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You can use either the Storage Subsystem Profile information or the Drive
Enclosure Component icon in the Physical View of the Subsystem Management
window to verify the EXP395 ESM firmware.

Attention:

For error-free operation, the ESM firmware in the EXP395 ESM

modules must be at the same level. If the ESM version does not match, wait at
least 10 minutes for the ESM automatic code synchronization to occur.
Otherwise, manually update the ESM firmware using the menu function in the
DS3950 Subsystem Management window.

Insert the drives into the drive slots two at a time. Wait until the drives have
spun up and been recognized by the DS3950 before inserting the next two
drives from the Physical View of the Subsystem Management window.

Repeat step1 on page 67 to step 8 for each storage expansion enclosure you
want to add.

Note:

Always add a new EXP395 to the

end

of a drive loop. Always add new

drive expansion enclosures to the existing drive loop one at a time while the
DS3950 storage subsystem is running and in an optimal state. See the

Hard

Drive and Storage Expansion Enclosure Installation and Migration Guide

for more

information.

Working with hot-swap E-DDMs

This section explains how you can increase the storage expansion enclosure
capacity by adding more E-DDMs or by replacing existing E-DDMs with ones that
have a larger capacity.

Before you begin, complete the following tasks:

Read the safety and handling guidelines in “Safety” on page ix and in
“Handling static-sensitive devices” on page 22.

Ensure that your current system configuration is working properly.

Back up all important data before you make changes to data storage devices.

Ensure that you wear an anti-static wrist strap.

Before you install or remove E-DDM FRUs, review the following information:

Blank trays:

A storage expansion enclosure without a full set of E-DDMs (16)

contains blank trays in the unused drive bays. Before installing new E-DDMs,
you must remove these empty trays. Save the empty trays for future use. Each
of the 16 bays must always contain either a blank tray or a hot-swap E-DDM.
For proper cooling and EMC protection, do not leave a drive slot open without
either a drive blank or a E-DDM FRU inserted.

E-DDM FRUs:

– IBM recommends that when adding E-DDM FRUs, if you are not installing all

16 E-DDM FRUs into the EXP395, install the E-DDM FRUs from left to right
consecutively.

– Use of non-supported drives in the storage expansion enclosures can cause

the storage expansion enclosures to fail.

– After you remove an E-DDM FRU, wait 70 seconds before replacing or

reseating it to allow it to properly spin down. Failure to do so may cause
undesired events.

– When determining what E-DDM CRU to add, there are many factors to base

your decision on in addition to the drive capacity. Here is a partial list of the
factors that differentiate a drive:

IBM System Storage DS3950 EXP395 Storage Expansion Enclosure: Installation, User’s, and Maintenance Guide