September 2020 - ceph-users

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3 years, 7 months

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3 years, 7 months

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by emmashiralee＠gmail.com

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3 years, 7 months

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Ceph RGW Performance

by Dylan Griff

Hey folks! Just shooting this out there in case someone has some advice. We're just setting up RGW object storage for one of our new Ceph clusters (3 mons, 1072 OSDs, 34 nodes) and doing some benchmarking before letting users on it. We have 10Gb network to our two RGW nodes behind a single ip on haproxy, and some iperf testing shows I can push that much; latencies look okay. However, when using a small cosbench cluster I am unable to get more than ~250Mb of read speed total. If I add more nodes to the cosbench cluster it just spreads out the load evenly with the same cap Same results when running two cosbench clusters from different locations. I don't see any obvious bottlenecks in terms of the RGW server hardware limitations, but here I am asking for assistance so I don't put it past me missing something. I have attached one of my cosbench load files with keys removed, but I get similar results with different numbers of workers, objects, buckets, object sizes, and cosbench drivers. Does anyone have any pointers on what I could find to nail this bottleneck down? Am I wrong in expecting more throughput? Let me know if I can get any other info for you. Cheers, Dylan -- Dylan Griff Senior System Administrator CLE D063 RCS - Systems - University of Victoria

3 years, 7 months

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Doing minor version update of Ceph cluster with ceph-ansible and rolling-update playbook

by andreas.elvers+lists.ceph.io＠lfda.de

I want to update my mimic cluster to the latest minor version using the rolling-update script of ceph-ansible. The cluster was rolled out with that setup. So as long as ceph_stable_release stays on the current installed version (mimic) the rolling update script will do only a minor update. Is this assumption correct? The documentation (https://docs.ceph.com/projects/ceph-ansible/en/latest/day-2/upgrade.html) is short on this. Thanks! - Andreas

3 years, 7 months

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How OSD encryption affects latency/iops on NVMe, SSD and HDD

by tri＠postix.net

Hi all, For those who use encryption on your OSDs, what effect do you see on your NVMe, SSD and HDD vs non-encrypted OSDs? I tried to find some info on this subject but there isn't much detail available. From experience, dmcrypt is CPU-bound and becomes a bottleneck when used on very fast NVMe. Using aes-xts, one can only expect around 1600-2000GB/s with 256/512 bit keys. Best, Tri Hoang

3 years, 7 months

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Octopus OSDs dropping out of cluster: _check_auth_rotating possible clock skew, rotating keys expired way too early

by Wido den Hollander

Hi, On a recently deployed Octopus (15.2.2) cluster (240 OSDs) we are seeing OSDs randomly drop out of the cluster. Usually it's 2 to 4 OSDs spread out over different nodes. Each node has 16 OSDs and not all the failing OSDs are on the same node. The OSDs are marked as down and all they keep print in their logs: monclient: _check_auth_rotating possible clock skew, rotating keys expired way too early (before 2020-06-04T07:57:17.706529-0400) Looking at their status through the admin socket: { "cluster_fsid": "68653193-9b84-478d-bc39-1a811dd50836", "osd_fsid": "87231b5d-ae5f-4901-93c5-18034381e5ec", "whoami": 206, "state": "active", "oldest_map": 73697, "newest_map": 75795, "num_pgs": 19 } The message brought me to my own ticket I created 2 years ago: https://tracker.ceph.com/issues/23460 The first thing I've checked is NTP/time. Double, triple check this. All the times are in sync on the cluster. Nothing wrong there. Again, it's not all the OSDs on a node failing. Just 1 or 2 dropping out. Restarting them brings them back right away and then within 24h some other OSDs will drop out. Has anybody seen this behavior with Octopus as well? Wido

3 years, 7 months

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3 years, 7 months

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3 years, 7 months

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[orch] redeploying OSDs

by mnaser＠vexxhost.com

Hi folks: I've been playing around with the new Ceph orchestrator and I've been running into an interesting limitation. I have not found any documented process or combination of things to do which can allow me to 're-adopt' cephadm deployed OSDs. Think use case of reinstalling operating systems, in the old world, we'd just run: `ceph-volume lvm activate` --all and we'll be good to go. Is there any equivalent right now? Thanks Mohammed

3 years, 7 months

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ceph-users September 2020