HP 3PAR InForm OS 3.1.1 MU1 Release Notes

Before downgrading from InForm OS 3.1.1 to InForm OS 2.3.1, ensure that all read/write
snapshots are removed from Remote Copy groups.
Issues Preventing Downgrades from InForm OS release 3.1.1 to InForm OS release 2.2.4
These issues will prevent an HP 3PAR Storage System from downgrading from InForm OS release
3.1.1 to InForm OS release 2.2.4.
• Dual SD Space - As of InForm OS 2.3.1, Thin Provisioned virtual volumes can have two Snap
Data (SD) volumes. This is not a supported feature in previous InForm releases. Prior to a
downgrade, dual SD TPVVs must be converted to single SD TPVVs by removing all of the
snapshots for those TPVVs.
• RAID Multi-Parity (MP) - InForm OS releases prior to 2.3.1 do not support RAID MP; therefore,
any RAID MP Logical Disks (LDs) must be tuned to a supported RAID type or removed prior to
downgrade.
• SD Reclaim Space - SD Reclamation is not supported by previous InForm OS releases. Prior
to a downgrade, SD volumes that has its space reclaimed must be removed. If that SD is used
by snapshots only, then all of its snapshots must be deleted so that SD can be freed. If that
SD space is used by the TPVV itself, then that TPVV would need to be copied over to a new
single SD TPVV. After the copy operation completed, the original TPVV can be removed.
• 256 Read/Write Snapshots - As of InForm OS 2.3.1, the number of read/write snapshots was
increased to 256 per virtual volume. Previous releases supported a smaller maximum number
of read/write snapshots per virtual volume. A downgrade will be prevented if any virtual
volume has more read/write snapshots than the maximum supported on the previous release.
When enough snapshots have been removed to meet this criterion the downgrade is allowed.
• Multiple Read/Write Snapshots per Read-Only Snapshot - As of InForm OS 2.3.1, the creation
of multiple read/write snapshots per read-only snapshot is permitted. Previous releases
supported a single read/write snapshot per read-only snapshot. A downgrade will be prevented
if any read-only snapshot has more than one read/write snapshot. Once enough read/write
snapshots have been removed to meet this criteria, the downgrade is allowed.
• Synchronous Long Distance Remote Copy - If there are Remote Copy groups configured with
multiple targets, those groups must be removed or reduced to a single target before a
downgrade is allowed.
• 16 TB Support - Virtual volumes larger than the maximum size supported in a previous release
must be removed before a downgrade is allowed.
• Multiple Remote Copy Links per Node - As of InForm OS release 2.3.1, multiple Remote Copy
links are allowed to be configured on a individual node. Previous releases only allowed a
single link per node. Before downgrading, ensure that additional Remote Copy links are
dismissed to ensure a valid configuration for the downgrade. A check is run prior to downgrade
to validate the existing Remote Copy link configuration.
Known Issues with the InForm OS 19