Storage Subsystem Behavior When Turning On The Power With No Drives Attached; Performing An Upgrade - IBM System Storage DCS Series Installation And Migration Manual

With gen2 controllers, hard disk drive and storage enclosure
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Storage subsystem behavior when turning on the power with
no drives attached
The storage subsystem controllers use the metadata (DACstor) that is stored on the
hard disk drives to synchronize. When the controllers are started with no hard disk
drives attached, they are in a split brain condition. The storage subsystem is shown
on the Enterprise Management window as a single entity. However, the controller
firmware cannot be upgraded when the controller boots with no hard disk drives.
To upgrade the controller, obtain two new hard disk drives to bring the storage
subsystems into Optimal state with hard disk drives attached (you do not need to
upgrade the controller firmware in all cases).

Performing an upgrade

To upgrade a storage subsystem in a configuration, complete the following steps.
Note:
1. Ensure that the data in the existing configuration is backed up in a secure place
2. For more information about performing an upgrade, see "Upgrade
1. Planning the upgrade.
46
IBM System Storage DCS Series with Gen2 controllers Hard Disk Drive and Storage Enclosure Installation and Migration
Guide
The new storage subsystem retains the SAFE ID of the original storage
subsystem. It also retains all of the features that were previously enabled on the
original storage subsystem. However, the features are set to Out of Compliance
state. As a result, the system sends alert notices and establishes a Needs
Attention condition. Also, any features that are marked in the NVSRAM for
automatic enablement in the new controller are enabled, although their feature
states are also set to Out of Compliance state. You must re-enable the premium
features with the premium feature SAFE key files. Also, to generate new SAFE
keys, go to https://www-912.ibm.com/PremiumFeatures/jsp/keyPrereq.jsp.
Because IBM assigns premium feature entitlements only to specific storage
subsystems, you must purchase the applicable entitlements for the new storage
subsystem to enable all of the premium features that were previously enabled on
the original storage subsystem. This SAFE ID is shown in the storage subsystem
profile as a feature enable identifier. See Table 10 on page 45.
before you start the upgrade procedure.
considerations" on page 41.
To plan the upgrade, complete the following steps:
a. See "Supported upgrades" on page 43 to determine whether the new
storage subsystem controller is a supported replacement for the original
storage subsystem controller. However, you must submit a request for price
quote (RPQ) if the new storage subsystem controller model is not a
supported replacement.
b. Purchase the premium feature entitlements that are enabled in the original
storage subsystem for the new storage subsystem, if that premium feature is
not standard in the new storage subsystem.
c. Purchase the host attachment entitlement kits for the new storage
subsystem.
d. Purchase additional storage enclosures, if the original storage subsystem
integrates the drives and controllers and the new storage subsystem model
contains the controllers only.
e. Lay out the storage enclosure cabling to the new storage subsystem, if the
cabling is different from that of the original storage subsystem. See the

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