# cephfs

CephFS is a POSIX-compliant filesystem service built on Ceph's distributed object store, with metadata served by Metadata Servers.

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## v19.2.4 Squid released

DevFeed: [v19.2.4 Squid released](<https://devfeed.tech/articles/v19-2-4-squid-released-12340.md>)

Original publisher: [Read original article](<https://ceph.io/en/news/blog/2026/v19-2-4-squid-released/>)

Author: Yuri Weinstein

Published: 2026-06-01T00:00:00Z

Content type: release

Language: en

Sources: [Ceph Blog](<https://devfeed.tech/sources/ceph-blog.md>)

Topics: [cephfs](<https://devfeed.tech/topics/cephfs.md>), [Kafka](<https://devfeed.tech/topics/kafka.md>), [dashboards](<https://devfeed.tech/topics/dashboards.md>), [Authorization](<https://devfeed.tech/topics/authorization.md>), [Tooling](<https://devfeed.tech/topics/tooling.md>)

Tags: [blog-post](<https://devfeed.tech/tags/blog-post.md>), [bug](<https://devfeed.tech/tags/bug.md>), [cephfs](<https://devfeed.tech/tags/cephfs.md>), [en-article](<https://devfeed.tech/tags/en-article.md>), [en-blog-post](<https://devfeed.tech/tags/en-blog-post.md>), [json](<https://devfeed.tech/tags/json.md>), [kafka](<https://devfeed.tech/tags/kafka.md>), [release](<https://devfeed.tech/tags/release.md>), [squid](<https://devfeed.tech/tags/squid.md>), [update](<https://devfeed.tech/tags/update.md>)

### AI overview

Ceph v19.2.4 Squid is the fourth backport release in the Squid series, and the article recommends that all users update. Changes include BlueFS storage adjustments, fixes in RADOS and RADOS Gateway, Kafka 3.9.2 support, CephFS and MDS diagnostic and consistency improvements, Dashboard service and access-control fixes, and an RBD lock policy change.

### Source excerpt

This is the fourth backport release in the Squid series. We recommend all users update to this release. Notable Changes ¶ OSD / BlueStore ¶ BlueFS: Increased the default WAL volume size to 1GB to prevent ENOSPC failures. Volume Selection: Fixed the usage of bluestore_volume_selection_reserved_factor and updated row naming conventions in RocksDBBlueFSVolumeSelector. Health: Added a time_added field to mon_info_t to prevent freshly added monitors from incorrectly triggering a MON_DOWN health status. Tooling: Updated monmaptool to correctly respect set features when adding addresses. RADOS / Manager (mgr) ¶ RADOS pybind: Fixed a parameter reversal bug in WriteOp.zero() where offset and length were swapped when calling the underlying C API. Daemon Health: Modified the manager to clear health metrics for down or out OSDs instead of removing them entirely from the daemon state. Autoscaler: Updated pg_autoscale_mode logic to accurately reflect the no_autoscale flag in both standard and JSON command outputs. RADOS Gateway (RGW) ¶ Notifications: Resolved a reserved_size drift in the 2pc_queue causing ENOSPC errors and fixed a leak where overhead was not properly decremented during commit/abort. Multipart Uploads: Fixed an issue where tags could not be retrieved from objects created via multipart uploads. Kafka Integration: Updated the internal Kafka version support to 3.9.2. CephFS / MDS ¶ Fragments: Simplified fragment printing and corrected frag_t endianness conversion for network and storage consistency. FUSE Client: Updated the FUSE client to clarify that fallocate disk space reservation is only supported with specific flags like FALLOC_FL_KEEP_SIZE. Metadata: Updated the MDS to dump frag_t as an object and included sysinfo in the status command output for better diagnostics. Dashboard ¶ Services: Fixed a bug where changing MDS placement to a label incorrectly triggered the creation of an entirely new MDS service. Access Control: Fixed role-based access control permissio