3PAR InForm Operating System 2.3.1 MU1 Release Notes (320-200213 Rev B, May 2010)

2.10
3PAR InForm Operating System Release Notes InForm OS Version 2.3.1 MU1
2.7 Known Issues with the InForm OS
2.7.1 4Gb/s 2-Port adapter Issue
The 4Gb/s 2-port Fibre Channel Adapter firmware does not detect a loss of sync when the host
reboots and has older adapters (ex: QLA2342) that do not turn off the laser.
 Workaround - None.
2.7.2 Downgrade Issues
The following are downgrade issues for InForm OS release 2.3.1 MU1.
2.7.2.1 Issues Preventing Downgrades
These issues will prevent an InServ Storage Server from downgrading from InForm OS release
2.3.1 MU1 to 2.2.4. (These issues do not apply to a downgrade from 2.3.1 MU1 to 2.3.1.)
■ Dual SD Space - Thin Provisioned virtual volumes can have two Snap Data (SD) volumes in
2.3.1 and 2.3.1 MU1. 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) - Raid MP was not supported in InForm OS releases prior to 2.3.1,
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 InForm OS releases prior to 2.3.1.
Before a downgrade, SD volumes that have 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 - In InForm OS 2.3.1 and 2.3.1 MU1, the number of read/write
snapshots was increased to 256 per virtual volume. Previous release 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.