—before connecting the ECB cable to the
cache module. Failure to disable the ECB could result in ECB
damage.

Enter Y(es) and press return. FRUTIL displays the
following:

Enter option 3, Other cache module, from the Install Options
menu. FRUTIL displays the following:
Insert the slot A [or B] cache module? Y/N

13. FRUTIL will restart the other controller. FRUTIL displays
the following:
Please wait . . .
If the other controller did not restart, press its
reset button.
Field Replacement Utility terminated.

14. If the other controller did not restart, press its reset button.
15. Enable failover, and re-establish the dual-redundant
controller configuration with the following command:
SET FAILOVER COPY=THIS_CONTROLLER

This command copies the subsystem’s configuration from
“this controller” to the “other controller.”
16. Disconnect the PC or terminal from the controller’s
maintenance port.

EK–80DIM–IN. D01/388625-001

Upgrading Cache Memory in an HSG80 or an
HSZ80 Controller

10. Insert the replacement DIMM straight into the socket and
ensure that the notches in the DIMM align with the tabs in
the socket.

Figure 3 shows the cache-module memory configurations for
both the HSG80 and HSZ80 array controllers. In order to
upgrade cache memory, the controller must be shutdown. Use
the following steps to replace DIMMS in a cache module:

11. In a dual-redundant controller configuration, repeat steps 4
through 10, as appropriate, for the other cache module.
NOTE: In a dual-redundant controller configuration, both cache
modules must contain the same memory configuration.

NOTE: The cache memory for the HSG80 ACS Version 8.0
controller cannot be upgraded. The only valid cache-module
memory configuration for this controller is 128 MB (4 x 32 MB).

CAUTION: Make sure you align the cache module in the
appropriate guide rails. If you do not align the module correctly,
damage to the backplane can occur.

From the host console, dismount the logical units in the
subsystem. If you are using a Windows NT platform, shut
down the server.

If the controller is operating, connect a PC or terminal to the
controller’s maintenance port.

12. Insert the cache module into its slot and engage its retaining
levers.

13. Connect the ECB cable to the cache module.
14. In a dual-redundant controller configuration, repeat steps 12
and 13, as appropriate, for the other cache module.
15. Mount the logical units on the host. If you are using a
Windows NT platform, restart the server.

SHUTDOWN OTHER_CONTROLLER

16. Set the subsystem date and time. In single controller
configurations, set “this controller.” In dual-redundant
controller configurations, set “this controller,” and the “other
controller” with the following command:

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.

SET THIS_CONTROLLER TIME= dd-mmm-yyyy:hh:mm:ss
SET OTHER_CONTROLLER TIME=dd-mmm-yyyy:hh:mm:ss

CAUTION: ESD can easily damage a cache module or a DIMM.
Wear a snug-fitting, grounded ESD wrist strap.
4.

17. Disconnect the PC or terminal from the controller’s
maintenance port.

Disable the ECB for the cache module you will be adding or
replacing DIMMS in 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.

Disconnect the ECB cable from the cache module.

Disengage both retaining levers, remove the cache module,
and place the cache module onto a grounded antistatic mat.

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.

If you are replacing DIMMs, press down on the DIMM
retaining levers at either end of the DIMM you want to
remove.

Grasp the DIMM and gently remove it from the DIMM slot.