Red Hat fully supports persistent memory (pMEM) FS-DAX mode in RHEL 7.6 and RHEL 8.0 for SAP Solutions

Updated -

Red Hat fully supports Intel Optane DC Persistent Memory (pMEM) File System DAX (FS-DAX) as part of RHEL 7.6 and RHEL 8.0 for SAP Solutions subscriptions as follows:

  • RHEL 7.6 for SAP Solutions: for production deployments of SAP HANA 2.0 SPS 03, revision 35 (or later).
  • RHEL 8.0 for SAP Solutions: for production deployments of SAP HANA 2.0 SPS 04 (or later).

Intel Optane DC Persistent Memory devices provide data center class persistent memory technology, which is of particular interest for low latency use cases such as reducing the startup time for relational databases.

Persistent memory can be configured in one of the following ways for use by applications:

  • Block mode
  • Device DAX mode
  • FS-DAX mode

Note: FS-DAX technology remains in Technology Preview for all other RHEL 7.6 and RHEL 8.0 use cases.

The current status of persistent memory support and FS-DAX for ext4 and XFS is as follows:

  • Block Mode is fully supported in RHEL 7.3 and later.
  • Device DAX is fully supported in RHEL 7.4 and later.
  • FS-DAX for ext4 and XFS is in Technology Preview from RHEL 7.3 to RHEL 7.6
    (see the RHEL 7.6 Release Notes for more details), and full support is targeted in a future minor release of Red Hat Enterprise Linux 7.
  • FS-DAX is fully supported for production deployments of SAP HANA:
    • with RHEL 7.6 for SAP Solutions and SAP HANA SPS 03, revision 35 (or later).
    • with RHEL 8.0 for SAP Solutions and SAP HANA SPS 04 (or later).

Note: While FS-DAX is supported in RHEL 7.6 and RHEL 8.0 for SAP Solutions, SAP production support for running SAP HANA on RHEL 8.0 for SAP Solutions is still pending. SAP will inform customers of production support in SAP Note 2235581 when validation is complete.