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
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