Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

36 Understanding ISP
About ISP concepts
About storage pools
A storage pool is defined within a disk group in VxVM for use by ISP. A storage
pool is a policy-based container for LUNs and volumes. This means that the
templates, capabilities and policies that are associated with a storage pool define
how storage is organized within the pool.
Two types of storage pool are defined: data pools and clone pools.
For convenience, storage pool definitions are provided that include a number of
associated templates that can be used for different purposes.
See “Storage pool” on page 191.
About data pools
A data storage pool is the first storage pool that is created within a disk group.
All other storage pools that are subsequently created within a disk group are
clone pools.
Note: Only one data pool can be created within a disk group.
It should not usually be necessary to move a data pool to another disk group.
However, if this is required, only an entire data pool can be moved. An individual
application volume within a data pool cannot be moved. If you want to move a
data pool into a different disk group, you must ensure that the data pool
contains only those objects that you require.
About clone pools
A clone storage pool contains one or more full-sized instant volume snapshot
replicas of volumes within a data pool. (A volume snapshot is an image of a
volume’s contents at the moment in time that the snapshot was taken. See the
Veritas Volume Manager Administrator’s Guide for more information about
volume snapshots.)
Note: Full-sized, linked break-off and space-optimized instant snapshots are
supported for use with ISP. Third-mirror break-off volume snapshots are not
supported.
In release 5.0 of VxVM, the introduction of linked break-off snapshot volumes
means that it is unnecessary to set up a clone pool. A linked break-off snapshot
volume can have different layout and characteristics from its parent volume, it
can be set up in a data pool in a different disk group, and it retains its identity if
it is relinked to its parent volume and subsequently broken off again.