Expanding and extending capacity, Expanding and extending capacity -8 – HP StorageWorks 500 Modular Smart Array User Manual
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Configuration and Utilities
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HP StorageWorks Modular Smart Array 500 System User Guide
Expanding and Extending Capacity
CAUTION: Back up all data before removing drives or changing configurations.
Failure to do so could result in permanent loss of data. Before moving drives and
arrays, run ACU.
Array Capacity Expansion is the addition of physical drives to an array that has
already been configured. The capacity of these added physical drives may then
be added to an existing logical drive on the array (capacity extension; refer to the
next paragraph), or it may be configured into a new logical drive.
Logical Drive Capacity Extension is the enlargement of an existing logical
drive after the corresponding array has undergone capacity expansion.
Use ACU to perform capacity expansion and extension. A data backup and
restoration cycle is not required, even in non-fault-tolerant configurations.
With hot-plug drives, you can perform expansion online. Online extension is only
possible with operating system support.
IMPORTANT: When extending a logical drive under Microsoft Windows 2000, upgrade the
disk to DYNAMIC before creating a partition on that disk. If the disk already has a partition
when it is upgraded to DYNAMIC, Windows 2000 may not allow logical drive extension. Refer
to the Windows 2000 documentation for details about DYNAMIC and BASIC disks.
IMPORTANT: Microsoft Windows NT 4.0 only allows four partitions on each logical drive.
Additional drive space created may not be accessible if the four partitions per logical drive limit
are exceeded.
IMPORTANT: If you are running Microsoft Windows 2000 with Microsoft Cluster Services
(MSCS), logical drive extensions are not recommended. MSCS requires that disks be
configured as BASIC in logical disk manager. In order to take advantage of logical drive
extension, the drives would have to be configured as DYNAMIC when the volume is initially
created. Because of the differences in requirements for MSCS and the logical drive extension
feature, we recommend you do not perform a logical drive extension on a storage enclosure
that is part of a Microsoft Cluster.