Resetting The Battery Age; Removing Persistent Reservations; Synchronizing The Controller Clocks; Locating Disk Drives - IBM System Storage DS3000 Programming Manual

Resetting the Battery Age

After you have replaced the batteries in the storage subsystem, you must reset the age of the battery. You
can reset either the batteries for an entire storage subsystem or a battery in a specific controller. To reset
the age of the batteries to zero days, use this command:
reset storageSubystem batteryInstallDate [controller=(a | b)]
Note: The DS3950, DS4800 (models 82, 84, and 88), DS5020, DS5100, and DS5300 controller modules do
not support this command. The batteries in the DS3950, DS4800 (models 82, 84, and 88), DS5020, DS5100,
and DS5300 controller modules do not require that you reset the battery age after you have replaced the
batteries.

Removing Persistent Reservations

Persistent reservations preserve logical drive registrations, and they prevent hosts, other than the host
defined for the logical drive, from accessing the logical drive. You must remove persistent reservations
before you make these changes to your configuration:
v Change or delete LUN mappings on a logical drive holding a reservation
v Delete subsystems or logical drives that have any reservations
To determine which logical drives have reservations, use this command:
show (allLogicalDrives | logicalDrive [logicalDriveName] | logicalDrives [logicalDriveName1 ...
logicalDriveNameN]) reservations
To clear persistent logical drive reservations, use this command:
clear (allLogicalDrives | logicalDrive [logicalDriveName] | logicalDrives [logicalDriveName1 ...
logicalDriveNameN]) reservations

Synchronizing the Controller Clocks

To synchronize the clocks on both controllers in a storage subsystem with the host clock, use this
command:
set storageSubsystem time

Locating Disk Drives

At times, you might need to locate a specific disk drive. In very large storage subsystem configurations,
this task can sometimes be awkward. If you need to locate a specific disk drive, you can do so by turning
on the indicator light on the front of the disk drive. To locate a disk drive, use this command:
start drive [enclosureID,slotID] locate
To turn off the indicator light after locating the disk drive, use this command:
stop drive locate

Relocating an subsystem

subsystem relocation describes the action of moving disk drives within the same storage subsystem. This
is a supported capability; however, any relocation of storage subsystem components must be completed
under the guidance of an IBM Technical Support representative.
This section describes the commands that you use to remove a set of disk drives and then reinstall them
into a different storage subsystem.
11-3
Chapter 11. Maintaining a storage subsystem