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Connecting storage expansion enclosures to the DS4500
Attention
Before powering on the DS4500 Storage Subsystem, each attached storage
expansion enclosure must be populated with at least two drives. If at least two
drives are not installed in each attached storage expansion enclosure, when
you power on the DS4500 and its attached storage expansion enclosure(s),
your standard storage partition key might be lost and must be regenerated
using instructions on the IBM DS4000 Solutions and Premium Features Web
site:
https://www-912.ibm.com/PremiumFeatures/
In addition, the resulting insufficient load to the enclosure power supplies
might cause them to intermittently appear as failed, falsely indicating the
power supplies are bad. All drives in the connected storage expansion
enclosure(s) must contain no prior configuration data.
In the initial installation of the DS4500, you can add only new storage expansion
enclosures to the DS4500 Storage Subsystem. This means that there must be no
existing configuration information on the storage expansion enclosures that you
want to install.
If the storage expansion enclosures that you want to install currently contain logical
drives or configured hot spares, and you want them to be part of the DS4500
Storage Subsystem configuration, refer to the IBM System Storage DS4000 Hard
Drive and Storage Expansion Enclosure Installation and Migration Guide. Improper
drive migration might cause loss of configuration and other storage subsystem
problems. Contact your IBM technical support representative for additional
information.
The maximum number of storage expansion enclosures that can be connected per
pair of redundant drive loops depends on the IBM DS4000 storage expansion
enclosure models used. The following DS4000 storage expansion enclosure types
are supported by the DS4500 Storage Subsystem:
v FAStT EXP500
v DS4000 EXP700
v DS4000 EXP710
v DS4000 EXP100
v DS4000 EXP810
If the drives are configured using only EXP700, EXP710, EXP100, or EXP810
storage expansion enclosures, the DS4500 Storage Subsystem supports a
maximum of 224 hard drives.
If the drives are configured using only FAStT EXP500 storage expansion
enclosures, the DS4500 Storage Subsystem supports a maximum of 220 hard
drives.
Chapter 3. Cabling the storage subsystem 61