#ceph IRC Log

Index

IRC Log for 2013-11-29

Timestamps are in GMT/BST.

[0:00] * mschiff_ (~mschiff@85.182.236.82) Quit (Quit: http://quassel-irc.org - Chat comfortably. Anywhere.)
[0:03] * wschulze (~wschulze@cpe-72-229-37-201.nyc.res.rr.com) has joined #ceph
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[0:06] * cofol1986 (~xwrj@120.35.11.138) Quit (Ping timeout: 480 seconds)
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[0:07] * xdeller_ (~xdeller@95-31-29-125.broadband.corbina.ru) Quit ()
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[0:54] * yanzheng (~zhyan@jfdmzpr02-ext.jf.intel.com) has joined #ceph
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[0:58] * ponyofdeath (~vladi@cpe-75-80-165-117.san.res.rr.com) Quit (Quit: leaving)
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[1:03] * cofol1986 (~xwrj@120.35.11.138) Quit (Read error: Connection reset by peer)
[1:04] * vata (~vata@2607:fad8:4:6:20a9:584d:4f08:85fe) Quit (Quit: Leaving.)
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[1:07] * darkfaded (~floh@88.79.251.60) Quit (Read error: Connection reset by peer)
[1:11] * sarob (~sarob@c-50-161-65-119.hsd1.ca.comcast.net) Quit (Ping timeout: 480 seconds)
[1:14] * Pedras (~Adium@c-67-188-26-20.hsd1.ca.comcast.net) Quit (Quit: Leaving.)
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[1:18] * yanzheng (~zhyan@jfdmzpr02-ext.jf.intel.com) Quit (Remote host closed the connection)
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[1:26] * ChanServ sets mode +o scuttlemonkey
[1:46] * jesus (~jesus@emp048-51.eduroam.uu.se) Quit (Ping timeout: 480 seconds)
[1:49] * gillesMo (~gillesMo@00012912.user.oftc.net) Quit (Quit: Konversation terminated!)
[1:49] * nwat (~textual@c-50-131-197-174.hsd1.ca.comcast.net) Quit (Quit: My MacBook has gone to sleep. ZZZzzz…)
[1:53] * cofol1986 (~xwrj@120.35.11.138) Quit (Read error: Connection reset by peer)
[1:54] * hufman_ (~hufman@CPE-72-128-68-147.wi.res.rr.com) has joined #ceph
[1:55] <hufman_> heh, rebooting the router does that, oops
[1:56] * hufman (~hufman@CPE-72-128-68-147.wi.res.rr.com) Quit (Ping timeout: 480 seconds)
[1:56] * hufman_ is now known as hufman
[1:58] * hufman (~hufman@CPE-72-128-68-147.wi.res.rr.com) Quit ()
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[2:04] * LeaChim (~LeaChim@host86-162-2-255.range86-162.btcentralplus.com) Quit (Ping timeout: 480 seconds)
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[2:08] * yanzheng (~zhyan@jfdmzpr06-ext.jf.intel.com) has joined #ceph
[2:09] * sjm (~sjm@pool-96-234-124-66.nwrknj.fios.verizon.net) has left #ceph
[2:11] * sarob (~sarob@c-50-161-65-119.hsd1.ca.comcast.net) Quit (Ping timeout: 480 seconds)
[2:14] * Pedras (~Adium@c-67-188-26-20.hsd1.ca.comcast.net) has joined #ceph
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[2:22] * Pedras (~Adium@c-67-188-26-20.hsd1.ca.comcast.net) Quit (Ping timeout: 480 seconds)
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[2:40] * joao (~joao@a79-168-11-205.cpe.netcabo.pt) Quit (Ping timeout: 480 seconds)
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[2:46] * jesus (~jesus@emp048-51.eduroam.uu.se) Quit (Ping timeout: 480 seconds)
[2:46] * mwarwick (~mwarwick@2407:7800:400:107f:6e88:14ff:fe48:57e4) Quit (Read error: No route to host)
[2:53] * joao (~joao@a79-168-11-205.cpe.netcabo.pt) has joined #ceph
[2:53] * ChanServ sets mode +o joao
[2:54] * nwat (~textual@c-50-131-197-174.hsd1.ca.comcast.net) Quit (Quit: My MacBook has gone to sleep. ZZZzzz…)
[2:54] * caleb_ (uid16207@id-16207.charlton.irccloud.com) Quit (Quit: Connection closed for inactivity)
[2:54] * jesus (~jesus@emp048-51.eduroam.uu.se) has joined #ceph
[2:55] <pmatulis> does it matter if my disks are small (< 250 GB) and i dedicate each to an OSD? i'm thinking of using LVM to combine them into a bigger one. comments?
[2:56] * madkiss (~madkiss@2001:6f8:12c3:f00f:6074:f2fc:d766:d5dc) Quit (Read error: Network is unreachable)
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[3:11] * joao (~joao@a79-168-11-205.cpe.netcabo.pt) Quit (Ping timeout: 480 seconds)
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[3:20] * ChanServ sets mode +o joao
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[3:46] * KevinPerks1 (~Adium@97.68.216.74) Quit (Read error: Connection reset by peer)
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[11:41] <machete> hi
[11:41] <machete> am I doing something wrong or is ceph-deploy not exactly production ready with multiple clusters ?
[11:41] <machete> I have yet to locate the keyrings after creating a new cluster on existing monitors
[11:43] <machete> I had this problem before where it would just hang in ps when hosts didn't match with `hostname` but now i don't even see an attempt to generate them
[11:45] * kasimon1 (~user@2a02:2450:dd1f:0:a1d7:5a4e:5eb5:2fbe) has joined #ceph
[11:46] <kasimon1> Hi ceph guys! I've read a lot on ceph.com but one thing isn't clear to me: Which parts of ceph should I put behind a loadbalancer?
[11:47] <kasimon1> I mean every mon has it's own IP, what do I use as 'service' IP to talk to the ceph cluster?
[11:48] <andreask> kasimon1: a loadbalancer makes sense for multiple rados gateways
[11:48] <kasimon1> andreask: But if I want to mount a ceph filesystem, I have to specify a monitor ip. what if that monitor goes down?
[11:49] <kasimon1> andreask: maybe better say ha failover ip than loadbalancer. I'm not concerned with the load.
[11:50] <andreask> kasimon1: you can add all your mon addresses to the mount command, if the first fails the next mon is tried
[11:50] <kasimon1> So I have to maintain the list of monitors on every client?
[11:51] <andreask> one possibility, yes
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[11:51] <kasimon1> andreask: or use dns round robin.
[11:51] <zrlpll> hi
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[11:52] <andreask> kasimon1: hmm ... well, if the one that is choosen via dns is currently down ....
[11:52] <kasimon1> andreask: ah, i just found http://blog.widodh.nl/2013/04/redundant-ceph-monitors-with-round-robin-dns/
[11:56] <zrlpll> How can I create a client.admin user without disabling cephx? (I am not using ceph-deploy, working with puppet scripts)
[11:57] <zrlpll> if I just write client.admin key to /etc/ceph/keyring in the monitor node (using the output from ceph-authtool) no admin commands work from within the monitor
[11:57] <andreask> kasimon1: if you have no dns caching on os level enabled it should do fine, yes
[11:58] <zrlpll> If I however disable cephx, run ceph auth get-or-create to generate the keyring, then enable cephx, everything works
[12:00] <kasimon1> andreask: good to keep that in mind. Thanks so far!
[12:01] <zrlpll> so I guess the question is, what is the difference between running ceph-authtool --create-keyring /etc/ceph/keyring -n client.admin --gen-key and doing it with ceph auth get-or-create ?
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[12:45] <R0adRunner> Hello all. It is possible to have bot brtfs and xfs osds in one cluster?
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[13:00] <xdeller> R0adRunner: of course
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[13:16] <R0adRunner> At present, all drives are XSF FS. So there is no problem part of them to be removed and formatted in brtfs and added again in cluster?
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[14:19] <machete> I seem to have found the root of the issue (well, at least part of it)
[14:19] <machete> https://github.com/ceph/ceph-deploy/blob/master/ceph_deploy/mon.py#L39
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[14:19] <machete> the second monitor daemon fails to start as the cluster name is not interpreted when generating lock/pid/socket files
[14:19] <machete> it only uses hostname and fails seeing there already is a monitor running on that server
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[14:25] <machete> any chance this can be fixed soon without seding locally ?
[14:25] <machete> i don't see any bug tracking on your github
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[14:41] <andreask> machete: I had an issue where only the mon initial members where defined but the ips used by the mons did not resolve to that ... had to specify "mon addr" too
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[19:58] <pmatulis> does it matter if my disks are small (< 250 GB) and i dedicate each to an OSD (to get 4)? i'm thinking of using LVM to combine them into a bigger one. comments?
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[20:00] <pmatulis> i.e is there a point where the space added to a cluster is not worth the number of OSD processes?
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[20:02] <Sysadmin88> pmatulis, define not worth the OSD process? you short of RAM or CPU or something?
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[20:04] <pmatulis> Sysadmin88: no, it's a hypothetical question. taken to the extreme, say i have 10 disks of 100GB each. is it an efficient use of resources to have 10 OSD processes to gain 1TB of space or is it more efficient to have a single process?
[20:04] <pmatulis> by combining those disks using LVM
[20:05] <Sysadmin88> your doubling your space and doubling your resource usage... seems not too bad
[20:05] <Sysadmin88> or are you saying something like have those 10 drives on Raid and then one OSD?
[20:06] <pmatulis> either RAID0 or LVM
[20:06] <pmatulis> yes, i said a single process
[20:06] <Sysadmin88> is your raid self healing and self balancing :)
[20:07] <guppy> pmatulis: personally, I'd go with 10 OSDs in that case
[20:07] <pmatulis> i'm not concerned about those aspects right now
[20:07] <darkfader> pmatulis: keep in mind the volume of data to backfill if you replace an osd
[20:07] <darkfader> vs. the interface bandwidth
[20:07] <pmatulis> yeah, guys, i'm not worried about those things at this point
[20:07] <pmatulis> the crux of my question is how expensive is it to run a single OSD process
[20:08] <guppy> my guess is the difference between one larger OSD and a bunch of smaller OSDs is minimal in terms of resource usage
[20:09] <darkfader> with a few cores to spare i'd not be surprised if the 10 (or 5, w/small raid0) OSD version is faster in iops
[20:09] <guppy> I'd personally avoid lvm/raid just to avoid adding extra layers -- ceph is built to handle lots of OSDs
[20:09] <guppy> why complicate it?
[20:09] <darkfader> ++
[20:10] <pmatulis> yeah, my question is not looking at those things
[20:11] <pmatulis> the question essentially is: is the resource expense (memory, cpu) of running an OSD process proportional to the amount of space being managed by the OSD process?
[20:11] <guppy> pmatulis: that's part of the design though
[20:11] <guppy> you can't just ignore it
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[20:11] <guppy> pmatulis: I believe it is
[20:12] <guppy> http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/003301.html
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[20:13] <pmatulis> guppy: thx, bookmarked
[20:13] <guppy> http://www.spinics.net/lists/ceph-devel/msg02368.html
[20:14] <guppy> 1 OSD per drive makes a lot of sense when you are talking about disk failures
[20:15] <pmatulis> of course
[20:15] <guppy> and things like that are far more important to me than the extra cpu/ram that'll be used by running N osds ... which should be pretty minimal
[20:15] <pmatulis> guppy: i know
[20:16] <guppy> is the osd parallelized at all?
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[20:18] <Sysadmin88> pmatulis, you cant just say " i dont care about the self replicating and self healing" when your picking a product that does exactly those two things.
[20:18] <pmatulis> guys, i'm just trying to understand something specific
[20:18] <guppy> I think he cares about it, just not in regards to his question
[20:18] <Sysadmin88> if one drive breaks in your massive raid 0... you lose 1tb of data and that takes a long time to fix over gigabit ethernet
[20:18] <pmatulis> yes, i know
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[20:19] <guppy> pmatulis: this is a simple thing to test
[20:19] <guppy> set up 10 osds and compare the cpu/ram to a single osd using the same amount of space
[20:19] <Sysadmin88> use top to see how much RAM/CPU your OSD process is using for various partition sizes?
[20:19] <guppy> my guess is, minimal difference
[20:20] <Sysadmin88> and if 10 OSDs are crippling your hardware... you either deal with less performance or get bigger hardware :)
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[20:21] <Sysadmin88> in order to have 10 HDDs on a device your going to need half decent hardware anyway. most low end motherboards only come with 4
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