This is the first minor release in the Tentacle series. We recommend that all users update to this release. For detailed release notes with links & changelog please refer to the official blog entry at https://ceph.io/en/news/blog/2026/v20-2-1-tentacle-released/ Notable Changes --------------- OSD / BlueStore --------------- * EC Recovery: Fixed a length calculation bug in erase_after_ro_offset() that caused empty shards to retain data, leading to shard_size >= tobj_size assertion failures when recovering small objects in EC pools. * BlueFS Volume Selector: Updated the BlueFS volume selector to properly account for file size changes when recovering the WAL in envelope mode. * BlueFS: Fixed a bug where stat() missed the actual file size update after indexing WAL envelope files. Monitor (mon) ------------- * Fast EC Restrictions: Denied the ability to enable EC optimizations ("fast EC") for non-4K-aligned chunk sizes. Unaligned chunk sizes handled by fast EC perform poorly and suffer from bugs, so attempts to force this configuration are now rejected. * Peering: Ensured ceph pg repeer proposes a correctly sized pg temp, as optimized EC cannot cope with mismatched sizes. * NVMeoF Gateway: Added a new nvme-gw listeners command to display all existing listeners (including auto-listeners) inside a pool/group. * NVMeoF Failover: Overhauled the NVMeoF Gateway fast-failover logic. Beacon timeouts are now evaluated within prepare_beacon to support shorter intervals, and the mechanism for detecting monitor slowness was improved. librbd & rbd-mirror ------------------- * RBD: Introduced a new ``RBD_LOCK_MODE_EXCLUSIVE_TRANSIENT`` policy for ``rbd_lock_acquire()``. This is a low-level interface intended to allow a peer to grab exclusive lock manually for short periods of time with other peers pausing their activity and waiting for the lock to be released rather than instantly aborting I/O and returning an error. It's possible to switch from ``RBD_LOCK_MODE_EXCLUSIVE`` to ``RBD_LOCK_MODE_EXCLUSIVE_TRANSIENT`` policy and vice versa even if the lock is already held. Ceph Object Gateway (RGW) ------------------------- * Multi-Part Operations: Fixed conditional validation handling in MultiWrite, Delete, and MultiDelete workflows. mgr/dashboard ------------- * UI Navigation: Redesigned the main landing page; the "Dashboard" navigation item was renamed to "Overview" and uses a new carbonized productive card layout. * NVMeoF Management: Added the nvmeof get_subsystems CLI command, fixed JSON output indentation for NVMeoF CLI commands, and reverted the server_addr API parameter back to traddr for consistency. * Hosts View: Fixed a bug causing the IP addresses of hosts to be hidden on the Hosts page due to an issue with fact merging. * Forms & Modals: Standardized forms onto the Carbon Design System, including the pools form, service form, multi-site realm token export modal, delete zone modal, and password change forms. * Form Validation: Generalized form error handling and validations using a new cdValidate directive. mgr/cephadm ----------- * Monitoring Stack: Bumped the default container image versions for the monitoring stack: Prometheus to v3.6.0, Node-exporter to v1.9.1, Alertmanager to v0.28.1, and Grafana to v12.2.0. Security Changes ---------------- * Monitoring Stack Images: Updated Prometheus, Alertmanager, and Grafana container image versions, picking up upstream security and stability fixes. Configuration Changes --------------------- * ``bluefs_check_volume_selector_on_mount``: The previous bluefs_check_volume_selector_on_umount debug setting was renamed and repurposed. It now checks for volume selector inconsistencies on both mount and unmount phases. * ``mon_nvmeofgw_beacon_grace``: The default grace period before marking a gateway as failed has been reduced from 10 seconds to 7 seconds for faster failover. * ``nvmeof_mon_client_tick_period``: The default beacon tick interval has been lowered from 2 seconds to 1 second. We recommend users to update to this release. For detailed release notes with links & changelog please refer to the official blog entry at https://ceph.io/en/news/blog/2026/v20-2-1-tentacle-released/ Getting Ceph ------------ * Git at git://github.com/ceph/ceph.git * Tarball at https://download.ceph.com/tarballs/ceph-20.2.1.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: 6a49aff47758778a5f5951e731d437c317f72fb2