IBM System Storage DS3000, Programming Manual

Page: 527 / 652

drives, the subsystem information and the logical drive information on the disk drives that you move are
incomplete. Each disk drive that you move contains only part of the information that is defined for the
logical drive and the subsystem. To be able to reuse the disk drives to create a new subsystem and logical
drive, you must delete all of the old information from the disk drives by initializing the disk drive.
When you initialize a disk drive, all of the old subsystem information and logical drive information are
deleted, and the disk drive is returned to an unassigned state. Returning a disk drive to an unassigned
state adds unconfigured capacity to a storage subsystem. You can use this capacity to create additional
subsystems and logical drives.
To initialize a disk drive, use this command:
start drive [ enclosureID,slotID ] initialize
where enclosureID and slotID are the identifiers for the disk drive.
Reconstructing a Drive
If two or more of the disk drives in a subsystem have failed, the logical drive shows a status of Failed.
All of the logical drives in the subsystem are no longer operating. To return the subsystem to an Optimal
status, you must replace the failed disk drives. Then, you must reconstruct the data on the new disk
drives. The data that you reconstruct is the data as it would appear on the failed disk drives.
Important: You can use this command only when the disk drive is assigned to a RAID 1, RAID 3, RAID
5, or RAID 6 subsystem.
To reconstruct a disk drive, use this command:
start drive [ enclosureID,slotID ] reconstruct
where enclosureID and slotID are the identifiers for the disk drive.
Initializing a Logical Drive
Attention: Possible loss of data – When you initialize a logical drive, all existing data on the logical
drive and all of the information about the logical drive are destroyed. Do not use this command unless
you want to destroy all the data in the given disk drive.
A logical drive is automatically initialized when you first create it. If the logical drive starts showing
failures, you might be required to re-initialize the logical drive to correct the failure condition.
Consider these restrictions when you initialize a logical drive:
v
You cannot cancel the operation after it begins.
v
You cannot use this option if any modification operations are in progress on the logical drive or the
subsystem.
v
You cannot change the cache parameters of the logical drive while the initialization operation is in
progress.
To initialize a logical drive, use this command:
start logicalDrive [ logicalDriveName ] initialize
where logicalDriveName is the identifier for the logical drive.
Redistributing Logical Drives
When you redistribute logical drives, you return the logical drives to their preferred controller owners.
The preferred controller ownership of a logical drive or an subsystem is the controller of an active-active
pair that is designated to own the logical drives. The preferred owner for a logical drive is initially
Chapter 11. Maintaining a storage subsystem
11-15