Hi Frank, I'm glad this thread is more about understanding what's going on, as opposed to a quick fix. Normally people in this situation should just zap and redeploy, like you said. The next thing I'd do is fuse-mount the OSD and see which osdmaps it has -- try to read them, etc. Does the OSD have the osdmap epoch it is warning about in the logs? ceph-objectstore-tool --data-path </path/to/osd> --op fuse --mountpoint /mnt Inside /mnt you'll see the PGs and a meta folder, IIRC. Inside meta you will find the osdmaps. Cheers, dan -- Dan van der Ster CTO @ CLYSO https://clyso.com | dan.vanderster@xxxxxxxxx On Tue, Oct 22, 2024 at 12:14 AM Frank Schilder <frans@xxxxxx> wrote: > > Hi Dan, > > I don't remember exactly when I took them down. Maybe a month ago? The reason was a fatal IO error due to connectivity issues. Its 2 SSDs with 4 OSDs each and they were installed in JBODs. We have 12 of those and, unfortunately, it seems that 3 have issues with SSDs even though they have dedicated slots for SSD/NVMe drives. The hallmark are SAS messages containing "blk_update" (usually blk_update_request with a drive reset). Any attempts to fix that (reseating, moving etc.) failed. We had like 40-50 messages per disk per hour in the log, didn't impact performance though. So it was a nuisance on the lower priority list. > > Some time ago, maybe a month, in one of these JBODs the connection finally gave up. For both SSDs at the same time. I'm pretty sure it was a bus error and the disks are fine. I stopped these OSDs and the data is recovered, no problems here. The disks are part of our FS meta data pool and we have plenty, so there was no rush. They store a ton of objects though and I try to avoid having a full re-write of everything (life-time fetishist). > > Yesterday, we started a major disk replacement operation after evacuating about 40 HDDs. As part of this, we move all SSDs from the JBODs to the servers and I tried to get these two disks up yesterday with the result reported below. We are not done yet with the maintenance operation and I can pull logs after we are done. Possibly next week. We are not in a rush to get these disks back up and I'm also prepared to just zap and redeploy these. > > My interest with this case is along the lines "I would like to know what is going on" and "is there a better way than zap+redeploy". Others might be in a situation where they don't have the luxury of all data being healthy and we have a chance to experiment without any risk. > > Best regards, > ================= > Frank Schilder > AIT Risø Campus > Bygning 109, rum S14 > > ________________________________________ > From: Dan van der Ster <dan.vanderster@xxxxxxxxx> > Sent: Tuesday, October 22, 2024 12:04 AM > To: Frank Schilder > Cc: ceph-users@xxxxxxx > Subject: Re: failed to load OSD map for epoch 2898146, got 0 bytes > > Hi Frank, > > Do you have some more info about these OSDs -- how long were they down > for? Were they down because of some IO errors? > > Is it possible that the OSD thinks it stored those osdmaps but IO > errors are preventing them from being loaded? > > I know the log is large, but can you share at least a snippet of when > this starts? Preferably with debug_osd = 10. > > Thanks, Dan > > -- > Dan van der Ster > CTO @ CLYSO > https://clyso.com | dan.vanderster@xxxxxxxxx > > On Mon, Oct 21, 2024 at 1:32 PM Frank Schilder <frans@xxxxxx> wrote: > > > > Hi Dan, > > > > maybe not. Looking at the output of > > > > grep -B 1 -e "2971464 failed to load OSD map for epoch 2898132" /var/log/ceph/ceph-osd.1004.log > > > > that searches for lines that start a cycle and also print the line before, there might be some progress, but I'm not sure: > > > > 2024-10-21T17:41:40.173+0200 7fad509a1700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898208, got 0 bytes > > 2024-10-21T17:41:40.173+0200 7fad4a194700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > -- > > 2024-10-21T17:41:40.610+0200 7fad519a3700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898678, got 0 bytes > > 2024-10-21T17:41:40.610+0200 7fad4e19c700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > -- > > 2024-10-21T17:41:41.340+0200 7fad4c198700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898293, got 0 bytes > > 2024-10-21T17:41:41.340+0200 7fad4f19e700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > -- > > 2024-10-21T17:41:41.347+0200 7fad4e99d700 -1 osd.1004 2971464 failed to load OSD map for epoch 2899238, got 0 bytes > > 2024-10-21T17:41:41.347+0200 7fad4c999700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > > > The loop seems to run longer and longer. Problem is though that by the time it got here it already wrote like 1G log. The loop seems to repeat over all epochs for each such iteration, so the log output is quadratic in the number of epochs to catch up with. I still have like 100000 to go and I doubt I have disks large enough to collect the resulting logs. The logging probably also a total performance killer. > > > > Is it possible to suppress the massive log spam so that I can let it run until it is marked up? These messages seem not to be related to a log level. If absolutely necessary, I could start the OSD manually with logging to disk disabled. > > > > Thanks and best regards, > > ================= > > Frank Schilder > > AIT Risø Campus > > Bygning 109, rum S14 > > > > ________________________________________ > > From: Dan van der Ster <dan.vanderster@xxxxxxxxx> > > Sent: Monday, October 21, 2024 9:03 PM > > To: Frank Schilder > > Cc: ceph-users@xxxxxxx > > Subject: Re: failed to load OSD map for epoch 2898146, got 0 bytes > > > > Hi Frank, > > > > Are you sure it's looping over the same epochs? > > It looks like that old osd is trying to catch up on all the osdmaps it > > missed while it was down. (And those old maps are probably trimmed > > from all the mons and osds, based on the "got 0 bytes" error). > > Eventually it should catch up to the current (e 2971464 according to > > your log), and then the PGs can go active. > > > > Cheers, Dan > > > > -- > > Dan van der Ster > > CTO @ CLYSO > > https://clyso.com | dan.vanderster@xxxxxxxxx > > > > > > > > > > On Mon, Oct 21, 2024 at 9:13 AM Frank Schilder <frans@xxxxxx> wrote: > > > > > > Hi all, > > > > > > I have a strange problem on an octopus latest cluster. We had a couple of SSD OSDs down for a while and brought them up today again. For some reason, these OSDs don't come up and flood the log with messages like > > > > > > osd.1004 2971464 failed to load OSD map for epoch 2898146, got 0 bytes > > > > > > These messages cycle through the same epochs over and over again. I did not really fine too much help, there is an old thread about a similar/the same problem on a home lab cluster, with new OSDs though, I believe. I couldn't really find useful information. The OSDs seem to boot fine and then end up in something like a death loop. Below some snippets from the OSD log. > > > > > > Any hints appreciated. > > > Thanks and best regards, > > > Frank > > > > > > After OSD start, everything looks normal up to here: > > > > > > 2024-10-21T17:41:39.136+0200 7fad73cf6f00 0 osd.1004 2971464 load_pgs opened 205 pgs > > > 2024-10-21T17:41:39.140+0200 7fad73cf6f00 -1 osd.1004 2971464 log_to_monitors {default=true} > > > 2024-10-21T17:41:39.150+0200 7fad73cf6f00 -1 osd.1004 2971464 mon_cmd_maybe_osd_create fail: 'osd.1004 has already bound to class 'fs_meta', can not reset class to 'ssd'; use 'ceph osd crush > > > rm-device-class <id>' to remove old class first': (16) Device or resource busy > > > 2024-10-21T17:41:39.155+0200 7fad519a3700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad511a2700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad511a2700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898133, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad511a2700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898134, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad511a2700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898135, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad511a2700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898136, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4f99f700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4f99f700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898133, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898132, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898133, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898134, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898135, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898136, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898137, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad73cf6f00 0 osd.1004 2971464 done with init, starting boot process > > > 2024-10-21T17:41:39.155+0200 7fad73cf6f00 1 osd.1004 2971464 start_boot > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898138, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898139, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898140, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898141, got 0 bytes > > > 2024-10-21T17:41:39.155+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898142, got 0 bytes > > > 2024-10-21T17:41:39.156+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898143, got 0 bytes > > > 2024-10-21T17:41:39.156+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898144, got 0 bytes > > > 2024-10-21T17:41:39.156+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898145, got 0 bytes > > > 2024-10-21T17:41:39.156+0200 7fad4b196700 -1 osd.1004 2971464 failed to load OSD map for epoch 2898146, got 0 bytes > > > > > > > > > These messages repeat over and over again with some others of this form showing up every now and then: > > > > > > 2024-10-21T17:41:39.476+0200 7fad651ca700 4 rocksdb: [db/compaction_job.cc:1332] [default] [JOB 12] Generated table #82879: 76571 keys, 67866714 bytes > > > 2024-10-21T17:41:39.688+0200 7fad651ca700 4 rocksdb: EVENT_LOG_v1 {"time_micros": 1729525299690000, "cf_name": "default", "job": 12, "event": "table_file_creation", "file_number": 82879, "file_size": 67866714, "table_properties": {"data_size": 67111697, "index_size": 562601, "filter_size": 191557, "raw_key_size": 4823973, "raw_average_key_size": 63, "raw_value_size": 62631087, "raw_average_value_size": 817, "num_data_blocks": 15644, "num_entries": 76571, "filter_policy_name": "rocksdb.BuiltinBloomFilter"}} > > > > > > > > > And another occasion: > > > > > > 2024-10-21T17:41:40.520+0200 7fad651ca700 4 rocksdb: [db/compaction_job.cc:1332] [default] [JOB 12] Generated table #82880: 76774 keys, 67868330 bytes > > > 2024-10-21T17:41:40.520+0200 7fad501a0700 -1 osd.1004 2971464 failed to load OSD map for epoch 2899234, got 0 bytes > > > 2024-10-21T17:41:40.520+0200 7fad501a0700 -1 osd.1004 2971464 failed to load OSD map for epoch 2899235, got 0 bytes > > > 2024-10-21T17:41:40.520+0200 7fad501a0700 -1 osd.1004 2971464 failed to load OSD map for epoch 2899236, got 0 bytes > > > 2024-10-21T17:41:40.520+0200 7fad651ca700 4 rocksdb: EVENT_LOG_v1 {"time_micros": 1729525300521403, "cf_name": "default", "job": 12, "event": "table_file_creation", "file_number": 82880, "file_size": 67868330, "table_properties": {"data_size": 67113021, "index_size": 562509, "filter_size": 191941, "raw_key_size": 4836742, "raw_average_key_size": 62, "raw_value_size": 62623274, "raw_average_value_size": 815, "num_data_blocks": 15630, "num_entries": 76774, "filter_policy_name": "rocksdb.BuiltinBloomFilter"}} > > > > > > ================= > > > Frank Schilder > > > AIT Risø Campus > > > Bygning 109, rum S14 > > > _______________________________________________ > > > ceph-users mailing list -- ceph-users@xxxxxxx > > > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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