Chapter 4. Technology previews
This section provides an overview of Technology Preview features introduced or updated in this release of Red Hat Ceph Storage.
Technology Preview features are not supported with Red Hat production service level agreements (SLAs), might not be functionally complete, and Red Hat does not recommend using them for production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.
For more information on Red Hat Technology Preview features support scope, see the Technology Preview Features Support Scope
HA backed NFS for improved availability of NFS deployments
With this release, NFS is backed by HA to improve availability of NFS deployments. You can deploy NFS backed by haproxy and keepalived. If the placement specifies more hosts, but limits the number of hosts being used with the count property, NFS daemons are deployed on other hosts when an NFS host goes offline.
See Management of NFS Ganesha gateway using the Ceph orchestrator for more details.
4.1. Ceph Object Gateway
Ceph Object Gateway technology preview support for S3 transparent encryption
With this release, Ceph Object Gateway provides technology preview support for S3 transparent encryption using SSE-S3 and S3 PutBucketEncryption APIs.
4.2. RADOS Block Device
librbd plugin named persistent write log cache to reduce latency
With this release, the new librbd plugin named Persistent Write Log Cache (PWL) provides a persistent, fault-tolerant write-back cache targeted with SSD devices. It greatly reduces latency and also improves performance at low io_depths. This cache uses a log-ordered write-back design which maintains checkpoints internally, so that writes that get flushed back to the cluster are always crash consistent. Even if the client cache is lost entirely, the disk image is still consistent; but the data will appear to be stale.
