Hi Reto, hi Bill I found this PR that was merged after v20.2.0 was tagged. https://github.com/ceph/ceph/pull/66021 I'm running Tentacle on Ubuntu Jammy without cephadm, with EC 6+2 and FastEC enabled. I'm getting inconsistent PGs with errors like these: 3.336s0 shard 25(5) soid 3:6cc82c0a:::10002107475.0000002c:head : size 700416 != size 696320 from auth oi 3:6cc82c0a:::10002107475.0000002c:head(2830345'2540087 osd.41.2825431:3886213 dirty|data_digest s 4194304 uv 17841689 dd 8f22c13e alloc_hint [0 0 0]) 3.336s0 shard 13(4) soid 3:6cc1c47e:::10002585665.0000045e:10279 : size 700416 != size 696320 from auth oi 3:6cc1c47e:::10002585665.0000045e:10279(2905787'3123318 osd.41.2896446:3729885 dirty|data_digest s 4194304 uv 23445132 dd 365ee4af alloc_hint [0 0 0] shard_versions={1: 2904402'3115959, 2: 2904402'3115959, 3: 2904402'3115959, 4: 2904402'3115959, 5: 2904402'3115959}) 3.336s0 shard 13(4) soid 3:6cc1f637:::20000007ea9.000008fb:bd : size 700416 != size 696320 from auth oi 3:6cc1f637:::20000007ea9.000008fb:bd(45314'680679 client.124476.0:17244371 dirty|data_digest s 4194304 uv 274244 dd 9f754009 alloc_hint [0 0 0]) 3.336 shard 13(4) soid 3:6cc82c71:::1000098dda0.00000237:head : candidate size 700416 info size 696320 mismatch 3.336 shard 60(1) soid 3:6cde2c17:::20001b3c880.00000000:head : candidate size 4096 info size 0 mismatch 3.336 shard 13(4) soid 3:6cde2eb0:::100000d68b9.0000000b:head : candidate size 622592 info size 618496 mismatch All these errors have something to do with size. When I restart the OSDs the cluster is healthy until some scrub picks this up again. The data seems ok. It seems like the fix is not in the tentacle release. Is there a future release with fixes for this planned? Regards Eric On Fri, 5 Dec 2025 at 16:34, Reto Gysi via ceph-users <ceph-users@ceph.io> wrote:

Hi Bill

Am Fr., 5. Dez. 2025 um 10:02 Uhr schrieb Bill Scales < bill_scales@uk.ibm.com>:

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Hi Reto,

Sorry to hear about your problems with turning on ec optimizations. I've led the team that developed this feature, so we are keen to help understand what happened to your system.

Your configuration looks fine as far as being supported with ec optimizations. The daemons (mons, osds and mgr) need to be running tentacle code to use this feature, there is no requirement to update any of your clients.

Do you have any more examples of the inconsistent objects logs that you can share with me?

There was a bug that we fixed late in the development cycle which was scrubbing incorrectly reporting a size mismatch for objects written prior to turning on optimizations. This is because prior to turning on optimizations objects are padded to a multiple of the stripe_width, afterwards objects are no longer padded. The scrub code was occasionally getting confused and incorrectly reporting an inconsistency. In this case the scrub was reporting false positive errors - there was nothing wrong with the data and no problems accessing the data. I notice the log you shared in the email was for a size mismatch, I'm interested whether all the logs were for mismatched sizes. We will do some further work to confirm that the fix is in the 20.2.0 tentacle release and that there are no problems with the back port.

As far I could see the errors where all about the mismatched sizes.

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You also mention that you saw some OSD crashes. Do you have any further information about these?

I just could cause another crash with starting up a windows VM, and doing a WIndows file history backup to a drive that is on an RBD Image on pool rbd_ecpool where I had the allow_ec_optimization flag enabled.

<disk type="network" device="disk"> <driver name="qemu" type="raw" cache="writethrough" io="threads" discard="unmap" detect_zeroes="unmap"/> <auth username="admin"> <secret type="ceph" uuid="878b0bc5-c471-4ec6-a92a-f65282ffbdf6"/> </auth> <source protocol="rbd" name="rbd/game_windows_backup_drive" index="3"> <host name="zephir" port="6789"/> </source> <target dev="vdd" bus="virtio"/> <alias name="virtio-disk3"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/> </disk>

root@zephir:~# ceph -s cluster: id: 27923302-87a5-11ec-ac5b-976d21a49941 health: HEALTH_WARN 2 osds down Reduced data availability: 49 pgs inactive Degraded data redundancy: 15722192/79848340 objects degraded (19.690%), 246 pgs degraded, 247 pgs undersized

services: mon: 3 daemons, quorum zephir,debian,raspi (age 20h) [leader: zephir] mgr: zephir.enywvy(active, since 21h), standbys: debian.nusuye mds: 3/3 daemons up, 3 standby osd: 18 osds: 16 up (since 5m), 18 in (since 3d); 8 remapped pgs cephfs-mirror: 2 daemons active (2 hosts) rbd-mirror: 2 daemons active (2 hosts) rgw: 1 daemon active (1 hosts, 1 zones) tcmu-runner: 5 portals active (2 hosts)

data: volumes: 3/3 healthy pools: 25 pools, 450 pgs objects: 17.52M objects, 62 TiB usage: 116 TiB used, 63 TiB / 179 TiB avail pgs: 10.889% pgs not active 15722192/79848340 objects degraded (19.690%) 197 active+undersized+degraded 183 active+clean 49 undersized+degraded+peered 15 active+clean+scrubbing 5 active+clean+scrubbing+deep 1 active+undersized

io: client: 1.7 KiB/s rd, 1023 B/s wr, 1 op/s rd, 0 op/s wr

root@zephir:~# ceph osd status ID HOST USED AVAIL WR OPS WR DATA RD OPS RD DATA STATE 0 debian 11.2T 5289G 0 0 0 0 exists,up 1 zephir 11.6T 4846G 0 0 0 0 exists 2 zephir 10.7T 5827G 0 0 2 4 exists,up 3 zephir 11.0T 5497G 0 0 0 0 exists 4 zephir 159G 1376G 0 0 2 0 exists,up 5 zephir 120G 1415G 0 0 0 0 exists,up 6 debian 11.3T 5200G 0 0 1 0 exists,up 7 zephir 305G 1230G 0 0 0 0 exists,up 8 zephir 10.9T 5594G 0 0 0 0 exists,up 9 zephir 11.9T 4616G 0 0 0 0 exists,up 10 zephir 235G 1300G 0 0 0 0 exists,up 11 zephir 223G 1312G 0 0 0 0 exists,up 12 zephir 11.0T 5479G 0 0 0 0 exists,up 13 debian 118G 631G 0 0 3 8 exists,up 14 debian 345G 1190G 0 0 0 0 exists,up 15 debian 11.4T 5079G 0 0 0 0 exists,up 16 debian 554G 3029G 0 0 3 8 exists,up 17 debian 12.5T 5874G 0 0 1 0 exists,up root@zephir:~#

I attached the log of osd.1 to https://filebin.net/jwvs6kuqrc7hx8id

Best Regards,

Reto

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