Hi Reed, Thank you for getting back to us.
We had indeed several disk failures at the same time. Regarding the OSD map, we have an OSD that failed and we needed to remove but we didn't update the crushmap. The question here, is it safe to update the OSD crushmap without affecting the data available? We can free up more space on the monitors if that will help indeed. More information which can be helpful: # ceph -v ceph version 13.2.10 (564bdc4ae87418a232fc901524470e1a0f76d641) mimic (stable) # ceph health detail https://pastebin.pl/view/2b8b337d # ceph osd pool ls detail pool 3 'cephfs-data' erasure size 12 min_size 11 crush_rule 1 object_hash rjenkins pg_num 3072 pgp_num 3072 last_change 370219 lfor 0/367599 flags hashpspool,ec_overwrites,selfmanaged_snaps stripe_width 40960 fast_read 1 compression_algorithm snappy compression_mode force application cephfs removed_snaps [2~7c] pool 4 'cephfs-meta' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 1024 pgp_num 1024 last_change 370219 lfor 0/367414 flags hashpspool stripe_width 0 compression_algorithm none compression_mode none application cephfs # ceph osd tree https://pastebin.pl/view/eac56017 Our main struggle is when we try to rsync data, the rsync process hangs because it encounters an inaccessible object. Is there a way we can take out the incomplete PGs to be able to copy data smoothly without having to reset the rsync process? Kind regards, adel -----Original Message----- From: Reed Dier <reed.d...@focusvq.com> Sent: Tuesday, June 15, 2021 4:21 PM To: Aly, Adel <adel....@atos.net> Cc: ceph-users@ceph.io Subject: Re: [ceph-users] ceph PGs issues Caution! External email. Do not open attachments or click links, unless this email comes from a known sender and you know the content is safe. You have incomplete PGs, which means you have inactive data, because the data isn't there. This will typically only happen when you have multiple concurrent disk failures, or something like that, so I think there is some missing info. > 1 osds exist in the crush map but not in the osdmap This seems like a red flag to have an OSD in the crush map but not the osdmap. > mons xyz01,xyz02 are low on available space Your mons are probably filling up data running in the warn state. This can be problematic for recovery. I think you will be more likely to receive some useful suggestions by providing things like which version of ceph you are using ($ ceph -v), major events that caused this, poo ($ ceph osd pool ls detail) and osd ($ ceph osd tree) topology, as well as maybe detailed health output ($ ceph health detail). Given how much data some things may be, like the osd tree, you may want to paste to pastebin and link here. Reed > On Jun 15, 2021, at 2:48 AM, Aly, Adel <adel....@atos.net> wrote: > > 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. 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