DDN Storage SFA7700 Series Guida per l'amministratore
HOW TO GUIDE
DDN TECHNICAL SUPPORT | SPT-CRU-0003 (A0) | 27 MAY 2016
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 1
SFA7700™
CMOS Coin Cell and Backup Battery
Replacement
The SFA7700 family of products includes not only the SFA7700 but also the SFA7700X and the
embedded processor systems – GS7K (integrated with GRIDScaler) and ES7K (integrated with
EXAScaler).
Each controller contains two batteries, both contained within the body of the controller:
•A battery backup pack.
•A CMOS coin cell battery.
The backup battery serves to provide enough power for the controller to safely flush its cache to the
disks in the event of a power event, thus preserving data integrity. The backup battery pack has a
useable life of three years from the date of manufacture. When the three years have passed, the SFA
OS is designed to place all pools into a write through state to guard against any loss of data.
The CMOS battery serves the same function as that found in regular consumer and enterprise PCs –
to retain certain settings in the unit’s BIOS including current time and date. Its expected life span is
approximately five years.
Because the effective life of the backup battery is less than that of the CMOS battery, most
replacements will be for the backup battery only.
WARNING: Batteries should never be replaced without first consulting DDN Support.
Electrostatic Discharge Warnings (ESD)
Because replacement of the batteries requires direct contact with sensitive interior components, it is
essential that the replacement steps be done in an ESD protected environment.
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 2
Several steps can be taken to minimize the possibility of electrostatic damage to the hardware:
•Set the controller on an anti-static mat.
•Before opening, put the included anti-static strap on the wrist and connect the grounding
wire to the chassis frame.
•Rest the entire palm on the metal casing of the controller for at least three seconds.
•Limit physical movement during the procedure to prevent possible buildup of static charge.
•Avoid coming into physical contact with any other components within the controller casing
except for those being replaced or those that require removal to facilitate the battery
replacement.
WARNING: If the directives above are not observed, damage from electrostatic charge may
not be immediately obvious, but can affect the correct operation of the system
later.
Receiving Inspection and Shipping
Take care when opening the shipping box containing the battery kit. Avoid the possibility of cutting
into the batteries with a box knife or razor.
Upon removal of the batteries, perform a visual inspection of each battery looking for tears, dents,
punctures, rips, leaks, or burns. If any damage is observed or suspected, repack in the shipping box
and contact DDN Support for return instructions and a new replacement.
Storage Recommendations
Replacement batteries should be installed as soon as possible following receipt. If immediate
replacement is not possible the following guidelines should be followed:
•Once unpacked, do not stack batteries (backup battery packs)
•Do not damage the battery’s heat shrink cover (backup battery packs and CMOS batteries)
•Keep the batteries in a cool, dry place at normal room temperature (backup battery packs
and CMOS batteries)
•Do not store in a refrigerator or freezer (backup battery packs and CMOS batteries).
The Battery Kit
The battery replacement kit includes the following items:
•1 battery backup pack
•1 CMOS coin cell battery
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 3
•1 anti-static wrist strap
•1 set of replacement warranty stickers
•1 small nylon ziptie
•1 copy of this replacement document
Required Tools
•#1 Phillips screwdriver
•Small needle nose pliers (optional)
•Small wire snipping tool
When to Replace the Backup Battery
When the backup battery nears the end of its three year life, the SFA OS will generate an alert that
the replacement date is eminent in the event log as well as the output of SHOW UPS ALL (Figure 1).
A child fault will also appear in SHOW SUB FAULT.
Figure 1
The status of the battery’s charge can also be determined visually by removing the controller and
turning it upside down to access the battery’s test button and LEDs (Figure 2).
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 4
Figure 2
Press the test button on the left side of the backup battery assembly and hold. The battery pack
LEDs light up to indicate the state of chart. The chart below explains how the state of charge
corresponds to the LED’s..
LED Status
State of Charge (SOC)
3 LEDs illuminated
90% or greater SOC
2 LEDs illuminated
50 – 89% SOC
1 LED illuminated
10 – 49% SOC
No LEDs illuminated
No charge
Identifying the Battery to be Replaced
Before beginning the replacement, identify which controller contains the expired battery:
1. Log into the system from either controller.
2. Run SHOW ENCLOSURE ALL (Figure 3). Note that in this example, the state of Battery Health
for controller 0 is REPLACEMENT REQUIRED. Note, also, that the enclosure index for this
controller is 0.
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 5
Figure 3
3. Run SHOW CONTROLLER to get the controller index (this may be different from the enclosure
index) as seen in the partial example below (Figure 4 – In this example the controller with the
aging battery is the one logged into.):
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 6
Figure 4
4. The controller can be visually identified by running the the command: LOCATE CONTROLLER
<controller ID>. The controller ID is included in the output of SHOW CONTROLLER (see
above). The example would be: SHOW CONTROLLER 0. This command will activate a blue
‘locate’ LED on the back of the controller for a specific amount of time. The default duration
is 120 seconds.
5. Using the controller index, run the shutdown command: SHUTDOWN CONTROLLER <index>
6. In this example, the command would be: SHUTDOWN CONTROLLER 0
7. Wait until the controller is completely powered off. All LED’s on the back of the controller
(except the LAN port activity lights) will be off.
Removing the Controller
1. Label and remove all cables from the back of the controller to allow free movement of the
lock bar which secures the controller (Figure 5).
Figure 5
2. Loosen the lock bar thumbscrew and pulled the lock bar down (Figure 6) while
simultaneously pulling the controller out from the enclosure.
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Figure 6
CAUTION: Use extreme care to prevent the connector pins at the back of the controller
from being bent or damaged.
3. Place the controller on a static free surface.
Opening the Controller
The outer case of the controller is secured with a total of six screws – two on the front as well as two
on either side (Figure 7).
Figure 7
4. Remove the side and front screws with a number 1 Phillips head screwdriver (Figure 8).
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 8
Figure 8
5. To free the top of the controller, lift the top at the front edge (the end with the ports) and
rotate it 90 degrees as if it were attached by a hinge (Figure 9). The left front edge of the
unit’s top must be pulled out slightly to allow the top of the controller housing to swing free.
Figure 9
6. Swing the top backward and lay flat (Figure 10).
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 9
Figure 10
CAUTION: Failure to remove the top of the controller as directed can result in damage to
the battery wires.
WARNING: The foam spacer set on top of the two internal system drives may come off when
opening the canister. If so, remember to put it back in place.
Internal Differences and Similarites Between Members of the SFA7700 Family
Although the basic components of the SFA7700 and SFA7700X / GS7K / ES7K are fundamentally
identical, there are a few differences called out in the illustrations below (Figures 11 and 12) to
prevent confusion. Because of the close similarities, the battery replacement procedure is the same
across all models of the SFA7700 family.
Figure 11 – SFA7700X / GS7K / ES7K
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Figure 12 – SFA7700
Removing and Replacing the Backup Battery Pack
Because the expected useful life of the backup battery pack is less than that of the CMOS battery,
most replacements will be for the backup battery only.
The backup battery pack is attached to the inside of the top of the controller canister (Figure 13).
Figure 13
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