Dears, We have a ceph cluster with 4096 PGs out of with +100 PGs are not active+clean. On top of the ceph cluster, we have a ceph FS, with 3 active MDS servers. It seems that we can’t get all the files out of it because of the affected PGs. The object store has more than 400 million objects. When we do “rados -p cephfs-data ls”, the listing stops (hangs) after listing +11 million objects. When we try to access an object which we can’t copy, the rados command hangs forever: ls -I <filename> 2199140525188 printf "%x\n" 2199140525188 20006fd6484 rados -p cephfs-data stat 20006fd6484.00000000 (hangs here) This is the current status of the ceph cluster: health: HEALTH_WARN 1 MDSs report slow metadata IOs 1 MDSs report slow requests 1 MDSs behind on trimming 1 osds exist in the crush map but not in the osdmap *Reduced data availability: 22 pgs inactive, 22 pgs incomplete* 240324 slow ops, oldest one blocked for 391503 sec, daemons [osd.144,osd.159,osd.180,osd.184,osd.242,osd.271,osd.275,osd.278,osd.280,osd.332]... h ave slow ops. mons xyz01,xyz02 are low on available space services: mon: 4 daemons, quorum abc001,abc002,xyz02,xyz01 mgr: abc002(active), standbys: xyz01, xyz02, abc001 mds: cephfs-3/3/3 up {0=xyz02=up:active,1=abc001=up:active,2=abc002=up:active}, 1 up:standby osd: 421 osds: 421 up, 421 in; 7 remapped pgs data: pools: 2 pools, 4096 pgs objects: 403.4 M objects, 846 TiB usage: 1.2 PiB used, 1.4 PiB / 2.6 PiB avail pgs: 0.537% pgs not active 3968 active+clean 96 active+clean+scrubbing+deep+repair 15 incomplete 10 active+clean+scrubbing 7 remapped+incomplete io: client: 89 KiB/s rd, 13 KiB/s wr, 34 op/s rd, 1 op/s wr The 100+ PGs have been in this state for a long time already. Sometimes when we try to copy some files the rsync process hangs and we can’t kill it and from the process stack, it seems to be hanging on ceph i/o operation. # cat /proc/51795/stack [<ffffffffc184206d>] ceph_mdsc_do_request+0xfd/0x280 [ceph] [<ffffffffc181e92e>] __ceph_do_getattr+0x9e/0x200 [ceph] [<ffffffffc181eb08>] ceph_getattr+0x28/0x100 [ceph] [<ffffffffab853689>] vfs_getattr+0x49/0x80 [<ffffffffab8537b5>] vfs_fstatat+0x75/0xc0 [<ffffffffab853bc1>] SYSC_newlstat+0x31/0x60 [<ffffffffab85402e>] SyS_newlstat+0xe/0x10 [<ffffffffabd93f92>] system_call_fastpath+0x25/0x2a [<ffffffffffffffff>] 0xffffffffffffffff # cat /proc/51795/mem cat: /proc/51795/mem: Input/output error Any idea on how to move forward with debugging and fixing this issue so we can get the data out of the ceph FS? Thank you in advance. Kind regards, adel This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, Atos’ liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted. On all offers and agreements under which Atos Nederland B.V. supplies goods and/or services of whatever nature, the Terms of Delivery from Atos Nederland B.V. exclusively apply. The Terms of Delivery shall be promptly submitted to you on your request.