#ceph IRC Log

Index

IRC Log for 2016-07-07

Timestamps are in GMT/BST.

[0:01] * rendar (~I@host241-113-dynamic.51-82-r.retail.telecomitalia.it) Quit (Quit: std::lower_bound + std::less_equal *works* with a vector without duplicates!)
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[0:18] <m0zes> If I'm using the rados from the cli, is there any way to set a timeout on particular operations? or any operations?
[0:20] <m0zes> I'm in a recovery situation, and I need to extract data from my cephfs metadata pool. some of the pgs are peering/activating (for weeks due to leveldb size). I'd like to just timeout some rados operations, as of now, they seem to hang indefinitely when waiting for data from these pgs.
[0:21] * stiopa (~stiopa@cpc73832-dals21-2-0-cust453.20-2.cable.virginm.net) Quit (Ping timeout: 480 seconds)
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[0:29] <badone> kazer: there's some sort of network problem there it looks like, after that message ceph will back off and try again so it may be intermittent I guess
[0:29] <badone> kazer: try something like netperf/iperf between the nodes?
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[0:37] * dneary (~dneary@nat-pool-bos-u.redhat.com) Quit (Ping timeout: 480 seconds)
[0:38] <cholcombe> are all regions within the ceph radosgw federated master writable or just the master within that region?
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[1:21] <kazer> badone: there's an issue with my network link indeed. Looking into it, thanks
[1:32] * Peaced (~PappI@61TAAAASB.tor-irc.dnsbl.oftc.net) Quit ()
[1:38] * kuku (~kuku@119.93.91.136) Quit (Ping timeout: 480 seconds)
[1:39] <badone> kazer: np
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[4:07] <jiffe> so I have an import going and ceph seems to be hung saying 3 requests are blocked > 32 sec
[4:07] <jiffe> other than that I don't see any problems
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[4:48] <badone> jiffe: do they stay blocked?
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[6:14] * hellertime (~Adium@a72-246-0-10.deploy.akamaitechnologies.com) has joined #ceph
[6:15] <hellertime> are there any configuration guides for running a cephfs with a large number of concurrent operations? I seem to very rapidly be able to get my mds 'behind on trimming' and it stalls out everything using cephfs???
[6:16] * MentalRay (~MentalRay@LPRRPQ1401W-LP130-02-1242363207.dsl.bell.ca) Quit (Quit: My Mac has gone to sleep. ZZZzzz???)
[6:16] * gauravbafna (~gauravbaf@122.178.243.68) has joined #ceph
[6:16] <hellertime> this is with 0.94.3 cephfs
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[6:50] <skraito> <RabbitKing> hi
[6:50] <skraito> * Jucato has quit (Quit: Konversation terminated!)
[6:50] <skraito> <RabbitKing> want tutorial phyton lover
[6:50] <skraito> <RabbitKing> come to ##xWindow
[6:50] <skraito> <eevee> stealth_: it is much more confusing. if i see "say_hi" and i want to know what it is, i can just look at the top of the file to see where it's imported from
[6:50] <skraito> <RabbitKing> top notch document from me
[6:50] <skraito> <RabbitKing> there is proxy in it
[6:50] <skraito> <RabbitKing> you need to join ##xWindow to open it
[6:50] <skraito> freenode
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[9:13] <acctor> hello, I am trying to understand the ???exclusive-lock??? feature on rbd. I thought that it would prevent two clients from using an image at the same time, but I can attach the volume to two qemu instances via libvirt and both seem to still be able to write. Have I misunderstood this feature?
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[9:17] <Hatsjoe> http://lists.ceph.com/pipermail/ceph-users-ceph.com/2015-September/004857.html
[9:17] <Hatsjoe> acctor
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[9:20] <acctor> Hatsjoe: thanks - yeah I read this but I couldn???t quite determine from the wording whether the lock was held for the duration of the image being mapped, or whether the exclusive lock was only held when a write is attempted
[9:21] <Hatsjoe> "Behind the scenes, librbd will detect that another client currently owns the lock and will proxy its request over to the current watch owner. This ensures that we only have one client modifying the image while at the same time not crippling other use cases."
[9:21] <Hatsjoe> If I understand that line correctly, it proxies the request to the lock holder
[9:21] <Hatsjoe> Not sure tho
[9:21] <acctor> that sounded to me like snapshot and clone functionality, not all block writes
[9:21] <acctor> but again, wasn???t sure :)
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[9:22] <Hatsjoe> Perhaps someone with more knowledge about exclusive-lock might be able to answer your question :)
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[9:25] <acctor> I found this too: https://access.redhat.com/documentation/en/red-hat-ceph-storage/1.3/red-hat-ceph-architecture/chapter-2-ceph-client-architecture
[9:25] <acctor> which states ??? It also provides some protection for failed clients. For instance, if a virtual machine seems to be unresponsive and you start a copy of it with the same disk elsewhere, the first one will be blacklisted in Ceph and unable to corrupt the new one.???
[9:26] <acctor> but I haven???t been able to demonstrate that behavior yet
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[10:45] <levak> hey there!
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[10:45] <levak> guys, I'm planning a ceph cluster and I'm wondering what is the req. for monitor nodes
[10:45] <levak> can then be virtual or is it better to have physical servers?
[10:45] <levak> and what specs?
[10:46] <Hatsjoe> They can be virtual, they do not require heavy specs
[10:46] <Hatsjoe> They should be an uneven number (no hard requirement) and a minimum of 3
[10:48] <Hatsjoe> http://docs.ceph.com/docs/jewel/start/hardware-recommendations/
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[10:49] <levak> Hatsjoe: ok... because all my physical servers are dual core E5 with 64GB memory
[10:49] <levak> and that seems like a bit too much for monitor
[10:49] <levak> they dont need 32 cores
[10:50] <Hatsjoe> Exactly.
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[10:53] <levak> Hatsjoe: when are monitors under load, under what conditions?
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[10:57] <Hatsjoe> Im not an expert on that level, but I'd say when the client requests the cluster map
[10:58] <Hatsjoe> Which is not CPU intensive
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[11:02] <levak> Hatsjoe: thanks for info
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[11:16] <chengpeng> verify_reply couldn't decrypt with error: error decoding block for decryption
[11:17] <chengpeng> all mon host time are the same
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[11:18] <chengpeng> MSG badone verify_reply couldn't decrypt with error: error decoding block for decryption
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[11:21] <chengpeng> anyone here?
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[12:56] <Anticimex> sage: major nit, but still: the href formatting of "the complete changelog" link at http://ceph.com/releases/v10-2-2-jewel-released/ is broken
[12:56] <Anticimex> <p>For more detailed information, see <a href="http://GETTING CEPH Git at git://github.com/ceph/ceph.git Tarball at http://ceph.com/download/ceph-10.2.1.tar.gz For packages, see http://ceph.com/docs/master/install/get-packages For ceph-deploy, see http://ceph.com/docs/master/install/install-ceph-deploy">the complete changelog</a>.</p>
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[14:11] <hellertime> what can be done to improve chances an mds won't get 'behind on trimming'?
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[15:19] <- *johnavp1989* To prove that you are human, please enter the result of 8+3
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[16:20] <turmeric> ahoj guys
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[18:34] <wes_dillingham> is it possible to do parallel reads in a replicated pool?
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[18:39] <georgem> wes_dillingham: reads are only served by the primary replica
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[18:46] <wes_dillingham> georgem: thats what im seeing. wondering if it could be toggled such that this wasnt necessarily the case.
[18:47] <georgem> wes_dillingham: no, but the data is cached by the primary replica so the second request will not hit the disk
[18:48] <wes_dillingham> georgem: thats good to know, thank you.
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[18:49] <koszik> pgs are distributed so that every osd is primary for some, so if you have a distributed workload reads will be hitting every disk you have; of course, that won't help you with single thread accces
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[18:52] <wes_dillingham> koszik: thanks, I am just thinking about having multiple rbd children all trying to read from the same objects in the parent???. I dont think that will particularly happen, just mulling it over as a possibility and how I can best deal with such a scenario before it happens
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[19:01] <georgem> wes_dillingham: if you have 50 VMs started from a cloned volume and they all read the same file in the parent RBD, performance should be good
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[19:25] <axion6joey> Hi Everyone
[19:25] <axion6joey> has anyone ever seen failed heartbeat checks between osd's on the same node?
[19:26] <axion6joey> I see this appearing in /var/log/messages
[19:26] <axion6joey> Jul 7 09:56:29 cephosdnj2 ceph-osd: 2016-07-07 09:56:29.563089 7f0603419700 -1 osd.12 1613 heartbeat_check: no reply from osd.11 since back 2016-07-07 09:56:08.785665 front 2016-07-07 09:56:08.785665 (cutoff 2016-07-07 09:56:09.563086) Jul 7 09:56:30 cephosdnj2 ceph-osd: 2016-07-07 09:56:30.392765 7f05e8d89700 -1 osd.12 1613 heartbeat_check: no reply from osd.11 since back 2016-07-07 09:56:08.785665 front 2016-07-07 0
[19:27] <axion6joey> at the same time the ceph log shows slow requests and the vm's running on ceph hang for a few minutes
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[19:31] <axion6joey> I searched the mailing list archives
[19:31] <axion6joey> I've seen similar issues between nodes, but never on the same node
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[20:00] <nate_b> Hey, hopefully this is an easy one: I have 1 PG stuck in active+remapped, that I cannot figure out how to fix. I am upgraded from hammer to jewel, broke all my clients by setting tunables to jewel, so re-set to bobtail and now have 1 stuck pg of 328.
[20:00] <nate_b> all OSD's and Mon's are active, up and in
[20:00] <hellertime> does 'ceph pg <pgid> query' show anything useful?
[20:02] <nate_b> well, it says a lot ... what would be most interesting to see?
[20:03] <nate_b> i've got 15 osds. only 9 and 10 show up for this pg
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[20:03] <nate_b> acting shows 10,9,0 and actingbackfill shows 0,9,10
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[20:06] <nate_b> that pg shows a recovery_state in the query results.
[20:07] <nate_b> but it seems like all the progress array fields are empty
[20:08] <nate_b> similarly might_have_unfound is empty
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[20:08] <blizzow> Yo cephlogbot, @help
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[20:09] <blizzow> cephlogbot !help
[20:09] <blizzow> Where?
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[20:09] <blizzow> What advantages does converting my image files to format 2 from format 1 get me?
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[20:10] <koszik> ormat 2 - Use the second rbd format, which is supported by librbd and kernel since version 3.11 (except for striping). This adds support for cloning and is more easily extensible to allow more features in the future.
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[20:14] <blizzow> ah. cool, thanks koszik
[20:14] <blizzow> looks like it's a PITA to clone compared to copy.
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[20:23] <nate_b> AFAIK my cluster is healthy but for 1 PG that has only 2 osd's listed in up, but 3 in acting. How do I get the one in acting to be in up?
[20:24] <axion6joey> nate have you tried to repair it?
[20:24] <axion6joey> I had to the that yesterday and it worked perfectly.
[20:25] <nate_b> with: ceph pg repair <pgid>, ? yes, it doesn't seem to have done anything...
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[20:25] <axion6joey> in the logs do you see that it is trying to repair it after you run that command?
[20:25] <nate_b> it says its instructing that pg to repair on the primary OSD, but nothing seems to have changed 30+ minutes later
[20:26] <nate_b> letmesee
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[20:28] <nate_b> the audit log shows a dispatch record for the request...
[20:29] <nate_b> should the OSD show something as well?
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[20:30] <axion6joey> I've only had a ceph cluster running for about 3 months, so my knowledge is really basic
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[20:31] <nate_b> well, I'm on week number 2 .....
[20:32] <axion6joey> ha ha
[20:32] <axion6joey> I'm battling an issue right now that I think is related to the Avago/LSI controller
[20:32] <axion6joey> how many osd nods in your cluster?
[20:34] <nate_b> 15 OSD's spread over 3 nodes
[20:35] <nate_b> only thing for that pg in the logs is some activity about ops and then cancelling recovery and clearing recovery state...
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[20:49] <axion6joey> does anyone know if it's possible to determine if "slow requests" are read requests or write requests?
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[20:55] <infernix> how expensive is a rados getomapval?
[20:55] <infernix> does that come from memory or is there a disk lookup somewhere?
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[21:03] <neurodrone_> If I want to distribute 3 copies such that -> there should be 2 copies in one rack and 1 in the other - is there a specific Ceph crush rule I should be using?
[21:03] <neurodrone_> Those 2 copies can be in any rack, but there should be 1 copy in the other rack whichever rack is chosen for the first set.
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[21:11] <jhp> Hi everyone. Quick question. I'm currently testing Ceph 10.2.2 for deploy in a Centos7 environment. I picked the 10.x tree because it should work in a SystemD environment.
[21:12] <jhp> I installed the first mon daemon and I configured an alternative cluster name. But the startup now failes because it can't find a file which starts with ceph instead of the new name.
[21:12] <jhp> monitor data directory at '/var/lib/ceph/mon/ceph-blsceph01-1' does not exist: have you run 'mkfs'?
[21:13] <jhp> The directory that does exist is named: /var/lib/ceph/mon/blsceph01-blsceph01-1/
[21:13] <jhp> Clustername is going to be blsceph01 and the hostname of this node is blsceph01-1
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[21:45] <hellertime1> is there any better documentation on 'ceph mon force sync'? the current docs are pretty much that. 'force sync and clear'
[21:47] <acctor> jhp: the directory names look different
[21:47] <jhp> Yes. Found the issue.
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[21:47] <borei> hi all
[21:48] <borei> i have quick qestion about journal sizing
[21:48] <jhp> The clustername is in the Systemd file but, although i configured the clustername to be blsceph01, the systemd file still stated the clustername was ceph.
[21:48] <borei> there is recommendation that journal should be abel to handle ~20 seconds of traffic (i saw that number).
[21:48] <jhp> acctor, The result was that the deploy process created everything with the given clustername, but the startup process was not able to start it because it had the wrong cluster name.
[21:49] <borei> on the 10G network we are talking about 20-25G
[21:49] <acctor> ah ok - that makes sense
[21:49] <borei> is it correct math ?
[21:49] <jhp> acctor, I think this is a bug in the setup scripting (ceph-deploy).
[21:50] <borei> second question
[21:50] <jhp> acctor, I will try to create a bug report for this later on.
[21:51] <borei> i know that it's not recommended to place journal on the OSD disk. comparing disk throughput (linear write from /dev/zero) is pushing me to place it on the OSD disk
[21:52] <borei> from the architecture prospective i don't want to do it
[21:52] <borei> OSD backend is 400G SSD.
[21:53] <borei> hoocked up into 12G controller
[21:53] <borei> im getting ~500Mb/s write
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[21:54] <T1> borei: the journal should be able to take the pressure off of the OSD disk - so it can write in bursts for a few seconds
[21:55] <T1> borei: afair the various tools default to 5GB journals
[21:56] <T1> and finally.. using SSD based journals for OSDs that has SSD data disks is does not give you anything
[21:56] <T1> by design the journals should be on faster than the OSDs data disks
[21:56] <borei> true
[21:57] <T1> so you should go for NVMe as journals for that
[21:57] <borei> not an option for now
[21:57] <T1> then just dont use a journal
[21:57] <borei> at all ?
[21:58] <borei> i'll put it on OSD backend
[21:58] <T1> it only adds complexity
[21:58] <T1> no
[21:58] <T1> never do that
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[21:58] <T1> the OSD should have all IO it can
[21:58] <borei> is it possible not to use journal ?
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[21:58] <T1> I belive so
[21:58] <T1> never did without myself, but it should be possible
[21:59] <T1> (I've only god rotating rust for OSD data..)
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[22:00] <borei> erherh to dangerous
[22:01] <borei> ok, i'll place it on the separate disk, will need to encrease budget a bit for NVMe
[22:02] <T1> and remember that if you loose the journal you loose the entire OSD
[22:02] <T1> so make sure to balance the journals for multiple OSDs on more than a single device
[22:03] <T1> I've accepted software raid1 (md-raid) for journals
[22:03] <borei> does it make sense ti have nvm is raid 1?
[22:03] <T1> my few tests did not show any slowdown
[22:03] <borei> or :-)
[22:03] <borei> oh :-)
[22:03] <borei> i was typing at the same time
[22:04] <borei> good good
[22:04] <T1> I'm not exactly sure nvme in raid1 makes sense, but.. :)
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[22:05] <T1> for a OSD safety point of view it could probably be considered
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[22:10] <jhp> Why do you loose the OSD when your journal disk fails? I would suspect that all written data is done.
[22:11] <jhp> T1, Could you elaborate on that?
[22:15] <T1> jhp: depending on how/when the journal device dies you will most likely end up with an OSD that does not have everything that should have been written to it
[22:15] <borei> will it be the same situation like when battry will die on your RAID controller ?
[22:15] <T1> no
[22:15] <T1> a write is ACK'ed once it's been written to the journal
[22:16] <T1> if the journal dies before flush to data disk you end up with a problem if that data is the primary copy
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[22:17] <T1> see http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/6374
[22:17] <T1> allthough leseb has written this: http://ceph.com/planet/ceph-recover-osds-after-ssd-journal-failure/
[22:19] <jhp> Thanks, will read that.
[22:19] <T1> since ceph makes sure the data is safe (since the write is ALSO only ACK'ed after _all_ copies have been written) destroying the OSD and recreating it is easier than hoping that the journal has been flushed before failure
[22:19] <jhp> Should the journal drive for an OSD also be XFS ?
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[22:19] <T1> no, raw device
[22:19] <jhp> ok
[22:19] <T1> the disk-based default one is a large binary file
[22:20] <jhp> Can it be a logical volume?
[22:20] <T1> it depends on whether or not you point it to a file or device
[22:20] <T1> a LVM volume?
[22:20] <T1> yes
[22:20] <jhp> Yes, LVM volume.
[22:20] <T1> but note that ceph-deploy and ceph-disk might not do what you expect
[22:21] <jhp> I'm planning to put my OSD's on Samsung 1TB SSD drives. And the Journals will be on Intel Enterprise grade SSD drives.
[22:21] <T1> I just accepted to create a file based journal
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[22:21] <T1> the stopped the OSD before any data was placed on it
[22:21] <jhp> The last ones are much faster so that should be fine.
[22:21] <T1> remove the file
[22:21] <T1> and make a symblink to the original file pointing to a device of some sort
[22:21] <T1> then start the OSD
[22:22] <T1> .. I might have initialized the journal before tart, but I can't remember right now.. :)
[22:22] <T1> start even
[22:23] <jhp> Thanks.
[22:23] <T1> np np
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[22:23] <T1> but make sure the OSD does not hold data OR flush the journal before replacing anything..
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[22:37] <jhp> Ok, first try failed. ceph-deploy does a parted command against the LVM and this returns an error. The command used only gives something usable against an raw disk (/dev/sda)
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[22:40] <acctor> w.r.t the exclusive-lock feature on a volume: could anyone confirm that it does not prevent two running qemus with the same device attached from writing to the same volume due to the fact that a client that does not have the lock will request it on write, and that librbd will give up a lock to a client that requests it, therefore the lock will just move between the two qemus continuously?
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[22:59] <T1> jhp: exactly..
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[23:12] <hellertime1> is osd pool information stored in the osd or in the monitor store?
[23:15] <chutz> so we are having a problem where "rbd map" and "rbd unmap" are hanging randomly, both seem to hang in kernel code, map appears to hang when trying to obtain a spinlock, and unmap seems to hang when trying to obtain a writer semaphore
[23:19] <untoreh> systemd hangs when rebooting the host when there are cephfs mounts :(
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