#ceph IRC Log

Index

IRC Log for 2015-05-19

Timestamps are in GMT/BST.

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[0:47] <Nats_> if all the disks are the same type, you should colocate the journal
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[5:14] <- *flisky* anyone here?
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[8:31] <Be-El> hi
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[8:32] <SamYaple> hello Be-El
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[9:30] <dschneller> Does anyone have any idea regarding http://tracker.ceph.com/issues/11677? I created it last night, our cluster is constantly dying ATM, impacting production availability.
[9:32] <dschneller> OSDs keep crashing over and over again.
[9:32] <dschneller> ANY help would be greatly appreciated.
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[9:42] <rkeene> dschneller, Are you using the new image options to make exclusive images ?
[9:43] <rkeene> When I tried that... it didn't work, likely the OSDs crashed (I don't remember) and it could be the same crash here.
[9:43] <rkeene> Certainly dying in ObjectContext::RWState::put_excl() is suggestive of something
[9:44] <rkeene> But without understanding the code more I can't say too much :-)
[9:44] <dschneller> No, no special options.
[9:45] <rkeene> Any locks on any images ?
[9:45] <dschneller> What kind of locks do you mean?
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[9:45] <dschneller> We have set of VMs running on top of RBD backed volumes.
[9:45] <dschneller> Those have been running for a long time.
[9:45] <dschneller> We are currently suspecting something related to Rados Gateway.
[9:46] <rkeene> rbd lock ls
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[9:52] <rkeene> I don't see anything in Ceph 0.94.1 that calls get_excl()... so I'm not sure who is calling put_excl... There are some references to put_excl in the snapshot/PG replication code...
[9:52] <dschneller> As mentioned in the bug, yesterday we created a snapshot for testing purposes and almost immediately deleted it again.
[9:52] <dschneller> other snapshot creation/deletion has been disabled for weeks.
[9:53] <dschneller> However, we snapshot only the RGW pools.
[9:53] <dschneller> That is -> we _did_, currently disabled.
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[9:54] <rkeene> Can you run the OSD with a debug level of 20 or greater ?
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[9:55] <dschneller> did that. in the ticket there is link to logs of three crashing OSDs with 20.
[9:55] <dschneller> 3 OSDs, all crashed around 3:40 this morning.
[9:58] <dschneller> thanks for checking it out
[9:58] <rkeene> I'm just reading through the code -- never looked at it before, so takes some time
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[10:00] <dschneller> much appreciated
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[10:09] <rkeene> I guess the most interesting thing to know is if get_excl was ever called
[10:10] <dschneller> What would it try to get exclusively?
[10:12] <rkeene> Opening something for READ and WRITE, apparently
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[10:14] <rkeene> You would see something like "waiting for rw locks" in the log at debug level 20 when th locks are acquired
[10:15] <rkeene> Unless it was able to acquire the lock immediately, then ... not sure
[10:16] <rkeene> It's in the ReplicatedPG::do_op() function, so you should see a message about "do_op ...." at debug level 10 when that function is called
[10:16] <rkeene> Nothing that says "do_op" on the ticket though
[10:17] <rkeene> Is that in the ceph-osd.5.log file referenced ?
[10:18] <rkeene> Ultimately, FWIW, the crash appears to be a put_excl called without a matching get_excl
[10:19] <rkeene> (Where put_excl releases a lock and get_excl obtains a lock)
[10:19] <dschneller> I will check in a few moments.
[10:20] <rkeene> Interested particularly if do_op ... -> write-ordered or do_op ... -> read-ordered is present
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[10:33] <dschneller> This is the OSD.5 log right before the crash
[10:33] <dschneller> http://pastebin.com/raw.php?i=W0srF0bW
[10:33] <dschneller> There is "write-ordered" present
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[10:40] <rkeene> One workaround might be to enable "skiprwlocks"
[10:40] <rkeene> I'm just not sure about how to do that, or what the side-effects would be :-)
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[10:42] <rkeene> Doesn't look like something you can do... Nevermind
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[10:51] <rkeene> The code stack is getting too deep for me to keep in my head... Might be best to wait for someone else to take a look at it, definitely should have enough logs there with the last one (there's only one message printed at level 30, and it doesn't look important)
[10:51] <dschneller> From the website docs I gathered that 20 was the maximum log level?
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[10:52] <rkeene> There's definitely something printed at level 30
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[10:53] <rkeene> Highest value I see is 35
[10:54] <rkeene> But above 20 there's: 25, 30, and 35
[10:57] <dschneller> hm. strange. I have seen several bug tickets etc. where InkTank people asked for level 20. That in combination with the documentation gave me that impression. Nevertheless, the fact that these log messages exist proves that wrong :)
[10:59] <theanalyst> has anyone tweaked around with mon_pg_warn_max_object_skew setting
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[12:05] <dschneller> Any "geek on duty" willing to lend a hand to our production issue? We are starting to get really desperate here...
[12:06] <dschneller> Short recap: (http://tracker.ceph.com/issues/11677): OSDs crashing in waves, about every 30-60 minutes, taking our prod system down. Respawn after a while, rinse and repeat.
[12:06] <dschneller> OSD Logs with the Crash, debug_osd=20 are available. We can also try to provide any other information needed.
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[12:08] <dschneller> Sitting in front of the system, pretty helpless.
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[12:35] <Guest5674> Hello, I hope someone is willing to help me setting up ceph on fedora 21
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[12:38] <Guest5674> The problem seems to be that there is no fc21 repository for Hammer. Also referring to the fc20 repo in /etc/yum.repos.d/ceph.repo file does not make ceph-deploy look for the ceph repository for fedora 20. It insists on looking in the fc21 directory, which does not exist.
[12:38] <Guest5674> ceph-deploy install novamaris
[12:39] <Guest5674> gives in the end:
[12:39] <Guest5674> Running command: rpm -Uvh --replacepkgs --force --quiet http://ceph.com/rpm-hammer/fc21/noarch/ceph-release-1-0.fc21.noarch.rpm
[12:39] <Guest5674> [novamaris][WARNIN] curl: (22) The requested URL returned error: 404 Not Found
[12:39] <Guest5674> [novamaris][WARNIN] error: skipping http://ceph.com/rpm-hammer/fc21/noarch/ceph-release-1-0.fc21.noarch.rpm - transfer failed
[12:39] <Guest5674> [novamaris][ERROR ] RuntimeError: command returned non-zero exit status: 1
[12:39] <Guest5674> [ceph_deploy][ERROR ] RuntimeError: Failed to execute command: rpm -Uvh --replacepkgs --force --quiet http://ceph.com/rpm-hammer/fc21/noarch/ceph-release-1-0.fc21.noarch.rpm
[12:40] <Guest5674> So, is there a way around this?
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[13:26] <Guest5674> Hello?
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[13:42] <daviddcc> Hello Guest5674, compile your ceph with last git clone Hammer
[13:42] <daviddcc> (not master)
[13:42] <Guest5674> ok, so not simply download the tarball.
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[13:45] <daviddcc> I find that it works better with git clone + "autogen.sh; configure; make -j <Num CPU> --without-XXX"
[13:46] <Guest5674> <searching for the right git command>
[13:49] <Guest5674> git clone --recursive https://github.com/ceph/ceph.git
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[13:56] <daviddcc> Guest5674, branch: Hammer
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[13:59] <Guest5674> thanks daviddcc. I don't know git that well, so back to finding out how to clone a particular branch
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[14:02] <Guest5674> like this: git clone -b hammer --recursive https://github.com/ceph/ceph.git
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[14:10] <Guest5674> or do I need --single-branch as well?
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[14:10] <daviddcc> Guest5674, i don't know :)
[14:11] <Guest5674> well, I just try without first then :-)
[14:12] <Guest5674> so, can I still use ceph-deploy to install the cluster after having installed ceph with 'make install' on the head node?
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[14:12] <alfredodeza> Guest5674: no
[14:12] <alfredodeza> ceph-deploy works with repositories
[14:13] <Guest5674> oh darn..
[14:13] <alfredodeza> if you have a repository then you can point ceph-deploy to a repository and install ceph.
[14:14] <Guest5674> yes, but it does not work for fedora 21, because there is only a repository for fc20. ceph-deploy insist looking in a path that does not exist.
[14:14] <alfredodeza> correct
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[14:14] <alfredodeza> if you have a repository with fc21 packages then you can point ceph-deploy to that
[14:14] <alfredodeza> see `ceph-deploy install --help`
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[14:18] <Guest5674> alfredodeza, on fedora 21 I try this: ceph-deploy install --repo-url http://ceph.com/rpm-hammer/fc20 novamaris
[14:19] <alfredodeza> that may or may not work
[14:19] <alfredodeza> not sure what incompatibilities there are between fc20 and fc21
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[14:20] <Guest5674> So I try to install fc20 packages on fc21. If that does not work, I will try the git approach.
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[14:21] <Guest5674> It fails unfortunately. ceph depends on libboost_system.so.1.54.0, but 1.55.0 is installed (fc21 is newer of course)...
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[14:24] <Guest5674> I will try a symlink for 1.54.0 to 1.55.0 as last resort.
[14:25] <Guest5674> I wish someone would just make a repo for fc21 though...
[14:26] <Guest5674> I will probably get ceph to work here, but after testing we want to run production and you can't have hacks like symlinks, or compiling the whole of ceph by hand in a production environment.
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[14:36] <alfredodeza> Guest5674: it would be easy to try one of our supported platforms
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[14:37] <alfredodeza> easier
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[14:40] <dmn> hi, to install ceph is it neccessary to have a dedicated machine for the admin node?
[14:41] <dmn> Would it be possible to have a node work as both an admin node and a ceph node?
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[14:42] <kefu_> dmn: i think you can even run a ceph cluster on a single machine, but not for production.
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[14:45] <dmn> kefu: Just trying to test it out. I have 2 servers which I can use but I read somewhere that minimum of 3 servers are required to run ceph.
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[14:46] <dmn> so was wondering if I could make do with only 2 servers that I have.
[14:46] <dschneller> Single host install is not possible out-of-the-box, because the crush map will need to edited. Otherwise ceph will complain that OSDs are on the same host, which would not cover the hsot as a failure domain.
[14:46] <dschneller> For development it is certainly possible, but you must be aware that you need to change the crush rules.
[14:47] * kefu_ is now known as kefu
[14:47] <SamYaple> dschneller: it will still work, it will just complain
[14:47] <SamYaple> youll never have a health cluster without editing the crush map
[14:48] <dmn> so would it work if I use one server as an admin node and a ceph node and the other server as a ceph node used for replication?
[14:48] <dschneller> Ok, but it might probably prevent you from writing data, unless you set min_size to 1.
[14:48] <SamYaple> dschneller: it doesnt
[14:49] <dschneller> Alright :) Learned something new then.
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[14:49] <SamYaple> *it didn't in emperor, firefly, hammer. i havent done it in giant
[14:51] <dmn> kefu, dschneller, SamYaple: would ceph work if I use one server as an admin node and a ceph node and the other server as a ceph node used for replication?
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[14:52] <SamYaple> dmn: ceph will *work* in any configuration you can think of if it can work on a single node. So yes, but i wouldn't call it production
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[14:53] <kefu> dmn: i think so. a minimum set of ceph cluster can be hosted on a single machine. you can run multiple instances of osd, mds in a single linux box.
[14:53] <kefu> yeah, agreed. =)
[14:54] <dmn> oh, okay. Thanks :)
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[15:01] <Guest5674> I get stuck in configure: configure: error: no suitable crypto library found
[15:01] <Guest5674> What library is it referring to?
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[15:06] <rkeene> dschneller, How's it going ?
[15:06] <Guest5674> I am guessing cryptopp-devel or nss-devel?
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[15:07] <dschneller> rkeene: Thanks for asking. It seems to be related to the snapshots we took last night. At least that's what I read from the code (with your analysis helping).
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[15:07] <dschneller> I amended the bug ticket if you are interested in the details. Basically we believed to have removed all test-snapshots from last night, but we forgot some.
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[15:08] <dschneller> Now - as you said - there seems to be some bug wrt locks not being set/released in the snapshot case.
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[15:10] <rkeene> dschneller, Has removing all the snapshots helped ?
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[15:11] <dschneller> rkeene: Well....
[15:12] <dschneller> When we last tried that (with firefly) the throttling for the snapshot removal was somehow broken. We removed a single snapshot from the RGW pools and the system went nuts removing the snapshots with all its might.
[15:13] <dschneller> Also: We are wary of trying it, because if the locking is broken, what else would go wrong if we started to delete snapshots.
[15:13] <dschneller> But, of course, that is the logical thing to consider.
[15:14] <dschneller> There exist older snapshots from the Firefly era, which for the last week did not seem to have caused any troubles.
[15:14] <dschneller> Seems it is the new ones created with hammer last night.
[15:14] <dschneller> Not even sure why it would matter that there is a new snapshot in regular operations. Isn't that something that is done once and then just "sits there" until we decide to either access it or remove it?
[15:15] <rkeene> Good to know as I am running Hammer in production now so I should look into this :-)
[15:15] <dschneller> Tell us about it...
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[15:16] <rkeene> I take hourly snapshots, but haven't seen this
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[15:17] <dschneller> How long do you keep them?
[15:17] <dschneller> And how big are the pools you take them on?
[15:18] <rkeene> I keep them on this side (they are mirrored via ceph send) for a week, and on the other side for longer
[15:18] <rkeene> The pools are tiny, a few TB
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[15:20] <dschneller> I see
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[15:22] <dschneller> erm... what do you mean with "ceph send", now that I read it again?
[15:23] <kefu> Guest5674: you might want to try out install-deps.sh
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[15:54] <rkeene> dschneller, We send the snapshots over the wire to a different Ceph cluster
[15:55] <rkeene> So if this entire cluster goes down, we can restore our point-in-time snapshots
[15:55] <dschneller> rkenne: Hehe. So far I got it :) How do you do that exactly? I googled for "ceph send" and did not come up with anything meaningful.
[15:55] <dschneller> That proposition sounds very likeable.
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[15:56] <rkeene> https://ceph.com/dev-notes/incremental-snapshots-with-rbd/
[15:56] <rkeene> It's export/export-diff in Ceph... I'm more used to ZFS :-)
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[15:57] <dschneller> Thanks. WIll study that.
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[15:58] <T1w> unfortunately it only works with rdb and not cephfs or object storage
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[15:59] <dschneller> Darn... That's what I feared.
[16:00] <dschneller> The absolute bulk of our data is in object storage.
[16:00] <srk> hi, anyone of aware of performance benchmarking data with ceph and openstack w.r.t. cinder volume operations
[16:00] <rkeene> Ah, we only use it for RBD (with QEMU, not even the kernel RBD client)
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[16:03] <dschneller> How do you make sure they are consistent? Have you tried bringing an instance up again on the other side, based on such an image? I imagine e. g. some kind of file or database server with lots of IO in the middle of which you snapshot.
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[16:51] <srk> hi, anyone of aware of performance benchmarking data with ceph and openstack w.r.t. cinder volume operations
[16:51] <kblin> hi folks
[16:51] <kblin> I'm trying to install ceph on debian jessie, and I can't find a ceph-deploy script there
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[16:52] <kblin> but there are no jessie packages on ceph's own repository
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[16:53] <kblin> I'd prefer not having to compile ceph myself, because that usually leads to loads of extra fun, but I guess that's my only option if I want to follow the docs?
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[17:27] <Guest5674> kblin, I'm doing that for fedora 21. There are build scripts for building rpm and deb files, it turns out.
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[18:06] <dschneller> Actually compiling the current release is very easy. clone the branch onto a build machine, call install-deps (or similar) and then make-debs.
[18:07] <dschneller> Don't forget to clone recursively, otherwise the submodules will not be there and you get strange errors about missing stuff during compilation.
[18:07] <dschneller> Guess how I know about that ;)
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[18:11] * rkeene always builds from release tarballs
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[18:21] <dschneller> rkeene: Coward ;)
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[18:40] <rkeene> :-)
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[21:32] <ShaunR> If a OSD is a single drive whats the point of having a seperate journal partition?
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[21:34] <gleam> no filesystem overhead for the journal
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[21:40] <ShaunR> When using ceph-deploy it looks like it creates two partitions of the same type... naming one a journal
[21:40] <ShaunR> are they not?
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[21:47] <gleam> yes, it creates two partitions but it only puts a filesystem on one of them
[21:51] <m0zes> a seperate journal partition on the same disk *can* be beneficial for spinning disks due to head travel distances. with the journal (almost) constantly being written to, it makes sense to make sure the disk doesn't spend any more time seeking than it has to.
[21:51] <ShaunR> How can i completely remove an OSD so that i can run ceph-deploy osd prepare on it again and for it to not increment the id
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[21:52] <ShaunR> right now it wants to create the next osd id as 6, but i dont have any osd's... i'd rather it start from 0 again
[21:53] <gleam> if the # isn't in your crush map it will reuse the lowest number i believe
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[23:35] <srk> m0zes: are you aware of any performance bench marking data for openstack cinder volume operations with rbd ?
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[23:53] <jkt> hi there, I'm playing with Hammer on centos7 using the openstack's stackforge/puppet-ceph, and I'm testing a very dumb config with just a single mon and no OSDs
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[23:53] <jkt> why would `ceph status` hang, and if I use some short --connect-timeout, say that it cannot connect?
[23:53] <jkt> I've already checked my firewall, everything is running over lo anyway
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[23:54] <jkt> trying to add some OSDs on the same host appears to hang, too
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[23:57] <jkt> ah, with --admin-socket I now know that I've got a rank of -1 for some reason
[23:59] <ShaunR> i deployed a very small ceph setup, it consists of 3 servers each running as a mon, with 1 osd each. When creating a pool what would be the correct pg_num and pgp_num sizes
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These logs were automatically created by CephLogBot on irc.oftc.net using the Java IRC LogBot.