Installation/Upgrade Instructions; After You Upgrade; New In 8.0 - Utilization Computations; Compatibility/Interoperability - HP LeftHand P4000 - SAN Solutions Release Note

Installation/upgrade instructions

Please read the Upgrade Guide for instructions about installing release 8.1
You can find more information about the HP LeftHand products from the Manuals page of the HP
Business Support Center website:
http://www.hp.com/support/manuals
In the Storage section, navigate to Disk Storage Systems > LeftHand P4000 SAN Solutions and then
select your product.

After you upgrade

You will find the following changes the release 8.x software.
New in 8.0 — utilization computations
The formulas for computing snapshot and volume utilization have changed to more accurately reflect
the amount of space being used on the SAN.
Pre-8.0 utilization formulas
Utilization was computed as
(Used Space of snapshot + Used Space of Temp Space) / (Provisionable Space
of snapshot + Provisionable Space of Temp Space).
8.0 utilization formulas
Snapshot utilization is now calculated as the used space of the snapshot divided by the provisioned
space of the snapshot:
Used Space of snapshot / Provisioned Space of snapshot.
Volume utilization is calculated as the used space of the volume divided by the provisioned space of
the volume:
Used Space of volume / Provisioned Space of volume.
For thinly provisioned volumes, utilization will vary because the volume "autogrows" as data is written
to it. As utilization approaches 100%, the volume will autogrow and the utilization percent will
decrease. This pattern of increasing utilization, autogrow, and decreasing utilization repeats over
time and volume use.

Compatibility/interoperability

For a complete list of supported SAN/iQ software releases and application software compatibility,
refer to the HP LeftHand P4000 SANs compatibility matrix (White Paper/4AA2-5654ENW.pdf).

Version requirements

To upgrade to release 8.1 SAN/iQ software, the storage nodes must be at version 7.0 or later. If
the storage nodes are at a lower version, please contact Customer Support for access to the interim
upgrade files. Refer to
8 SAN/iQ release notes
HP technical support for customer support contact information.