HP 3PAR StoreServ 7450 4-node HP 3PAR StoreServ Storage Concepts Guide (OS 3.1 - Page 45

Virtual Volume Online Conversion, Physical Copies

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For example, if a 1 TB TPVV with read-only snapshots has a maximum write rate of 1 GB per day and you would like 30 days warning prior to that TPVV reaching the allocation limit, use the following calculation for the allocation warning percentage: Virtual Volume Online Conversion You can convert existing fully provisioned virtual volumes to Thinly Provisioned Virtual Volumes and you can convert Thinly Provisioned Virtual Volumes to fully provisioned virtual volumes on the array without disrupting normal storage system operations and without requiring changes to any host applications that access the virtual volumes. If a TPVV is using most of its allocated storage capacity, you might choose to convert the volume to a fully provisioned volume in order to increase its storage capacity and allow for continued growth of the volume. When a TPVV reaches approximately 80% of capacity, the incremental benefit of capacity savings versus accelerating performance is weighted towards performance. In addition, converting volumes from Thinly Provisioned to fully provisioned can free up Thinly Provisioned capacity for other TPVVs. Similarly, if a fully provisioned virtual volume's storage space is largely unused, you might choose to convert it to a thinly provisioned volume in order to save storage space. Converting remote copy virtual volumes and virtual volumes that contain snapshots is not supported. You can, however, convert virtual volumes with snapshots and create a new virtual volume with a new WWN that contains the original logical disks and snapshots. Converting virtual volumes can be performed with both the HP 3PAR Command Line Interface (CLI) and the HP 3PAR Management Console. Refer to the HP 3PAR Command Line Interface Administrator's Manual and the HP 3PAR Management Console Online Help for instructions on how to perform these tasks. Converting volumes from thin to full requires the HP 3PAR Dynamic Optimization license. Converting volumes from full to thin requires the HP 3PAR Dynamic Optimization Software license and HP 3PAR Thin Provisioning Software license. For more information, see "HP 3PAR Software" (page 9). Physical Copies A physical copy is a full copy of a volume. A physical copy duplicates all the data from one original base volume to another volume called the destination volume. Any changes to either volume causes them to lose synchronization with each other, which is corrected by resynchronizing the two volumes as described in the HP 3PAR Command Line Interface Administrator's Manual and the HP 3PAR Management Console Online Help. No special license is required to create a physical copy of a volume. Physical copies can be created and managed in groups to reduce the number of management tasks. You can create a consistent group of physical copies from a list of virtual volumes, and group physical copies into autonomic groups that are managed as one physical copy. A physical copy can only be made from a volume with enough free space to accommodate writes to that volume during the physical copy operation. In addition, the destination volume must meet the following conditions: • It must have snapshot space associated with it. • It must have at least as much user space as the volume being copied. • It must not be exported to a host. Virtual Volume Online Conversion 45

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For example, if a 1 TB TPVV with read-only snapshots has a maximum write rate of 1 GB per day
and you would like 30 days warning prior to that TPVV reaching the allocation limit, use the
following calculation for the allocation warning percentage:
Virtual Volume Online Conversion
You can convert existing fully provisioned virtual volumes to Thinly Provisioned Virtual Volumes
and you can convert Thinly Provisioned Virtual Volumes to fully provisioned virtual volumes on the
array without disrupting normal storage system operations and without requiring changes to any
host applications that access the virtual volumes. If a TPVV is using most of its allocated storage
capacity, you might choose to convert the volume to a fully provisioned volume in order to increase
its storage capacity and allow for continued growth of the volume. When a TPVV reaches
approximately 80% of capacity, the incremental benefit of capacity savings versus accelerating
performance is weighted towards performance. In addition, converting volumes from Thinly
Provisioned to fully provisioned can free up Thinly Provisioned capacity for other TPVVs. Similarly,
if a fully provisioned virtual volume's storage space is largely unused, you might choose to convert
it to a thinly provisioned volume in order to save storage space.
Converting remote copy virtual volumes and virtual volumes that contain snapshots is not supported.
You can, however, convert virtual volumes with snapshots and create a new virtual volume with a
new WWN that contains the original logical disks and snapshots.
Converting virtual volumes can be performed with both the HP 3PAR Command Line Interface (CLI)
and the HP 3PAR Management Console. Refer to the
HP 3PAR Command Line Interface
Administrator’s Manual
and the HP 3PAR Management Console Online Help for instructions on
how to perform these tasks.
Converting volumes from thin to full requires the HP 3PAR Dynamic Optimization license.
Converting volumes from full to thin requires the HP 3PAR Dynamic Optimization Software license
and HP 3PAR Thin Provisioning Software license.
For more information, see
“HP 3PAR Software” (page 9)
.
Physical Copies
A physical copy is a full copy of a volume. A physical copy duplicates all the data from one original
base volume
to another volume called the
destination volume
. Any changes to either volume causes
them to lose synchronization with each other, which is corrected by resynchronizing the two volumes
as described in the
HP 3PAR Command Line Interface Administrator’s Manual
and the
HP 3PAR
Management Console Online Help
. No special license is required to create a physical copy of a
volume.
Physical copies can be created and managed in groups to reduce the number of management
tasks. You can create a consistent group of physical copies from a list of virtual volumes, and group
physical copies into autonomic groups that are managed as one physical copy.
A physical copy can only be made from a volume with enough free space to accommodate writes
to that volume during the physical copy operation. In addition, the destination volume must meet
the following conditions:
•
It must have snapshot space associated with it.
•
It must have at least as much user space as the volume being copied.
•
It must not be exported to a host.
Virtual Volume Online Conversion
45