IBM DS3950, Installation, User'S, And Maintenance Manual

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Working with hot-swap E-DDMs
This section explains how you can increase the storage subsystem 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:
v
Read the safety and handling guidelines in “Safety” on page xi and in
“Handling static-sensitive devices” on page 29.
v
Ensure that your current system configuration is working properly.
v
Back up all important data before you make changes to data storage devices.
v
Ensure that you wear an anti-static wrist strap.
Before you install or remove E-DDM CRUs, review the following information:
v
Blank trays: A storage subsystem 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 an E-DDM CRU inserted.
v E-DDM CRUs:
– The DS3950 storage subsystem supports 4 Gbps Fibre Channel, FC-SAS, and
SATA E-DDMs. The link rate setting speed must be set accordingly. See
“Verifying the link rate setting” on page 138 for more information.
– When adding E-DDM CRUs, if you are not installing all 16 E-DDM CRUs
into the storage subsystem, install the E-DDM CRUs from left to right
consecutively.
– For optimum performance, never insert an E-DDM into a storage subsystem
without first confirming the drive firmware level. In the event of a drive
firmware mismatch, schedule down time as soon as possible to upgrade the
drive firmware to the same version. For information about supported drive
firmware versions, refer to the IBM Storage Systems support Web site:
http://www.ibm.com/systems/support/storage/disk
– Use of non-supported drives in the drive modules can cause the storage
subsystem to fail.
Latch
drive bay slots
Raised
buttons
Slightly press here
while pushing the
lever down to lock
the drive
dcsi0036
Figure 78. Inserting a hard disk drive into the connector
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide