IBM DCS3860, Installation, User'S, And Maintenance Manual

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The condition of the battery is indicated by an LED on the rear of the controller
(see “Controller LEDs” on page 62 for the location of the battery fault LED and
conditions that the LED indicates). You can also check the status of the battery
using the IBM DS Storage Manager.
Environmental Service Modules (ESMs)
The ESMs are at the back of the EXP3800 expansion enclosure. The ESM in SBB A
is called ESM A, while the ESM in SBB B is called ESM B. One ESM continues to
operate if the other ESM fails.
Note:
To preserve the optimal airflow, do not remove a failed ESM FRU from the
DCS3860 chassis until you are ready to replace it with a new FRU.
The ESMs contain the storage expansion enclosure control logic, interface ports,
and LEDs. Each ESM has two 6 Gbps x4 SAS IN ports and a single 6 Gbps x4 SAS
OUT port. The SAS IN ports are used to connect the ESM to a RAID controller or
another ESM. The SAS OUT port is used to cascade that ESM to another enclosure.
The use of both ports on each ESM results in a redundant drive connection.
Figure 6 shows the location of the SAS IN and OUT ports on the ESMs.
The DCS3860 ESMs support automatic ESM firmware synchronization. With this
function, a new ESM with a different version of ESM firmware can automatically
synchronize with the firmware version of the existing ESM in the enclosure. To
enable automatic ESM firmware synchronization, ensure that:
1.
The IBM DS Storage Manager Event Monitor is installed and running.
2. The storage system is defined in the Enterprise Management window of the
IBM DS Storage Manager client (SMclient).
Enclosure ID
Each controller and ESM contain two 7-segment numeric LED displays. These
LEDs provide enclosure identification and diagnostic data. The two digits that
comprise the enclosure ID are referred to as x10 and x1 digits. The enclosure ID
provides a unique identifier for each enclosure in the storage system.
IBM DS Storage Manager automatically sets the enclosure ID for each controller.
You can change the enclosure ID setting through IBM DS Storage Manager only.
dcsi0002
1 2
Lnk Lnk Lnk Lnk
ID/Diag
Lnk Lnk
8 8
1 2
Lnk Lnk Lnk Lnk
ID/Diag
Lnk Lnk
8 8
AC DC
2
1
I
O
AC DC
2
1
I
O
SAS out connector SAS in connector 2 SAS in connector 1
Figure 6. ESM SAS port locations
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IBM System Storage DCS3860 Storage System: Installation, User's, and Maintenance Guide