ceph-users April 2023

ceph-users@ceph.io

152 participants
156 discussions

by Nicola Mori

Dear Ceph users, my cluster is made up of 10 old machines, with uneven number of disks and disk size. Essentially I have just one big data pool (6+2 erasure code, with host failure domain) for which I am currently experiencing a very poor available space (88 TB of which 40 TB occupied, as reported by df -h on hosts mounting the cephfs) compared to the raw one (196.5 TB). I have a total of 104 OSDs and 512 PGs for the pool; I cannot increment the PG number since the machines are old and with very low amount of RAM, and some of them are already overloaded. In this situation I'm seeing a high occupation of small OSDs (500 MB) with respect to bigger ones (2 and 4 TB) even if the weight is set equal to disk capacity (see below for ceph osd tree). For example OSD 9 is at 62% occupancy even with weight 0.5 and reweight 0.75, while the highest occupancy for 2 TB OSDs is 41% (OSD 18) and 4 TB OSDs is 23% (OSD 79). I guess this high occupancy for 500 MB OSDs combined with erasure code size and host failure domain might be the cause of the poor available space, could this be true? The upmap balancer is currently running but I don't know if and how much it could improve the situation. Any hint is greatly appreciated, thanks. Nicola # ceph osd tree ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF -1 196.47754 root default -7 14.55518 host aka 4 hdd 1.81940 osd.4 up 1.00000 1.00000 11 hdd 1.81940 osd.11 up 1.00000 1.00000 18 hdd 1.81940 osd.18 up 1.00000 1.00000 26 hdd 1.81940 osd.26 up 1.00000 1.00000 32 hdd 1.81940 osd.32 up 1.00000 1.00000 41 hdd 1.81940 osd.41 up 1.00000 1.00000 48 hdd 1.81940 osd.48 up 1.00000 1.00000 55 hdd 1.81940 osd.55 up 1.00000 1.00000 -3 14.55518 host balin 0 hdd 1.81940 osd.0 up 1.00000 1.00000 8 hdd 1.81940 osd.8 up 1.00000 1.00000 15 hdd 1.81940 osd.15 up 1.00000 1.00000 22 hdd 1.81940 osd.22 up 1.00000 1.00000 29 hdd 1.81940 osd.29 up 1.00000 1.00000 34 hdd 1.81940 osd.34 up 1.00000 1.00000 43 hdd 1.81940 osd.43 up 1.00000 1.00000 49 hdd 1.81940 osd.49 up 1.00000 1.00000 -13 29.10950 host bifur 3 hdd 3.63869 osd.3 up 1.00000 1.00000 14 hdd 3.63869 osd.14 up 1.00000 1.00000 27 hdd 3.63869 osd.27 up 1.00000 1.00000 37 hdd 3.63869 osd.37 up 1.00000 1.00000 50 hdd 3.63869 osd.50 up 1.00000 1.00000 59 hdd 3.63869 osd.59 up 1.00000 1.00000 64 hdd 3.63869 osd.64 up 1.00000 1.00000 69 hdd 3.63869 osd.69 up 1.00000 1.00000 -17 29.10950 host bofur 2 hdd 3.63869 osd.2 up 1.00000 1.00000 21 hdd 3.63869 osd.21 up 1.00000 1.00000 39 hdd 3.63869 osd.39 up 1.00000 1.00000 57 hdd 3.63869 osd.57 up 1.00000 1.00000 66 hdd 3.63869 osd.66 up 1.00000 1.00000 72 hdd 3.63869 osd.72 up 1.00000 1.00000 76 hdd 3.63869 osd.76 up 1.00000 1.00000 79 hdd 3.63869 osd.79 up 1.00000 1.00000 -21 29.10376 host dwalin 88 hdd 1.81898 osd.88 up 1.00000 1.00000 89 hdd 1.81898 osd.89 up 1.00000 1.00000 90 hdd 1.81898 osd.90 up 1.00000 1.00000 91 hdd 1.81898 osd.91 up 1.00000 1.00000 92 hdd 1.81898 osd.92 up 1.00000 1.00000 93 hdd 1.81898 osd.93 up 1.00000 1.00000 94 hdd 1.81898 osd.94 up 1.00000 1.00000 95 hdd 1.81898 osd.95 up 1.00000 1.00000 96 hdd 1.81898 osd.96 up 1.00000 1.00000 97 hdd 1.81898 osd.97 up 1.00000 1.00000 98 hdd 1.81898 osd.98 up 1.00000 1.00000 99 hdd 1.81898 osd.99 up 1.00000 1.00000 100 hdd 1.81898 osd.100 up 1.00000 1.00000 101 hdd 1.81898 osd.101 up 1.00000 1.00000 102 hdd 1.81898 osd.102 up 1.00000 1.00000 103 hdd 1.81898 osd.103 up 1.00000 1.00000 -9 14.55518 host ogion 7 hdd 1.81940 osd.7 up 1.00000 1.00000 16 hdd 1.81940 osd.16 up 1.00000 1.00000 23 hdd 1.81940 osd.23 up 1.00000 1.00000 33 hdd 1.81940 osd.33 up 1.00000 1.00000 40 hdd 1.81940 osd.40 up 1.00000 1.00000 47 hdd 1.81940 osd.47 up 1.00000 1.00000 54 hdd 1.81940 osd.54 up 1.00000 1.00000 61 hdd 1.81940 osd.61 up 1.00000 1.00000 -19 14.55518 host prestno 81 hdd 1.81940 osd.81 up 1.00000 1.00000 82 hdd 1.81940 osd.82 up 1.00000 1.00000 83 hdd 1.81940 osd.83 up 1.00000 1.00000 84 hdd 1.81940 osd.84 up 1.00000 1.00000 85 hdd 1.81940 osd.85 up 1.00000 1.00000 86 hdd 1.81940 osd.86 up 1.00000 1.00000 87 hdd 1.81940 osd.87 up 1.00000 1.00000 104 hdd 1.81940 osd.104 up 1.00000 1.00000 -15 29.10376 host remolo 6 hdd 1.81897 osd.6 up 1.00000 1.00000 12 hdd 1.81897 osd.12 up 1.00000 1.00000 19 hdd 1.81897 osd.19 up 1.00000 1.00000 28 hdd 1.81897 osd.28 up 1.00000 1.00000 35 hdd 1.81897 osd.35 up 1.00000 1.00000 44 hdd 1.81897 osd.44 up 1.00000 1.00000 52 hdd 1.81897 osd.52 up 1.00000 1.00000 58 hdd 1.81897 osd.58 up 1.00000 1.00000 63 hdd 1.81897 osd.63 up 1.00000 1.00000 67 hdd 1.81897 osd.67 up 1.00000 1.00000 71 hdd 1.81897 osd.71 up 1.00000 1.00000 73 hdd 1.81897 osd.73 up 1.00000 1.00000 74 hdd 1.81897 osd.74 up 1.00000 1.00000 75 hdd 1.81897 osd.75 up 1.00000 1.00000 77 hdd 1.81897 osd.77 up 1.00000 1.00000 78 hdd 1.81897 osd.78 up 1.00000 1.00000 -5 14.55518 host rokanan 1 hdd 1.81940 osd.1 up 1.00000 1.00000 10 hdd 1.81940 osd.10 up 1.00000 1.00000 17 hdd 1.81940 osd.17 up 1.00000 1.00000 24 hdd 1.81940 osd.24 up 1.00000 1.00000 31 hdd 1.81940 osd.31 up 1.00000 1.00000 38 hdd 1.81940 osd.38 up 1.00000 1.00000 46 hdd 1.81940 osd.46 up 1.00000 1.00000 53 hdd 1.81940 osd.53 up 1.00000 1.00000 -11 7.27515 host romolo 5 hdd 0.45470 osd.5 up 1.00000 1.00000 9 hdd 0.45470 osd.9 up 0.75000 1.00000 13 hdd 0.45470 osd.13 up 1.00000 1.00000 20 hdd 0.45470 osd.20 up 0.95000 1.00000 25 hdd 0.45470 osd.25 up 0.75000 1.00000 30 hdd 0.45470 osd.30 up 1.00000 1.00000 36 hdd 0.45470 osd.36 up 1.00000 1.00000 42 hdd 0.45470 osd.42 up 1.00000 1.00000 45 hdd 0.45470 osd.45 up 0.85004 1.00000 51 hdd 0.45470 osd.51 up 0.89999 1.00000 56 hdd 0.45470 osd.56 up 1.00000 1.00000 60 hdd 0.45470 osd.60 up 1.00000 1.00000 62 hdd 0.45470 osd.62 up 1.00000 1.00000 65 hdd 0.45470 osd.65 up 0.85004 1.00000 68 hdd 0.45470 osd.68 up 1.00000 1.00000 70 hdd 0.45470 osd.70 up 1.00000 1.00000

1 year, 1 month

Re: monitoring apply_latency / commit_latency ?

by Konstantin Shalygin

Hi, > On 2 Apr 2023, at 23:14, Matthias Ferdinand <mf+ml.ceph(a)mfedv.net> wrote: > > I understand that grafana graphs are generated from prometheus metrics. > I just wanted to know which OSD daemon-perf values feed these prometheus > metrics (or if they are generated in some other way). Yep, this perf metrics is generated in some way 🙂 You can consult with ceph-mgr prometheus module source code [1] [1] https://github.com/ceph/ceph/blob/main/src/pybind/mgr/prometheus/module.py#… k

1 year, 1 month

Set the Quality of Service configuration.

by farhad kh

how to i can set IO quota or limit for R/W for erasure coding pool in ceph ?

1 year, 1 month

monitoring apply_latency / commit_latency ?

by Matthias Ferdinand

Hi, I would like to understand how the per-OSD data from "ceph osd perf" (i.e. apply_latency, commit_latency) is generated. So far I couldn't find documentation on this. "ceph osd perf" output is nice for a quick glimpse, but is not very well suited for graphing. Output values are from the most recent 5s-averages apparently. With "ceph daemon osd.X perf dump" OTOH, you get quite a lot of latency metrics, while it is just not obvious to me how they aggregate into apply_latency and commit_latency. Or some comparably easy read latency metric (something that is missing completely in "ceph osd perf"). Can somebody shed some light on this? Regards Matthias

1 year, 1 month

avg apply latency went up after update from octopus to pacific

by Boris Behrens

Hi, today I did the first update from octopus to pacific, and it looks like the avg apply latency went up from 1ms to 2ms. All 36 OSDs are 4TB SSDs and nothing else changed. Someone knows if this is an issue, or am I just missing a config value? Cheers Boris

1 year, 1 month

Failing to create monitor in a working cluster.

by pmestre＠gmail.com

Hello, i've been running a 3 node proxmox cluster with 4 ceph osd for 3 years as a production cluster. As a test for trying to move ceph cluster network, i destroyed one of the 3 working monitors and tried to recreate it. After destroying it, the new monitor refuses to join the cluster, even in the old network. I've tried all steps in documentation "Troubleshooting monitors" section. New monitor has this config extracted from ceph --admin-daemon file.asok { "name": "n3ceph", "rank": -1, "state": "probing", "election_epoch": 0, "quorum": [], "features": { "required_con": "2449958197560098820", "required_mon": [ "kraken", "luminous", "mimic", "osdmap-prune", "nautilus", "octopus", "pacific", "elector-pinging" ], "quorum_con": "0", "quorum_mon": [] }, "outside_quorum": [], "extra_probe_peers": [], "sync_provider": [], "monmap": { "epoch": 6, "fsid": "5e60d0bb-33b4-42db-bbe7-7032c35ee605", "modified": "2023-03-31T11:54:44.616569Z", "created": "2019-12-02T13:50:38.097448Z", "min_mon_release": 16, "min_mon_release_name": "pacific", "election_strategy": 1, "disallowed_leaders: ": "", "stretch_mode": false, "tiebreaker_mon": "", "removed_ranks: ": "1", "features": { "persistent": [ "kraken", "luminous", "mimic", "osdmap-prune", "nautilus", "octopus", "pacific", "elector-pinging" ], "optional": [] }, "mons": [ { "rank": 0, "name": "node1", "public_addrs": { "addrvec": [ { "type": "v2", "addr": "10.100.100.1:3300", "nonce": 0 }, { "type": "v1", "addr": "10.100.100.1:6789", "nonce": 0 } ] }, "addr": "10.100.100.1:6789/0", "public_addr": "10.100.100.1:6789/0", "priority": 0, "weight": 0, "crush_location": "{}" }, { "rank": 1, "name": "node2", "public_addrs": { "addrvec": [ { "type": "v2", "addr": "10.100.100.2:3300", "nonce": 0 }, { "type": "v1", "addr": "10.100.100.2:6789", "nonce": 0 } ] }, "addr": "10.100.100.2:6789/0", "public_addr": "10.100.100.2:6789/0", "priority": 0, "weight": 0, "crush_location": "{}" } ] }, "feature_map": { "mon": [ { "features": "0x3f01cfbdfffdffff", "release": "luminous", "num": 1 } ] }, "stretch_mode": false } The quorum mon stat is as follows: { "name": "node1", "rank": 0, "state": "leader", "election_epoch": 340, "quorum": [ 0, 1 ], "quorum_age": 13090, "features": { "required_con": "2449958747317026820", "required_mon": [ "kraken", "luminous", "mimic", "osdmap-prune", "nautilus", "octopus", "pacific", "elector-pinging" ], "quorum_con": "4540138314316775423", "quorum_mon": [ "kraken", "luminous", "mimic", "osdmap-prune", "nautilus", "octopus", "pacific", "elector-pinging" ] }, "outside_quorum": [], "extra_probe_peers": [], "sync_provider": [], "monmap": { "epoch": 6, "fsid": "5e60d0bb-33b4-42db-bbe7-7032c35ee605", "modified": "2023-03-31T11:54:44.616569Z", "created": "2019-12-02T13:50:38.097448Z", "min_mon_release": 16, "min_mon_release_name": "pacific", "election_strategy": 1, "disallowed_leaders: ": "", "stretch_mode": false, "tiebreaker_mon": "", "removed_ranks: ": "1", "features": { "persistent": [ "kraken", "luminous", "mimic", "osdmap-prune", "nautilus", "octopus", "pacific", "elector-pinging" ], "optional": [] }, "mons": [ { "rank": 0, "name": "node1", "public_addrs": { "addrvec": [ { "type": "v2", "addr": "10.100.100.1:3300", "nonce": 0 }, { "type": "v1", "addr": "10.100.100.1:6789", "nonce": 0 } ] }, "addr": "10.100.100.1:6789/0", "public_addr": "10.100.100.1:6789/0", "priority": 0, "weight": 0, "crush_location": "{}" }, { "rank": 1, "name": "node2", "public_addrs": { "addrvec": [ { "type": "v2", "addr": "10.100.100.2:3300", "nonce": 0 }, { "type": "v1", "addr": "10.100.100.2:6789", "nonce": 0 } ] }, "addr": "10.100.100.2:6789/0", "public_addr": "10.100.100.2:6789/0", "priority": 0, "weight": 0, "crush_location": "{}" } ] }, "feature_map": { "mon": [ { "features": "0x3f01cfbdfffdffff", "release": "luminous", "num": 1 } ], "osd": [ { "features": "0x3f01cfbdfffdffff", "release": "luminous", "num": 5 } ], "client": [ { "features": "0x2f018fb87aa4aafe", "release": "luminous", "num": 1 }, { "features": "0x3f01cfbdfffdffff", "release": "luminous", "num": 12 } ], "mgr": [ { "features": "0x3f01cfbdfffdffff", "release": "luminous", "num": 1 } ] }, "stretch_mode": false I tried to get a debug log with ceph daemon mon.n3ceph config set debug_mon 10/10 and restarting the service, but the ceph log file stoped working after i tried that setting. journalctl -u tells me: mar 31 17:35:22 node3 ceph-mon[240916]: 2023-03-31T17:35:22.926+0200 7f49e0699700 -1 mon.n3ceph@-1(probing) e6 get_health_metrics reporting 4 slow ops, oldest is log(1 entries from seq 1 at 2023-03-31T17:30:19.347379+0200) mar 31 17:35:27 node3 ceph-mon[240916]: 2023-03-31T17:35:27.926+0200 7f49e0699700 -1 mon.n3ceph@-1(probing) e6 get_health_metrics reporting 4 slow ops, oldest is log(1 entries from seq 1 at 2023-03-31T17:30:19.347379+0200) mar 31 17:35:32 node3 ceph-mon[240916]: 2023-03-31T17:35:32.926+0200 7f49e0699700 -1 mon.n3ceph@-1(probing) e6 get_health_metrics reporting 4 slow ops, oldest is log(1 entries from seq 1 at 2023-03-31T17:30:19.347379+0200). Any ideas? Cluster is running fine with two monitors, but a reboot in one of the nodes might be a big problem. Kind regards and many thanks.

1 year, 1 month

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ceph-users April 2023