#ceph IRC Log

Index

IRC Log for 2015-12-17

Timestamps are in GMT/BST.

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[0:33] <rdleblanc> Not specifically Ceph related, but I'm trying to clean up my pull request. Should I do 'git rebase' followed by 'git -i rebase', then multiple 'git -i add' to break each change into seperate commits. Then create a new branch and cherry-pick those commits?
[0:33] <rdleblanc> Sorry if I sound like a noob.
[0:37] <joshd> rdleblanc: if you're new to rebasing, I'd create a new branch to start with (once you're done you can reset your original branch if you like)
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[0:39] <rdleblanc> joshd: a branch off the current branch? Is the general procedure along the right lines?
[0:39] <rdleblanc> I can't seem to get the right terms into Google.
[0:40] <joshd> rdleblanc: yes, a copy of the current branch (e.g. 'git checkout -b new-branch' while on your current branch)
[0:40] <joshd> rdleblanc: if you've already got a bunch of commits, and you want to edit them (maybe splitting some up), git rebase -i is what you want to use
[0:41] <rdleblanc> I have a ton of commits (I like saving often). I need to break them into organized commits so they are easier to review.
[0:42] <joshd> the general process is right, just no cherrypicking at the end.
[0:42] <rdleblanc> I need to spit some changes from a single file into different commits which is where I think 'git -i add' comes in.
[0:42] <joshd> yeah, exactly
[0:43] <rdleblanc> joshd: ok, I'll start staggering that direction. Thanks.
[0:43] <joshd> no need to cherry-pick at the end, but otherwise your process is right
[0:44] <joshd> if the commits need a ton of restructuring, sometimes it's easier to 'git reset --mixed', then create entirely new commits with git add -i
[0:45] <rdleblanc> joshd: I'll look into git reset --mixed too.
[0:47] <rdleblanc> joshd: man page says that --mixed is the default, does that sound right?
[0:48] <joshd> rdleblanc: I don't remember, I always specify the type explicitly
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[3:10] <ptx0> TheSov: do you think it would be okay to use a single-node Ceph setup (with quorum disabled)?
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[3:28] <m0zes> good idea? no. would it work? probably. would it be performant? probably not.
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[3:37] <ptx0> m0zes: would it be less performant than the single node without Ceph on top of the storage?
[3:39] <m0zes> (almost) guaranteed, due to the double write requirements of the backend (journal + data)
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[5:15] <jidar> looking at this, can I up the pg's per OSD, getting the same error as here: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-July/041390.html
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[7:17] <adun153> Where can I get Hammer binaries/packages for Ubuntu 14.04.3? I just realized that trying ceph-deploy gives me Firefly binaries.
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[8:11] <Be-El> hi
[8:14] <liiwi> good morning
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[9:09] <- *madkiss1* s1
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[9:29] <skoude> noob question, but if I set the pool size = 3 and I have 4 ceph servers in the cluster, does it mean that it will write data three times. One time for three different servers?
[9:31] <skoude> And in crusmap rules I have min_size = 2, so the cluster should still work if two of the nodes goes down? Did I undestand it correctly?
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[9:38] <IcePic> yes to both
[9:39] <IcePic> min_size is the limit when it starts prioritizing replication to serving data. If you drop to 2 or fewer copies, it will try to make new copies from the existing ones to make it 3 again, as best it can
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[9:40] <Be-El> skoude: it depends on which hosts go down. min_size means that that number of osd have to be available to allow I/O
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[9:41] <Be-El> skoude: with 3 replicates on 4 hosts you have a 50:50 chance that I/O is blocked since two replicates of three are not available
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[9:43] <Be-El> IcePic: min_size is not related to replication. it just defines how many replicate have to be present to allow I/O
[9:43] <Be-El> IcePic: every missing/degraded/remapped PG triggers backfilling
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[9:46] <IcePic> I wrote it a bit short, but meant "when it stops serving clients in order to have time to copy data to yet again reach 3 copies as ordered"
[9:47] <IcePic> its interesting to know if "keeping the data" or "serving the data 24/7" is the actual demand here, since even with one copy retained, the data would be available (but not safe, nor redundant), but as you said, ceph will prevent you from doing stuff with the data until it has more copies.
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[9:48] <Be-El> IcePic: that's why you can choose between accessibility (min_size=1) and safety (min_size > 1)
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[9:51] <IcePic> yes, just wanted to hear what skoude really was after since you actually have a choice.
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[9:54] <skoude> I was after the availability :) Thanks for the answers I get it now..
[9:58] <skoude> and one thing.. Do i need to keep RBD and metadata pools? Are they for ceph internal use?
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[10:00] <The1w> depends on what you want to use
[10:00] <The1w> the rbd pool is the default pool created when the cluster is created
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[10:01] <The1w> the metadata pool is for cephfs usage (afair)
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[10:01] <skoude> The1w: I created my own pools for openstck so basically I could then delete the rbd..
[10:02] <The1w> I've got no idea about openstack requirements - looking at the PG calculator on there are a lot of pools in play
[10:02] <The1w> on http://ceph.com/pgcalc/ even
[10:02] <The1w> also depends if it's just openstack or openstack with RGW
[10:03] <The1w> I've got no clue in regards to openstack, so I really can't say
[10:03] <skoude> Here is a snippet of ceph osd dump: http://pastebin.com/PnGNeNdn
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[10:04] <skoude> is there anything that looks bad or needs fixin?
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[10:44] <boolman> anyone got experience with laggy mds servers?
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[11:21] <Heebie> Does anyone know if it's possible to move an existing IPv4-based CEPH system over to IPv6? I'm thinking yes by moving OSD's, MONs to IPv6 servers over time.
[11:23] <The1w> it is possible, but you need to take care when chaning the MON ips
[11:23] <The1w> google a bit - there has been some talks on the mailinglist with regards to doing that
[11:23] <Heebie> I was thinking just adding new MON's to the group, then deprecating the ipv4 ones.
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[11:24] <The1w> as long as you do not risk split brain and end up with 2 sets of MONs that think they both hold quorum
[11:24] <The1w> .. or loose quorum
[11:24] <The1w> there are several cevats
[11:24] <The1w> caveats even
[11:25] <Heebie> I'm sure. Is there a way to move to separate cluster/client networks if you only have a single network to begin with?
[11:25] <The1w> (I can never remember the correct spelling of that word..)
[11:25] <The1w> yes..
[11:26] <The1w> add interfaces, ensure connectivity all across and then take out each daemon one at a time restarting them with an updated ceph.conf with the new cluster network added
[11:26] <The1w> oh, and set noout
[11:27] <The1w> and still.. google a bit - a common question and there are several dangers
[11:27] <Heebie> Cool. I'm still in dev/testing stage on IPv4, so I can play & check it out as well.
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[15:25] <TiCPU> I'm having an active+clean+inconsistent PG, and I'm trying to repair / deep-scrub it, however, I just found out that any "ceph pg <deep-scrub|repair>" command is being completely ignored by the cluster, I tried restarting each affected OSD and electing a new monitor without success. Any idea? Automatic deep-scrub are working too.
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[15:27] <TiCPU> Oh, and this is on Firefly 0.80.10
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[15:32] <tenshi> hi everyone.
[15:34] <tenshi> When we meet Sage at Tokyo, we were talking about a ceph backup solution, I came with the incremental snapshot exchange between two ceph infrastructure; but Sage told us that doing snapshot of a whole pool is not a good idea; so we went doing snapshot of each rbd volume. My question is pretty simple, why pool snapshots would be not recommended ?
[15:35] <sage> tenshi: pool snapshots and rbd snapshots are mutually exclusive.. you can't do both in the same pool.
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[15:36] <sage> tenshi: also, the pool-level object enumeration support for a pool snapshot isn't robust
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[15:45] <tenshi> Hy sage
[15:45] <tenshi> nice to speak to you again ;) so that is why you did not recommend pool snapshot right
[15:45] <tenshi> ?
[15:45] <sage> yeah
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[15:46] <sage> the pool level snaps have pretty limited use-cases... really just for users doing something with librados directly
[15:47] <TheSov> are rbd strips always 4 meg?
[15:47] <TheSov> or can those be tuned
[15:48] <sage> you can set set it when teh image is created with teh --order argument to rbd create. 4mb is just the default
[15:51] <tenshi> sage, thank you as always effecient answers ;)
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[16:18] <Aeso> I'm looking to deploy an all-flash ceph cluster as a backend for VMs running on Hyper-V hosts. Is there any best practices or pre-existing designs that have been tested/proven?
[16:19] <Aeso> I've got reasonable performance from the ceph cluster already, I'm just trying to figure out how to expose the storage in a redundant fashion since Windows (afaik) can't talk to Ceph natively.
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[16:22] <Aeso> I thought maybe CephFS -> SMB + CTDB would work out but my initial testing showed CephFS was far too slow for my usual workload. (for a 4k randrw workload)
[16:23] <Aeso> We've got 40gbps IB links between all of the machines, so my current working theory is GPFS on RBD -> SMB 3.1 (multichannel, direct, etc)
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[16:29] <rkeene> Aeso, GPFS is expensive
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[16:31] <TheSov> sage is the best!
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[16:31] <rkeene> Hmm ?
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[16:33] <Heebie> new weird error. Trying to create a pool (ceph osd pool create ProxMoxTest 1024 1024 replicated 7200-only) I get this: "Error ENOMEM: unable to fork(): (12) Cannot allocate memory" I have a feeling I must be doing something stupid, because I've not had an issue before.
[16:33] <Heebie> (and the machine I'm running the command on has 148GB of RAM, with only about 16 of it in-use)
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[16:35] <Aeso> rkeene, is there an alternative option, then? I suppose I could try to do some kind of iSCSI active/passive failover via pacemaker.
[16:35] <TheSov> rkeene, im testing rbd's for speed, and they go somewhat slow. so i noticed the object size is 4M i wanted it at 4k
[16:37] <magicrobotmonkey> using rbd is there a way to put `id` or `name` in a conf file so I don't have to specify it on the command?
[16:38] <magicrobotmonkey> Heebie: check your ulimits
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[16:40] <rkeene> Aeso, I'm not sure, I don't use Windows for anything so I am unaware of its limitations
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[16:42] <Aeso> I was afraid you'd say that, heh. Feels a bit like I'm trying to fit a square peg into a round hole.
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[16:42] <rkeene> You could just stop using Windows... :-D
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[16:43] <Aeso> rkeene, with Microsoft changing their virtualization licensing next year I might be able to convince the bossman. :)
[16:46] <IcePic> are they going to do a VMWare and play games with licensing?
[16:47] <Aeso> The way I understand it (and this is a little out of my domain so I apologize for any incorrectness) is that they're moving to per-core licensing.
[16:48] <Heebie> magicrobotmonkey: same thing happens for the root user or the ceph user. (and didn't happen with any other pool creation I've done) but I'll take a look.
[16:48] <IcePic> VMware "tried" to move from per-core to per-gig-ram, and since everyone seemed to have optimized for few-cores-and-tons-of-ram they probably hoped to make some serious moneys from it. I think that is that drove most hosting companies and smaller shops to kvm. =)
[16:49] <Aeso> Looks like both windows server standard and datacenter are per-core + CAL licensing now. :x
[16:50] <magicrobotmonkey> ouch
[16:51] <rkeene> Well, we sell a pre-integrated Ceph+KVM+OpenNebula product...
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[16:59] <lookcrabs> ?
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[17:05] <nils_> Aeso, maybe use RBD devices and export them using iSER?
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[17:06] <nils_> afaik windows has a driver for that
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[17:07] <rkeene> lookcrabs, Me ?
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[17:09] <Heebie> Apparently, while a MON is not responding correctly, creating pools doesn't work very well.
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[17:10] <Heebie> One of my co-workers knocked a cable loose! :(
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[17:14] <Aeso> nils_, is there any way to make iSER highly-available? Prior to Ceph we'd been deploying storage via ZFS + iSCSI, but one of the selling points for Ceph was moving the failure domain beyond a single machine.
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[17:16] <nils_> Aeso, yeah that would be problematic since you still need some sort of machine that exposes the devices via iSER, although I imagine there is a way using multipath - don't know if windows supports that.
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[17:24] <TheSov> im in a very heated debate on reddit between a bunch of EMC employees and me
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[17:26] <lookcrabs> rkeene: yes. That sounds kind of neato to look into.
[17:27] <lookcrabs> http://vignette2.wikia.nocookie.net/powerlisting/images/a/a3/Neo.gif/revision/latest?cb=20131214115047
[17:27] <nils_> To the keyboards! Someone is wrong on the internet!
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[17:31] <rkeene> lookcrabs, I'm not sure where on our website we market it... But I can give you a demo !
[17:32] <rkeene> I'mnot sure if they change the website around or if it's just not obvious, I found the link one time... Our website isn't even "big" (there aren't a lot of pages)
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[17:38] <darkfaded> nils_: windows supports multipath since 2003, and it works reasonably since 2008
[17:38] <darkfaded> should also be ok with smb direct, i haven't ever tried that or iSER on windows so far
[17:39] <darkfaded> mostly because i read into setting it up on linux and got frustrated ;)
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[17:39] <nils_> not my area of expertise, I use Windows strictly for gaming
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[20:50] <Kupo1> There a way to tell ceph-deploy what ssh port to use?
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[20:52] <rkeene> Kupo1, In general I'd use an ~/.ssh/config file to tell OpenSSH how to reach nodes by name
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[21:01] <The1_> it's possible via .ssh/config where you can add various information
[21:01] <The1_> both usernames, port, hostnames etc etc
[21:02] <rkeene> And proxy information -- I ssh to hosts I can't make TCP connections to all the time
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[21:09] <alfredodeza> Kupo1: not directly, but like others have said, .ssh/config is your friend
[21:09] <lookcrabs> quick question as I am not sure. I know the recommended rule of thumb is $(osds) * 50 ..100PGs / 3 but this seems to be strongly geared towards replication . Is there a similar equation for EC pools or do I just do the same thing? What would the replication be for EC considering I have a 5m4k type EC profile?
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[21:14] <snakamoto> lookcrabs: have you check out http://ceph.com/pgcalc/ ?
[21:14] <snakamoto> "For Erasure Coded Pools, select a 'Size' value equal to the sum of k + m"
[21:14] <lookcrabs> ah thanks. That's what I thought but I wasn't sure. i'm dumb
[21:14] <lookcrabs> thanks snakamoto !!!
[21:15] <lookcrabs> I did just check the pgcalc but I guess I missed that :P
[21:20] <[arx]> anyone have experience with using openstack/puppet-ceph to provision a cluster? i can't get it to setup a single mon server up correctly. it hangs on the type 'ceph-injectkey-client.admin'.
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[21:52] <snakamoto> [arx]: I have not used it, but does this file exist? /etc/ceph/ceph.client.admin.keyring
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[22:07] <tomc> Is there an update on when ceph-post-file might work again?
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[22:12] <rkeene> lookcrabs, Hey that's like what we do (except our system is probably a bit more fancy than most types of things)
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[22:39] <[arx]> snakamoto: it does exist, but at that point i still can't do: ceph -s on the system
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[22:52] <snakamoto> [arx]: that line is trying to create the client.admin user, which would be what you use to run ceph -s
[22:52] <snakamoto> maybe try to run that command by hand
[22:52] <snakamoto> 'ceph auth add client.admin --in-file=/etc/ceph/ceph.client.admin.keyring'
[22:58] <snakamoto> has anyone here replaced a failed SSD journal drive on a live server?
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[23:04] <[arx]> snakamoto: i've tried, but the command never returns, any ceph command i try just hangs.
[23:08] <Superdawg> If I need to shut down a ceph cluster what is the appropriate order? Monitors then Metadata then OSDs? I would then assume the reverse to bring it back up. I'm having difficulties finding this info in the docs.
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[23:10] <Kingrat> Superdawg, ive always made sure to shut down any clients using it first, then set noout, i.e. with ceph osd set noout, and then shutdown order isnt too critical, i think usually my osds go down first before the monitors are shut down
[23:15] <Superdawg> Kingrat: Thanks. I've got a test cluster that I'm doing some work with that has some potential downtime needed in the near future. I don't want to have to redo any work if I don't have to.
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