Chapter 5. 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. See the support scope for Red Hat Technology Preview features for more details.
QoS in the Ceph OSD is based on the mClock algorithm
Previously, the scheduler defaulted to the Weighted Priority Queue (WPQ). Quality of service (QoS) based on the mClock algorithm was in an experimental phase and was not yet recommended for production.
With this release, the mClock based operation queue enables QoS controls to be applied to Ceph OSD specific operations, such as client input and output (I/O) and recovery or backfill, as well as other background operations, such as pg scrub, snap trim, and pg deletion. The allocation of resources to each of the services is based on the input and output operations per second (IOPS) capacity of each Ceph OSD and is achieved using built-in mClock profiles.
Also, this release includes the following enhancements:
Hands-off automated baseline performance measurements for the OSDs determine Ceph OSD IOPS capacity with safeguards to fallback to default capacity when an unrealistic measurement is detected. Setting sleep throttles for background tasks is eliminated. Higher default values for recoveries and max backfills options with the ability to override them using an override flag. Configuration sets using mClock profiles hide complexity of tuning mClock and Ceph parameters.
See The mClock OSD scheduler in Red Hat Ceph Storage Administration Guide for details.
Users can archive older data to an AWS bucket
With this release, users can enable data transition to a remote cloud service, such as Amazon Web Services (AWS), as part of the lifecycle configuration. See the Transitioning data to Amazon S3 cloud service for more details.
Expands the application of S3 select to Apache Parquet format
With this release, there are now two S3 select workflows, one for CSV and one for Parquet, that provide S3 select operations with CSV and Parquet objects. See the S3 select operations in the Red Hat Ceph Storage Developer Guide for more details.
Bucket granular multi-site sync policies is now supported
Red Hat now supports bucket granular multi-site sync policies. See the Using multi-site sync policies section in the Red Hat Ceph Storage Object Gateway Guide for more details.
Server-Side encryption is now supported
With this release, Red Hat provides the support to manage Server-Side encryption. This enables S3 users to protect data at rest with a unique key through Server-Side encryption with Amazon S3-managed encryption keys (SSE-S3).
Users can use the PutBucketEncryption S3 feature to enforce object encryption
Previously, to enforce object encryption in order to protect data, users were required to add a header to each request which was not possible in all cases.
With this release, Ceph Object Gateway is updated to support PutBucketEncryption S3 action. Users can use the PutBucketEncryption S3 feature with the Ceph Object Gateway without adding headers to each request. This is handled by the Ceph Object Gateway.
