February 2021 - ceph-users

Nautilus Cluster Struggling to Come Back Online

by William Law

I guess as a sort of follow up from my previous post. Our Nautilus (14.2.16 on ubuntu 18.04) cluster had some sort of event that caused many of the machines to have memory errors. The aftermath is that initially some OSDs had (and continue to have) this error https://tracker.ceph.com/issues/48827 others won't start for various reasons. The OSDs that *will* start are badly behind the current epoch for the most part. It sounds very similar to this: https://blog.noc.grnet.gr/2016/10/18/surviving-a-ceph-cluster-outage-the-ha… We are having trouble getting things back online. I think the path forward is to: -set noup/nodown/noout/nobackfill/and wait for the OSDs that run to come up; we were making good progress yesterday until some of the OSDs crashed with OOM errors. We are again moving forward but understandably nervous. -export the PGs from questionable OSDs and and then rebuild the OSDs; import the PGs if necessary (very likely). Repeat until we are up. Any suggestions for increasing speed? We are using noup/nobackfill/norebalance/pause but the epoch catchup is taking a very long time. Any tips for keeping the epoch from moving forward or speeding up the OSDs catching up? How can we estimate how long it should take? Thank you for any ideas or assistance anyone can provide. Will

2 years

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ceph version of new daemons deployed with orchestrator

by Kenneth Waegeman

Hi all, I am running a cluster managed by orchestrator/cephadm. I installed new host for OSDS yesterday, the osd daemons were automatically created using drivegroups service specs (https://docs.ceph.com/en/latest/cephadm/drivegroups/#drivegroups <https://docs.ceph.com/en/latest/cephadm/drivegroups/#drivegroups>) and they started with a 15.2.9 image, instead of 15.2.8 which all daemons of the cluster are running. I did not yet run ceph orch upgrade to 15.2.9. Is there a way to lock the version of OSDS/daemons created by orchestrator/cephadm? Thanks! Kenneth

2 years

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Newbie Help With ceph-mgr

by duluxoz

Hi All, My ceph-mgr keeps stopping (for some unknown reason) after about an hour or so (but has run for up to 2-3 hours before stopping). Up till now I've simple restarted it with 'ceph-mgr -i ceph01'. Is this normal behaviour, or if it isn't, what should I be looking for in the logs? I was thinking of writing a quick cron script (with 'ceph-mgr -i ceph01') to run on the hour every hour to restart it, but figured that there had to be a better way - especially if ceph-mgr was crashing instead of being a "feature". Any ideas/advice? Thanks in advance Dulux-Oz -- Peregrine IT Signature *Matthew J BLACK* M.Inf.Tech.(Data Comms) MBA B.Sc. MACS (Snr), CP, IP3P When you want it done /right/ ‒ the first time! Phone: +61 4 0411 0089 Email: matthew(a)peregrineit.net <mailto:matthew@peregrineit.net> Web: www.peregrineit.net <http://www.peregrineit.net> View Matthew J BLACK's profile on LinkedIn <http://au.linkedin.com/in/mjblack> This Email is intended only for the addressee. Its use is limited to that intended by the author at the time and it is not to be distributed without the author’s consent. You must not use or disclose the contents of this Email, or add the sender’s Email address to any database, list or mailing list unless you are expressly authorised to do so. Unless otherwise stated, Peregrine I.T. Pty Ltd accepts no liability for the contents of this Email except where subsequently confirmed in writing. The opinions expressed in this Email are those of the author and do not necessarily represent the views of Peregrine I.T. Pty Ltd. This Email is confidential and may be subject to a claim of legal privilege. If you have received this Email in error, please notify the author and delete this message immediately.

2 years

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Newbie Requesting Help - Please, This Is Driving Me Mad/Crazy!

by matthew＠peregrineit.net

Hi Everyone, Let me apologise upfront: If this isn't the correct List to post to If this has been answered already (& I've missed it in my searching) If this has ended up double posted If I've in any way given (or about to give) offence to anyone I really need some help. I'm trying to get a simple single host Pilot/Test Cluster up and running. I'm using CentOS 8 (fully updated), and Ceph-Octopus (latest version from the Ceph Repo). I have both ceph-mon and ceph-mgr working/running (although ceph-mge keeps stopping/crashing after about 1-3 hours or so - but that's another issue), and my first osd (and only osd at this point) *appears* to be working, but when I issue the command 'systemctl start ceph-osd@0' the ceph-osd daemon won't spin up and thus when I issue 'ceph -s' the result says the 'osd: 1 osds: 0 up, 0 in'. I've gone through the relevant logs but I can't seem to find the issue. I'm doing this as a Manual Install because I want to actually *learn* what's going on during the install/etc. I know I can use cephadmin (in a production environment), but as I said, I'm trying to learn how everything "fits together". I've read and re-read the official Ceph Documentation and followed the following steps/commands to get Ceph installed and running: Ran the following commands: su - useradd -d /home/ceph -m ceph -p <password> mkdir /home/ceph/.ssh Added a public SSH Key to /home/ceph/.ssh/authorized_keys. Ran the following commands: chmod 600 /home/ceph/.ssh/* chown ceph:ceph -R /home/ceph/.ssh Added the ceph.repo details to /etc/yum.repos.d/ceph.repo (as per the Ceph Documentation). Ran the following command: dnf -y install qemu-kvm qemu-guest-agent libvirt gdisk ceph Created the /etc/ceph/ceph.conf file (see listing below). Ran the following commands: ceph-authtool --create-keyring /etc/ceph/ceph.mon.keyring --gen-key -n mon. --cap mon 'allow *' ceph-authtool --create-keyring /etc/ceph/ceph.client.admin.keyring --gen-key -n client.admin --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow *' --cap mgr 'allow *' ceph-authtool --create-keyring /var/lib/ceph/bootstrap-osd/keyring --gen-key -n client.bootstrap-osd --cap mon 'profile bootstrap-osd' --cap mgr 'allow r' ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring /etc/ceph/ceph.client.admin.keyring ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring /var/lib/ceph/bootstrap-osd/keyring chown -R ceph:ceph /etc/ceph/ chown -R ceph:ceph /var/lib/ceph/ monmaptool --create --add ceph01 192.168.0.10 --fsid 98e84f97-031f-4958-bd54-22305f6bc738 /etc/ceph/monmap mkdir /var/lib/ceph/mon/ceph-ceph01 chown -R ceph:ceph /var/lib/ceph sudo -u ceph ceph-mon --mkfs -i ceph01 --monmap /etc/ceph/monmap --keyring /etc/ceph/ceph.mon.keyring firewall-cmd --add-service=http --permanent firewall-cmd --add-service=ceph --permanent firewall-cmd --add-service=ceph-mon --permanent firewall-cmd --reload chmod -R 750 /var/lib/ceph/ systemctl start ceph-mon@ceph01 ceph mon enable-msgr2 mkdir /var/lib/ceph/mgr/ceph-ceph01 chown ceph:ceph /var/lib/ceph/mgr/ceph-ceph01 ceph auth get-or-create mgr.ceph01 mon 'allow profile mgr' mds 'allow *' osd 'allow *' -o /var/lib/ceph/mgr/ceph-ceph01/keyring ceph-mgr -i ceph01 Fdisked 3 hdds (sdb, sdc, sdd) as GPT partitions. Ran the following commands: mkfs.xfs /dev/sdb1 mkfs.xfs /dev/sdc1 mkfs.xfs /dev/sdd1 mkdir -p /var/lib/ceph/osd/ceph-{0,1,2} chown -R ceph:ceph /var/lib/ceph/osd mount /dev/sdb1 /var/lib/ceph/osd/ceph-0 mount /dev/sdc1 /var/lib/ceph/osd/ceph-1 mount /dev/sdd1 /var/lib/ceph/osd/ceph-2 So, at this point everything is working, although 'ceph -s' does give a Health Warning about not having the required number of osds (as per the /etc/ceph/ceph.conf file). Here is what I did to create and (fail to) run my first osd (osd.0): Ran the following commands: sudo -u ceph ceph osd new $(uuidgen) sudo -u ceph ceph auth get-or-create osd.0 osd 'allow *' mon 'allow profile osd' mgr 'allow profile osd' -o /var/lib/ceph/osd/ceph-0/keyring sudo -u ceph ceph-osd -i 0 --mkfs ceph osd crush add 0 2 host=ceph01 systemctl start ceph-osd@0 The osd shows up when I issue the command 'ceph osd ls'. The key shows up when I issue the command 'ceph auth ls'. But as I said above, when I issue the command 'ceph -s' it shows 'osd: 1 osds: 0 up, 0 in'. And when I look at the systemctl status for ceph-osd@0 it simply said it failed with 'exit code'. The /etc/ceph/ceph.conf listing: [global] auth_client_required = cephx auth_cluster_required = cephx auth_service_required = cephx fsid = 98e84f97-031f-4958-bd54-22305f6bc738 mon_host = ceph01 public_network = 192.168.0.0/24 [mgr] mgr_initial_modules = dashboard alerts balancer restful status [mgr.ceph01] log_file = /var/log/ceph/ceph-mgr.ceph01.log [mon] mon_initial_members = ceph01 mon_data_size_warn = 8589934592 mon_allow_pool_delete = true [mon.ceph01] host = ceph01 mon_addr = 192.168.0.10 log_file = /var/log/ceph/ceph-mon.ceph01.log [osd] allow_ec_overwrites = true osd_crush_chooseleaf_type = 1 osd_journal_size = 10240 osd_pool_default_min_size = 2 osd_pool_default_pg_num = 128 osd_pool_default_pgp_num = 128 osd_pool_default_size = 3 osd_scrub_auto_repair = true osd_scrub_begin_hour = 3 osd_scrub_end_hour = 11 pg_autoscale_mode = on [osd.0] host = ceph01 log_file = /var/log/ceph/ceph-osd.0.log [osd.1] host = ceph01 log_file = /var/log/ceph/ceph-osd.1.log [osd.2] host = ceph01 log_file = /var/log/ceph/ceph-osd.2.log So, could someone please point out to me where I'm going wrong - I know its got to be something super-simple, but this has been driving me mad for over a week now. Thanks in advance Dulux-Oz

2 years

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Re: Question about per MDS journals

by John Spray

osdc/Journaler is for RDB, client/Journaler is for CephFS. On Thu, Feb 25, 2021 at 8:26 AM 조규진 <bori19960(a)snu.ac.kr> wrote: > > Hi, John. > > Thanks for your kind reply! > > While i'm checking the code that you recommend to check and other .cc files about journal, I find that there is two Journaler class. > One is at "src/osdc/Journaler.h" and the other one is at "src/journal/Journaler.h". > If you don't mind, could you tell me which one is for MDS journal? and the differences between them? > > Thanks. > kyujin > > 2021년 2월 25일 (목) 오전 1:15, John Spray <jcspray(a)gmail.com>님이 작성: >> >> On Wed, Feb 24, 2021 at 9:10 AM 조규진 <bori19960(a)snu.ac.kr> wrote: >> > >> > Hi. >> > >> > I'm a newbie in CephFS and I have some questions about how per-MDS journals >> > work. >> > In Sage's paper (osdi '06), I read that each MDSs has its own journal and >> > it lazily flushes metadata modifications on OSD cluster. >> > What I'm wondering is that some directory operations like rename work with >> > multiple metadata and It may work on two or more MDSs and their journals, >> > so I think it needs some mechanisms to construct a transaction that works >> > on multiple journals like some distributed transaction mechanisms. >> > >> > Could anybody explains how per-MDS journals work in such directory >> > operations? or recommends some references about it? >> >> Your intuition is correct: these transactions span multiple MDS journals. >> >> The code for this stuff is somewhat long, in src/mds/Server.cc, but >> here are a couple of pointers if you're interested in untangling it: >> - Server::handle_client_rename is the entry point >> - The MDS which handles the client request sends MMDSPeerRequest >> messages to peers in rename_prepare_witness, and waits for >> acknowledgements before writing EUpdate events to its journal >> - The peer(s) write EPeerUpdate(OP_PREPARE) events to their journals >> during prepare, and EPeerUpdate(OP_COMMIT) after the first MDS has >> completed. >> >> John >> >> >> >> > >> > Thanks. >> > kyujin. >> > _______________________________________________ >> > ceph-users mailing list -- ceph-users(a)ceph.io >> > To unsubscribe send an email to ceph-users-leave(a)ceph.io

2 years

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Erasure coded calculation

by Simon Sutter

Hello everyone! I'm trying to calculate the theoretical usable storage of a ceph cluster with erasure coded pools. I have 8 nodes and the profile for all data pools will be k=6 m=2. If every node has 6 x 1TB wouldn't the calculation be like this: RAW capacity: 8Nodes x 6Disks x 1TB = 48TB Loss to m=2: 48TB / 8Nodes x 2m = 12TB EC capacity: 48TB - 12TB = 36TB At the moment I have one cluster with 8 nodes and different disks than the sample (but every node has the same amount of disks and the same sized disks). The output of ceph df detail is: --- RAW STORAGE --- CLASS SIZE AVAIL USED RAW USED %RAW USED hdd 109 TiB 103 TiB 5.8 TiB 5.9 TiB 5.41 TOTAL 109 TiB 103 TiB 5.8 TiB 5.9 TiB 5.41 --- POOLS --- POOL ID PGS STORED OBJECTS %USED MAX AVAIL device_health_metrics 1 1 51 MiB 48 0 30 TiB rep_data_fs 2 32 14 KiB 3.41k 0 30 TiB rep_meta_fs 3 32 227 MiB 1.72k 0 30 TiB ec_bkp1 4 32 4.2 TiB 1.10M 6.11 67 TiB So ec_bkp1 uses 4.2TiB an there are 67TiB free usable Storage. This means total EC usable storage would be 71.2TiB. But calculating with the 109TiB RAW storage, shouldn't it be 81.75? Are the 10TiB just some overhead (that would be much overhead) or is the calculation not correct? And what If I want to expand the cluster in the first sample above by three nodes with 6 x 2TB, which means not the same sized disks as the others. Will the calculation with the same EC profile still be the same? RAW capacity: 8Nodes x 6Disks x 1TB + 3Nodes x 6Disks x 2TB = 84TB Loss to m=2: 84TB / 11Nodes x 2m = 15.27TB EC capacity: 84TB - 15.27TB = 68.72TB Thanks in advance, Simon

2 years

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ceph slow at 80% full, mds nodes lots of unused memory

by Simon Oosthoek

Hi we've been running our Ceph cluster for nearly 2 years now (Nautilus) and recently, due to a temporary situation the cluster is at 80% full. We are only using CephFS on the cluster. Normally, I realize we should be adding OSD nodes, but this is a temporary situation, and I expect the cluster to go to <60% full quite soon. Anyway, we are noticing some really problematic slowdowns. There are some things that could be related but we are unsure... - Our 2 MDS nodes (1 active, 1 standby) are configured with 128GB RAM, but are not using more than 2GB, this looks either very inefficient, or wrong ;-) "ceph config dump |grep mds": mds basic mds_cache_memory_limit 107374182400 mds advanced mds_max_scrub_ops_in_progress 10 Perhaps we require more or different settings to properly use the MDS memory? - On all our OSD nodes, the memory line is red in "atop", though no swap is in use, it seems the memory on the OSD nodes is taking quite a beating, is this normal, or can we tweak settings to make it less stressed? This is the first time we are having performance issues like this, I think, I'd like to learn some commands to help me analyse this... I hope this will ring a bell with someone... Cheers /Simon

2 years

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List number of buckets owned per user

by Marcelo

Hello. I'm trying to list the number of buckets that users have for monitoring purposes, but I need to list and count the number of buckets per user. Is it possible to get this information somewhere else? Thanks, Marcelo

2 years

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Re: mds lost very frequently

by Stefan Kooman

Hi, After setting: ceph config set mds mds_recall_max_caps 10000 (5000 before change) and ceph config set mds mds_recall_max_decay_rate 1.0 (2.5 before change) And the: ceph tell 'mds.*' injectargs '--mds_recall_max_caps 10000' ceph tell 'mds.*' injectargs '--mds_recall_max_decay_rate 1.0' our up:active MDS stopped responding and the standby-replay stepped in ... and hit an assert (same as in this thread): 2020-02-06 16:42:16.712 7ff76a528700 1 heartbeat_map reset_timeout 'MDSRank' had timed out after 15 2020-02-06 16:42:17.616 7ff76ff1b700 0 mds.beacon.mds2 MDS is no longer laggy 2020-02-06 16:42:20.348 7ff76d716700 -1 /build/ceph-13.2.8/src/mds/Locker.cc: In function 'void Locker::file_recover(ScatterLock*)' thread 7ff76d716700 time 2020-02-06 16:42:20.351124 /build/ceph-13.2.8/src/mds/Locker.cc: 5307: FAILED assert(lock->get_state() == LOCK_PRE_SCAN) ceph version 13.2.8 (5579a94fafbc1f9cc913a0f5d362953a5d9c3ae0) mimic (stable) 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x14e) [0x7ff7759939de] 2: (()+0x287b67) [0x7ff775993b67] 3: (()+0x28a9ea) [0x5585eb2b79ea] 4: (MDCache::start_files_to_recover()+0xbb) [0x5585eb1f897b] 5: (MDSRank::active_start()+0x135) [0x5585eb146be5] 6: (MDSRankDispatcher::handle_mds_map(MMDSMap*, MDSMap*)+0x4e5) [0x5585eb151ea5] 7: (MDSDaemon::handle_mds_map(MMDSMap*)+0xca8) [0x5585eb134608] 8: (MDSDaemon::handle_core_message(Message*)+0x6c) [0x5585eb138bbc] 9: (MDSDaemon::ms_dispatch(Message*)+0xbb) [0x5585eb13929b] 10: (DispatchQueue::entry()+0xb92) [0x7ff775a56e52] 11: (DispatchQueue::DispatchThread::entry()+0xd) [0x7ff775af3e2d] 12: (()+0x76db) [0x7ff7752846db] 13: (clone()+0x3f) [0x7ff77446a88f] 2020-02-06 16:42:20.348 7ff76d716700 -1 *** Caught signal (Aborted) ** in thread 7ff76d716700 thread_name:ms_dispatch ceph version 13.2.8 (5579a94fafbc1f9cc913a0f5d362953a5d9c3ae0) mimic (stable) 1: (()+0x12890) [0x7ff77528f890] 2: (gsignal()+0xc7) [0x7ff774387e97] 3: (abort()+0x141) [0x7ff774389801] 4: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x256) [0x7ff775993ae6] 5: (()+0x287b67) [0x7ff775993b67] 6: (()+0x28a9ea) [0x5585eb2b79ea] 7: (MDCache::start_files_to_recover()+0xbb) [0x5585eb1f897b] 8: (MDSRank::active_start()+0x135) [0x5585eb146be5] 9: (MDSRankDispatcher::handle_mds_map(MMDSMap*, MDSMap*)+0x4e5) [0x5585eb151ea5] 10: (MDSDaemon::handle_mds_map(MMDSMap*)+0xca8) [0x5585eb134608] 11: (MDSDaemon::handle_core_message(Message*)+0x6c) [0x5585eb138bbc] 12: (MDSDaemon::ms_dispatch(Message*)+0xbb) [0x5585eb13929b] 13: (DispatchQueue::entry()+0xb92) [0x7ff775a56e52] 14: (DispatchQueue::DispatchThread::entry()+0xd) [0x7ff775af3e2d] 15: (()+0x76db) [0x7ff7752846db] 16: (clone()+0x3f) [0x7ff77446a88f] NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this. Quoting Yan, Zheng (ukernel(a)gmail.com): > Please try below patch if you can compile ceph from source. If you > can't compile ceph or the issue still happens, please set debug_mds = > 10 for standby mds (change debug_mds to 0 after mds becomes active). > > Regards > Yan, Zheng > > diff --git a/src/mds/MDSRank.cc b/src/mds/MDSRank.cc > index 1e8b024b8a..d1150578f1 100644 > --- a/src/mds/MDSRank.cc > +++ b/src/mds/MDSRank.cc > @@ -1454,8 +1454,8 @@ void MDSRank::rejoin_done() > void MDSRank::clientreplay_start() > { > dout(1) << "clientreplay_start" << dendl; > - finish_contexts(g_ceph_context, waiting_for_replay); // kick waiters > mdcache->start_files_to_recover(); > + finish_contexts(g_ceph_context, waiting_for_replay); // kick waiters > queue_one_replay(); > } > > @@ -1487,8 +1487,8 @@ void MDSRank::active_start() > > mdcache->clean_open_file_lists(); > mdcache->export_remaining_imported_caps(); > - finish_contexts(g_ceph_context, waiting_for_replay); // kick waiters > mdcache->start_files_to_recover(); > + finish_contexts(g_ceph_context, waiting_for_replay); // kick waiters > > mdcache->reissue_all_caps(); > mdcache->activate_stray_manager(); AFAICT this patch has never been tested and never commited. Do you still think this might fix the issue? Any hints on how we might reproduce this issue: failing active mds and hitting this specific recovery scenario We will happily apply this patch and do testing to check if it really fixes the issue. Gr. Stefan P.s. For my understanding: the MDS should never stop responding by setting these parameters, right? -- | BIT BV https://www.bit.nl/ Kamer van Koophandel 09090351 | GPG: 0xD14839C6 +31 318 648 688 / info(a)bit.nl

2 years

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Default data pool in CEPH

by Gabriel Medve

Hi, I have a CEPH 15.2.4 running in a docker. How to configure for use a specific data pool? i try put the follow line in the ceph.conf but the changes not working. . [client.myclient] rbd default data pool = Mydatapool I need it to configure for erasure pool with cloudstack Can help me? , where is the ceph conf we i need configure? Thanks. -- Untitled Document

2 years

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ceph-users February 2021