Capacity Expansion And Extension - HP 201723-B21 - StorageWorks Modular SAN Array 1000 Hard Drive Maintenance And Service Manual

8 Capacity expansion and
extension
Array expansion is the addition of physical hard drives to an array that has already been configured. The
capacity of these added physical hard drives may then be added to an existing LUN on the array or
configured into a new LUN.
LUN extension is the enlargement of an existing LUN after the corresponding array has undergone
capacity expansion.
Expansions and extensions are performed through the ACU or MSA-CLI.
If you are using hot-pluggable hard drives, expansion can be performed online (that is, without shutting
down the operating system). Online extension can only be performed if supported by the operating
system.
CAUTION:
Back up all data before removing hard drives or changing configurations. Failure to do so could result in
permanent loss of data.
NOTE:
When extending a LUN under Windows 2000, upgrade the LUN to Dynamic before creating a partition
on that LUN. If the LUN already has a partition when it is upgraded to Dynamic, Windows may not
allow LUN extension. See the Windows 2000 documentation for details about Dynamic and Basic LUNs.
NOTE:
Windows may allow only four partitions on each LUN. Additional space created may not be accessible
if the four partitions per LUN limit is exceeded.
NOTE:
If you are running Windows 2000 with Microsoft Cluster Services (MSCS), LUN extensions are not
recommended. MSCS requires that drives be configured as Basic in Logical Disk Manager. To take
advantage of LUN extension, your hard drives would have to be configured as Dynamic when the
volume is initially created. Because of the differences in requirements for the MSCS and the LUN
extension feature, HP recommends that you not perform LUN extensions on storage enclosures that are
part of a Microsoft Cluster.
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