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There are no serviceable parts in a E-DDM CRU. If it fails, it must be replaced in its
entirety. The EXP810 E-DDM option/FRU is not interchangeable with the drive tray
of other DS4000 storage expansion enclosures such as the EXP100 and EXP710.
When replacing a E-DDM CRU, be sure to order and install the correct E-DDM
CRU.
Attention:
1. After you remove a drive CRU, wait 70 seconds before replacing or reseating
2. Never hot-swap a drive CRU when its associated green Activity LED is flashing.
Note: If the E-DDM you want to remove is not in a failed or bypass state, always
Environmental Service Modules (ESMs)
The EXP810 has two hot-swappable and redundant ESM units. The ESMs are
located at the back of the storage expansion enclosure. The left ESM is labeled
ESM A, and the right ESM is labeled ESM B. One ESM will continue to operate if
the other ESM fails.
The ESMs contain the storage expansion enclosure control logic, interface ports,
and LEDs. Each ESM has four SFP module ports that you could use to connect the
storage expansion enclosure to the controller. However, only the two ESM SFP
ports (labeled 1A and 1B) near the center of the storage expansion enclosure are
used. The SFP ports labeled 2A and 2B are reserved for future use.
The EXP810 ESMs support automatic ESM firmware synchronization. This function
allows a new ESM with a different level of ESM firmware to be automatically
synchronized with the ESM firmware version in the existing ESM in the EXP810
chassis. To enable automatic ESM firmware synchronization:
1. Verify that the DS Storage Manager Event Monitor is installed and running.
2. Verify that the DS4000 storage subsystem that the EXP810 is attached to is
Although both ESM units (A and B) are identical, they are seated in the EXP810
chassis in opposite orientations. See Figure 2 on page 6. If the ESM cannot fully be
inserted in the ESM bay, flip it 180 degrees and reinsert it.
Connectors, switch, and enclosure ID
The ESMs support fibre optic interfaces for both the host channels and drive
channels. The two interface ports located near the enclosure ID are reserved for
future use. Do not plug any SFPs into these ports.
The enclosure ID, comprised of a pair of seven-segment numbers, is located on the
back of each ESM next to the ESM indicator lights. 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 subsystem. The storage
management software automatically sets the enclosure ID number. You can only
the drive CRU to allow the drive to properly spin down. Failure to do so may
cause undesired events.
Hot-swap a drive CRU only when its associated amber Fault LED lights is not
flashing or when the drive is inactive and its associated green Activity LED lights
is not flashing.
use the DS Storage Manager client program either to place the E-DDM in a
failed state or to place the array that is associated with the E-DDM (or
E-DDMs) in an offline state before you remove it from the enclosure.
defined in the Enterprise Management window of the DS Storage Manager
client (SMclient).
5
Chapter 1. Introduction
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