PowerHA June enhancements include the following. 1. Reduced data transfer with Geographic Mirroring compression and 2. Enhanced FlashCopy automation in environments with Geographic Mirroring.

PowerHA now includes several additional enhancements including:

Reduced Data Transfer with Geographic Mirroring Compression

Geographic mirroring performs disk-level replication. This means that all changes on disk in an Independent Auxiliary Storage Pool (IASP) are replicated over the TCP/IP network to the target system. When PowerHA performs a synchronization, either for the initial synchronization, after an unplanned failure, or when resuming from a suspend operation, PowerHA replicates data over the TCP/IP network.

With this enhancement, PowerHA can now compress geographic mirroring data during resynchronization reducing the data transfer required. In addition, on Power10 systems, PowerHA uses the on-chip NX GZIP accelerator if the NX feature is enabled, providing hardware accelerated compression.

Enabling Geographic Mirroring Compression

With new environments, transmission compression can be enabled on the Configure Geographic Mirroring (CFGGEOMIR) command by specifying *RESYNC for the transmission compression attribute. For example, when configuring asynchronous geographic mirroring for the IASP, MYIASP, the following command enables geographic mirroring compression:

CFGGEOMIR ASPDEV(MYIASP) ACTION(*CREATE) DELIVERY(*ASYNC) COMPRESS(*RESYNC)

In existing environments, geographic mirroring compression can be enabled by changing the transmission compression attribute on the auxiliary storage pool session. For example, the following command enables compression for the session named GEOMIRSSN:

CHGASPSSN SSN(GEOMIRSSN) OPTION(*CHGATTR) COMPRESS(*RESYNC)

Tip: This attribute can be changed even when the production copy of the independent auxiliary storage pool (IASP) is online.

Determining if Geographic Mirroring Compression is Enabled

The following interfaces provide information to determine if transmission compression is enabled:

Geographic Mirroring FlashCopy Automation

The Spectrum Virtualize (SVC) based FlashCopy automation integrated into PowerHA now includes additional automation at the target system of Geographic Mirroring, eliminating the need to manually suspend or detach the geographic mirroring replication as part of the FlashCopy process.

The following operations are now automated:

Enhancement Availability

Release

PTF

7.5 PowerHA

SI80111

7.4 PowerHA

SI80035

7.2 PowerHA (for IBM i 7.2 and 7.3)

SI80112

note

Note: Above are highlights from this release. See the PowerHA Release notes for the full list of fixes and enhancements.

Note: Above are highlights from this release. See the PowerHA Release notes for the full list of fixes and enhancements.