We're happy to announce the 7th backport release in the Quincy series. https://ceph.io/en/news/blog/2023/v17-2-7-quincy-released/ Notable Changes --------------- * `ceph mgr dump` command now displays the name of the Manager module that registered a RADOS client in the `name` field added to elements of the `active_clients` array. Previously, only the address of a module's RADOS client was shown in the `active_clients` array. * mClock Scheduler: The mClock scheduler (default scheduler in Quincy) has undergone significant usability and design improvements to address the slow backfill issue. Some important changes are: * The 'balanced' profile is set as the default mClock profile because it represents a compromise between prioritizing client IO or recovery IO. Users can then choose either the 'high_client_ops' profile to prioritize client IO or the 'high_recovery_ops' profile to prioritize recovery IO. * QoS parameters including reservation and limit are now specified in terms of a fraction (range: 0.0 to 1.0) of the OSD's IOPS capacity. * The cost parameters (osd_mclock_cost_per_io_usec_* and osd_mclock_cost_per_byte_usec_*) have been removed. The cost of an operation is now determined using the random IOPS and maximum sequential bandwidth capability of the OSD's underlying device. * Degraded object recovery is given higher priority when compared to misplaced object recovery because degraded objects present a data safety issue not present with objects that are merely misplaced. Therefore, backfilling operations with the 'balanced' and 'high_client_ops' mClock profiles may progress slower than what was seen with the 'WeightedPriorityQueue' (WPQ) scheduler. * The QoS allocations in all mClock profiles are optimized based on the above fixes and enhancements. * For more detailed information see: https://docs.ceph.com/en/quincy/rados/configuration/mclock-config-ref/ * RGW: S3 multipart uploads using Server-Side Encryption now replicate correctly in multi-site. Previously, the replicas of such objects were corrupted on decryption. A new tool, ``radosgw-admin bucket resync encrypted multipart``, can be used to identify these original multipart uploads. The ``LastModified`` timestamp of any identified object is incremented by 1 nanosecond to cause peer zones to replicate it again. For multi-site deployments that make any use of Server-Side Encryption, we recommended running this command against every bucket in every zone after all zones have upgraded. * CephFS: MDS evicts clients which are not advancing their request tids which causes a large buildup of session metadata resulting in the MDS going read-only due to the RADOS operation exceeding the size threshold. `mds_session_metadata_threshold` config controls the maximum size that a (encoded) session metadata can grow. * CephFS: After recovering a Ceph File System post following the disaster recovery procedure, the recovered files under `lost+found` directory can now be deleted. Getting Ceph ------------ * Git at git://github.com/ceph/ceph.git * Tarball at https://download.ceph.com/tarballs/ceph-17.2.7.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: b12291d110049b2f35e32e0de30d70e9a4c060d2