This is the second release candidate for Tentacle. Ubuntu 22.04, 24.04 and CentOS 9 and Rocky 10 were built for this RC0 Feature highlights: * RADOS: New features include long expected performance optimizations (FastEC) for EC pools, including partial reads and partial writes. There is a new implementation of the Erasure Coding I/O code which provides substantial performance improvements and some capacity improvements. The new code is designed to optimize performance when using Erasure Coding with block storage (RBD) and file storage (CephFS) but will have some benefits for object (RGW) storage, in particular when using smaller sized objects. A new flag allow_ec_optimizations needs to be set on each pool to switch to using the new code, existing pools can be upgraded once the OSD and MON daemons have been updated; there is no need to update the clients. The default erasure code plugin has been switched from Jerasure to ISA-L. Users can also expect to see BlueStore improvements such as compression and a new, faster WAL (write-ahead-log). Additional improvements include switching all components to the faster OMAP iteration interface, bypassable ceph_assert()s, fixed mclock bugs and configuration defaults, and testing improvements for dencoding verification. Data Availability Score: Users can now track data availability score for each pool in their cluster. This feature is currently in tech preview.A pool is considered unavailable if any PG in the pool is not in active state or if there are unfound objects. Otherwise the pool is considered available. The score is updated every one second by default. The feature is on by default. * MGR: Highlights include the ability to force-disable always-on modules and the removal of the restful and zabbix modules (both deprecated since 2020). Note that the dashboard module's richer and better-maintained RESTful API can be used as an alternative to the restful module, and the prometheus module can be used as an alternative monitoring solution for zabbix. * RGW: Multiple fixes: Lua scripts will not run against health checks, properly quoted ETag values returned by S3 CopyPart, PostObject and CompleteMultipartUpload responses. * RGW: IAM policy evaluation now supports conditions ArnEquals and ArnLike, along with their Not and IfExists variants. * RBD: New live migration features: RBD images can now be instantly imported from another Ceph cluster (native format) or from a wide variety of external sources/formats with the help of the new NBD stream and an appropriately capable NBD server such as `qemu-nbd`. Also added support for RBD namespace remapping while mirroring between Ceph clusters, new `rbd group info` and `rbd group snap info` commands and enhanced `rbd group snap ls` command. `rbd device map` command now defaults to msgr2. * CephFS: Directories may now be configured with case-insensitive or normalized directory entry names. This is an inheritable configuration making it apply to an entire directory tree. For more information, see https://docs.ceph.com/en/latest/cephfs/charmap/ * CephFS: Modifying the FS setting variable "max_mds" when a cluster is unhealthy now requires users to pass the confirmation flag (--yes-i-really-mean-it). This has been added as a precaution to tell the users that modifying "max_mds" may not help with troubleshooting or recovery effort. Instead, it might further destabilize the cluster. * CephFS: EOPNOTSUPP (Operation not supported ) is now returned by the CephFS fuse client for `fallocate` for the default case (i.e. mode == 0) since CephFS does not support disk space reservation. The only flags supported are `FALLOC_FL_KEEP_SIZE` and `FALLOC_FL_PUNCH_HOLE`. * Dashboard: Added support for NVMe/TCP (gateway groups, multiple namespaces), multi-cluster management, oAuth2 integration, and enhanced RGW/SMB features including multi-site automation, tiering, policies, lifecycles, notifications, and granular replication. * Integrated SMB support Ceph clusters now support an smb manager module that works similarly to the existing nfs subsystem. The new smb support allows the ceph cluster to automatically create Samba-backed SMB file shares connected to CephFS. The smb module can configure both basic Active Directory domain or standalone user authentication. The Ceph cluster can host one or more virtual smb cluster which can be truly clustered using Samba's CTDB technology. The smb module requires a cephadm enabled Ceph cluster and deploys container images provided by the samba-container project. The Ceph dashboard can be used to configure smb clusters and shares. A new cephfs-proxy daemon is automatically deployed to improve the scalability and memory usage when connecting Samba to CephFS. * Git at git://github.com/ceph/ceph.git * Tarball at https://download.ceph.com/tarballs/ceph-20.1.1.tar.gz * Containers at https://quay.io/repository/ceph/ceph * For packages, see https://docs.ceph.com/en/latest/install/get-packages/ * Release git sha1: dd9c546413d50a90668289255a256022ea21f0c0