#ceph IRC Log

Index

IRC Log for 2015-12-15

Timestamps are in GMT/BST.

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[0:36] <kfox1111> any reason a :<port>:<port> duplicate port number would show up in a url while uploading multiple files?
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[1:34] <ging> can anyone tell me, if a single osd reachest it's full ratio, does that stop all writes or just writes to that osd?
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[1:57] <doppelgrau> ging: IIRC only to that OSD, but in the rbd-usecase that means more or less a complete halt since all PGs on that OSD block IO
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[1:59] <ging> doppelgrau: ah so it's only that one osd, but it's reads and writes?
[2:00] <doppelgrau> ging: should be all writes to any PG on that osd
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[2:03] <ging> so say in a cluster with 12 osds on 3 mons, and 1 osd became full because the crush settings were wrong, the cluster would still work without a huge affect on performance?
[2:04] <doppelgrau> ging: no, all PGs on that osd will block, with size=3 that means 1/4s of the PGs
[2:04] <doppelgrau> so huge impact
[2:05] <doppelgrau> (with rbd it will mean total outage)
[2:06] <ging> ah
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[2:08] <ging> it just seems a bit weird to me that it is like that
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[2:08] <ging> it can handle a whole rack going down, but not a single disk getting full
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[2:09] <doppelgrau> ging: simple, the ???failure model??? is working or offline
[2:09] <doppelgrau> ging: a full disk is something between, so it blocks IO
[2:10] <doppelgrau> ging: but ceph will warn you (by default) before the disk get that full
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[2:11] <doppelgrau> ging: else there could be inconsistent states, and ceph tries to ensure consistency :)
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[2:15] <ging> how would it get into an onconsistent state? i'm just struggling to understand why it can't just simply mark an osd as full, then just read from it not write to it
[2:16] <doppelgrau> reads should work
[2:16] <doppelgrau> but writes won???t work
[2:16] <doppelgrau> and if you use rbd you nearly allways get some wirtes (atime updates or something like that ???)
[2:17] <ging> ok i think i get it
[2:18] <ging> i was thinking it could just write to the other copy of the data, but then it becomes inconsitant
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[2:21] <ging> so it blocks writes to all PGs which are on that osd, even though the same PG can be on other OSDs ?
[2:22] <doppelgrau> IIRC, yes
[2:22] <ging> yeah it is starting to make sense now
[2:24] <doppelgrau> ging: since I use the night for some maintenance and often have simply to wait for ceph to get again to HEALTH_OK, you can ask more question, I try to answer :D
[2:25] <ging> well thanks, i think i am out of questions for now, but you may see me again at some stage
[2:25] <ging> i've been tasked with looking after a ceph cluster someone else built
[2:26] <ging> a few days ago one of the osd filled up and all hell broke lose
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[2:27] <ging> i spent the weekend getting it back to normal
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[2:27] <ging> but couldn't quite get my head around how it went so wrong from a single full osd
[2:28] <doppelgrau> ging: with some basisc monitoring ???mon osd nearfull ratio??? results in an early warning, and if the shit hits the fan, you might increase ???mon osd full ratio??? if it isn???t maxed out yet to get a few moments to breathe and get the system working while adding disks or something like that
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[2:44] <ging> doppelgrau: it is monitored, unforuntatly no i wasn't around an no one else payed enough attention to the warnings, i had a big copy going, i had left a note saying to keep an eye on it, but it should be fine as there is plenty of capacity
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[2:45] <ging> unforuntatly it filled up one rather more quickly than the others
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[2:45] <doppelgrau> huge imbalance?
[2:45] <doppelgrau> how many PGs do you have? (and size and OSD-Number)
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[2:47] <ging> 320pgs 12 osds with about 1TB each
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[2:48] <ging> on 3 machines
[2:48] <doppelgrau> 320 PGs in one pool?
[2:48] <ging> yeah
[2:48] <doppelgrau> size=2 or size=3?
[2:48] <ging> size=2 i think
[2:49] <ging> that is where there are 2 copies of everything ?
[2:49] <doppelgrau> you might consider increasing pg_num to 1024
[2:49] <doppelgrau> yes
[2:49] <doppelgrau> power of two is recommended for a bit more even distribution and 100-300 (depending on the planed growth) PGs per OSD
[2:50] <doppelgrau> 12*100/2 => 600, next power of two 1024
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[2:50] <ging> what affect would increasing the pg_num on an active cluster have? i'm guessing an absolutely massive rebalance
[2:50] <doppelgrau> right
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[2:52] <ging> i think that might have to wait a little while but i will bare it in mind, it needs updating, it's running ceph 0.61.9
[2:52] <ging> on an unsupported version of ubuntu
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[2:56] <doppelgrau> I have to admit, started with 0.8x and currently using 0.9x
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[2:58] <ging> how do you go about upgrading? i take it that it's a full down time afair? or is there a seemless path?
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[2:59] <doppelgrau> there is usually a seamless path (firth mon, then mds/OSD)
[2:59] <doppelgrau> but only tested with specific versions IIRC
[3:00] <doppelgrau> so no direct path to 0.9x AFIK
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[3:05] <Nats__> the supported route is to upgrade through each stable version
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[4:31] <kfox1111> any idea why a giant radosgw might not behave with tempurl's as documented?
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[6:04] <ging> is there a way to get max backfills on a cluster basis or mon basis? i can set it for an osd with ceph osd tell <osd> injectargs '--osd-max-backfills n' but i wonder if there is a way to do it all at once
[6:06] <ging> also is there a way to print the running config ?
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[6:12] <doppelgrau> ceph osd tell <osd>.* ?!
[6:13] <ging> that doesn't seem to work for me
[6:13] <ging> i get strict_strtoll: expected integer, got: '*'
[6:14] <ging> maybe just because i'm running an older version or the type of shell i use
[6:14] * doppelgrau uses e.g ceph tell osd.* heap release
[6:14] <doppelgrau> might be the reason
[6:17] <ging> what is the best way of bringing an osd back in after a failure, i've removed it, but not marked it lost, the cluster has full rebalanced, the hardware seems to be ok just a trashed file system
[6:18] <ging> i'm not sure if i should just add it back in with the same osd number, or create a new one
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[6:19] <doppelgrau> I remove the osd completly (remove from crush-map, remove auth, remove osd) and then add a new one (usually the same number is choosen since ceph takes the lowes free one)
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[6:20] <doppelgrau> don???t know if best, but works for me
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[6:21] <ging> so i don't need to mark anything as lost?
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[6:22] <ging> is that for when the osd stays in but the data on it want to be wiped?
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[6:22] <doppelgrau> that is to force an osd out
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[6:22] <doppelgrau> e.g. if ceph thinks there might be newer versions of an object
[6:23] <doppelgrau> my procedure:
[6:23] <doppelgrau> 1. set weight to 0 => data is moved away
[6:24] <doppelgrau> (ceph osd crush reweight osd.123 0.0)
[6:24] <doppelgrau> 2. wait :)
[6:24] <ging> weight or reweight ? or would either do
[6:24] <doppelgrau> 3. ceph osd crush remove osd.123
[6:25] <ging> ah reweight
[6:25] <doppelgrau> 4. ceph auth del osd.123 (might not be needed without cephx)
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[6:25] <doppelgrau> 5. ceph osd rm 123
[6:25] <doppelgrau> after these steps, all traces are removed from the cluster logically
[6:26] <doppelgrau> (and if the osd is running, stop it between 2. and 3.)
[6:27] <ging> ok thanks
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[6:28] <doppelgrau> http://docs.ceph.com/docs/master/rados/operations/add-or-rm-osds/ <- the reference
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[7:07] <ging> ah shit
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[7:08] <ging> i added an my osd to crush, that seemed to have triggered it to try and rewight before i brought it up
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[7:09] <ging> and i set it's rewieght down to zero but it still left me with a massive rewight job running
[7:10] <ging> is there anyway to make it give up it's reweight ?
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[7:13] <ging> ah remove it from crusht sorted it back out
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[7:17] <ging> will starting the osd normally automatically bring it into crush?
[7:18] <m0zes> usuallly
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[8:02] <Be-El> hi
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[9:49] <mfa298> ging: from a bash prompt I've found osd.\* works with oeph tell, this is on hammer so I don't know if it works on older versions.
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[10:15] <T1w> what is a good way of checking that I have not poured more data into ceph than it can handle in case of a "simple" failure domain (eg. a single node with multiple OSDs goes down)
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[10:20] <Be-El> T1w: according to my gut you take the host weight from ceph osd tree (if you are using the default weighting in TB) and compare it to the amount of free space - free space on that host
[10:21] <T1w> mmm that would probably work
[10:21] <Be-El> add some 20-30% overhead to be on the safe side
[10:21] <T1w> I'm looking for a number I can give to management and say, that if we cross this number we are in for a baaad time
[10:22] <T1w> yeah - so there is time enough for adding more capacity
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[10:22] <Be-El> you can also check the actual capacity of each osd with 'ceph osd df' and sum up for hosts
[10:23] <T1w> I was hoping to use the output from ceph -s as a base
[10:23] <Be-El> in a homogenous setup doing the calculation once should be enough....if you have to manage a zoo similar to our cluster it might be more difficult
[10:23] <T1w> and do a bit of calculations on those figures
[10:23] <T1w> yeah, but we've only got a single pool - perhaps another once cephFS gets mature
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[10:24] <Be-El> 'ceph df' also gives a good overview, but you need to know the capacity of the failing host
[10:25] <Be-El> hmm...damned...according to the number I will run out of safe space within the next 3TB
[10:26] <T1w> woops?
[10:26] <T1w> or is it to be expected?
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[10:26] <Be-El> about 200TB total, largest host is 43 TB, 140 TB raw in use
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[11:04] <boolman> what will I benefit from the most, having SSD journals on all spinning osd nodes, or a ssd cache tier ?
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[11:13] <mfa298> T1w: I'd probably look at the outliers in osd df as well, looking through most of the drives in our cluster some say they're only 10% used, others are near 50% used.
[11:14] <T1w> mfa298: hmm - doesn't that point to the need for rebalancing instead?
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[11:15] <T1w> I've already got these set
[11:15] <T1w> mon_osd_full_ratio = .80
[11:15] <T1w> mon_osd_nearfull_ratio = .70
[11:15] <T1w> just to have ceph bark warnings at me
[11:15] <mfa298> it does, but out experience has been that if one OSD get's particularly full it can slow (and even halt) the whole cluster.
[11:16] <T1w> atm with 6 OSDs on 3 nodes I probably should lower the full ratio to .65 so I can tolerate loosing an entire node
[11:16] <T1w> okay, good to know
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[12:38] <peeejayz> Morning, anyone had any problems with download.ceph.com when using yum?
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[13:42] <kfox1111> any idea why a giant radosgw might not behave with tempurl's as documented?
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[13:49] <T1w> somone please do something about haomaiwangs repeated connects
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[14:08] <sugoruyo> hey folks, anyone know how I can get rid of old requests that are stuck?
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[14:36] <tnt> Mmmm ... RadosGW just "lost" 15000 files. That's inconvenient.
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[14:37] <tnt> They show up when doing a list on the bucket. But trying a GET or HEAD yields 404.
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[16:55] <Be-El> which mds settings are responsible for restarting the mds process due to timeout?
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[16:56] <doppelgrau> Any good Ideas why OSDs with external Journal consumes way more CPU? Only major difference I can see ist that the OSDs have a pool where failuredomain number = size
[16:57] <doppelgrau> (way more = up to ten times the CPU amount)
[16:57] <TheSov2> doppelgrau, the only think i can think of is IOwait
[16:58] <TheSov2> install sysstat and do iostat and see if iowait is high
[16:58] <rkeene> I/O wait isn't CPU time
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[16:58] <rkeene> It increases the load, but not CPU utilization
[16:58] <TheSov2> im guessing he meant its showing high loads
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[16:58] <doppelgrau> nope, I mean CPU utilization
[16:59] <TheSov2> oddsfish
[16:59] <TheSov2> it shouldnt
[16:59] <TheSov2> disk is disk
[16:59] <TheSov2> unless you are using usb or something
[16:59] <doppelgrau> no, SATA, and the CPU is ???eaten??? by the OSD process itself
[17:00] <doppelgrau> up to 180% of an 2GHz Xeon core
[17:00] <doppelgrau> (each OSD)
[17:01] <TheSov2> is that disk on a seperate bus?
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[17:02] <doppelgrau> Don???t know, but how should that affect the amount of calaculations the OSD process has to do?
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[17:04] <TheSov2> well if you are using a shitty controller that uses the main cpu to do things, no wait that would be kernel cpu not osd
[17:04] <TheSov2> hmmmm
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[17:08] <doppelgrau> and the hardware itself should be the problem, recently just added ssd for journal, before without any problems
[17:10] <doppelgrau> but the thesis with failuredomain number = size (currently for the main pool used on these OSDs) needs more computation is a bit weired too, wouldn???t think about 10 times the amount???
[17:10] <TheSov2> how large is the journal?
[17:11] <doppelgrau> latest stable ceph-version (ceph version 0.94.5 (9764da52395923e0b32908d83a9f7304401fee43)), Kernel 4.1 on xen
[17:11] <doppelgrau> 8GB
[17:12] <TheSov2> i assume you created that manually because 5gb is default
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[17:12] <doppelgrau> the partitions are created with fai, the setup later with ansible
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[17:15] <TheSov2> whats the filesystem on your journal
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[17:15] <doppelgrau> raw disk/ssd
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[17:16] <TheSov2> do me a favor just for my peice of mind, run iostat 1 0 on that and tell me what your iowait is
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[17:19] <doppelgrau> # iostat 1 1
[17:19] <doppelgrau> avg-cpu: %user %nice %system %iowait %steal %idle
[17:19] <doppelgrau> 42,29 0,00 10,54 0,26 2,44 44,47
[17:19] <rkeene> iostat 1 1 is meaningless
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[17:20] <doppelgrau> more or less number when running longer
[17:20] <rkeene> It gives you the totalCounters/systemUptime
[17:20] <doppelgrau> <5% IO wait
[17:21] <TheSov2> and its always that way
[17:21] <TheSov2> ?
[17:21] <rkeene> You'll want a minimum interval of 30s usually and atleast 1 sample, so: iostat 30 2 is the lowest you'd actually want to do
[17:21] <doppelgrau> yes, problem is OSDs eating the cake, the cpu
[17:21] <rkeene> TheSov2, If he's running iostat 1 1, it'll always stay the same
[17:22] <rkeene> Since it's useless to do so and tells you nothing
[17:22] <TheSov2> i told him to run 1 0
[17:22] <rkeene> That's a syntax error
[17:22] <TheSov2> well just 1
[17:22] <TheSov2> iostat 1
[17:22] <rkeene> 1 is too small of a sampling period to be meaningful
[17:22] <TheSov2> in my testing its a continuing output
[17:22] <TheSov2> until you quit
[17:22] <rkeene> Right, a continious set of 1 second averages
[17:22] <TheSov2> but u are right
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[17:23] <rkeene> Which you would then need to combine to make something meaningful... The computer can do this work for you
[17:23] <doppelgrau> 30s average: 46,07 0,00 16,27 5,47 12,32 19,88
[17:23] <TheSov2> 5 percent is ok
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[17:24] <rkeene> Yeah, 46% user sounds like it's spending a lot of time on CPU :-)
[17:24] <TheSov2> yes indeed
[17:24] <TheSov2> osds run in userland
[17:25] <rkeene> doppelgrau, top and hit "H" to show threads
[17:25] <TheSov2> dopp how much changes can you make to this guy?
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[17:26] <doppelgrau> rkeene: tons of osd-threads each about 5-16%
[17:26] <rkeene> doppelgrau, What state are they in ?
[17:27] <TheSov2> im thinking at this point the higher cpu is a function your osd doing a lot more work than used to
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[17:27] <doppelgrau> http://pastebin.com/Rb44X9JL <- most ???S???
[17:28] <doppelgrau> (just copied some lines)
[17:28] <TheSov2> occam's razor, whats more plausible that his osd is picky about which disk it uses for a journal or that because hes now using an ssd as a journal his osd is doing more work
[17:29] <TheSov2> doppelgrau, your osd host is a vm?
[17:29] <rkeene> Obviously, or he wouldn't have stolen time :-D
[17:29] <TheSov2> Kernel 4.1 on xen
[17:30] <TheSov2> damnit man here i thought this was a real problem
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[17:30] <doppelgrau> Xen-Dom-0, 8 Cores, high CPU-priority, enough memory (but thats the case with the other OSDs that didn???t have the problem too)
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[17:31] <rkeene> doppelgrau, Is there any sort of extra debugging enabled on these OSDs ?
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[17:32] <doppelgrau> rkeene: ???debug_osd = 0/0??? in the ceph.conf => no
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[17:36] <doppelgrau> rkeene: a full config dump from one osd: http://pastebin.com/ZYHwuaqe
[17:36] <rkeene> doppelgrau, What filesystem were you on before moving to a block device-based journal ?
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[17:37] <doppelgrau> the Data is stored on XFS, and before it was journal on the same disk (but also a partition)
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[17:42] <TheSov2> doppelgrau, are you using xen 4 per chance?
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[17:42] <doppelgrau> 4.4.1
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[17:45] <rkeene> It's not clear if filestore journal writeahead is the default for non-FS based journals
[17:45] <rkeene> Might be something worth trying to see if it influences the behaviour
[17:51] <doppelgrau> rkeene: if it cahnged something, the effect is somewhere in the ???noise???
[17:52] <rkeene> Are scrubs occuring right now on these OSDs ?
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[17:54] <doppelgrau> rkeene: no, currently some backfilling
[17:54] <rkeene> Wait for it to normalize before checking
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[17:54] <doppelgrau> but the CPU-demand was high before i started the backfilling (adding some more disks)
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[17:56] <doppelgrau> rkeene: but good Idea, wait to better isolate different influences
[17:56] <rkeene> Was the backfilling going on while you changed the journal write mode ?
[17:57] <doppelgrau> might be, currently backfilling is running slow (only 4PGs at the same time, 48 OSDs in the affected pool)
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[18:10] <wtracz2> Is Ceph suitable for running over WAN to remote office locations?
[18:10] <wtracz2> I've seen a few papers / questions on it but nothing definitive
[18:10] <m0zes> it depends on the latency of the connection usually.
[18:10] <m0zes> and, of course, expected performance ;)
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[18:15] <doppelgrau> wtracz2: OSDs - usually results in bad performance since the data might go over the WAN-Link multiple times
[18:15] <doppelgrau> wtracz2: client - depends on your usecase
[18:16] <wtracz2> doppelgrau: Use case is designers editing Photoshop files between two remote offices. Not high write throughput but would like to put a beefy edge cache in.
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[18:16] <wtracz2> Latency should be sub 100ms from both to the DC
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[18:17] <doppelgrau> 100ms Latency means 5 sequential IO/s ???
[18:17] <m0zes> 100ms is 1000x larger than most dc networks...
[18:18] <doppelgrau> wtracz2: it would work, but you will get many curses, and the users would have enough time to curse you
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[18:48] <wtracz2> OK. So, Ceph is not an option then :) Thanks
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[20:53] * Mined (~Mined@c-f9c0e455.05-162-6c6b701.cust.bredbandsbolaget.se) has joined #ceph
[20:54] <Mined> hey! Anyone running a ceph installation at home?
[20:55] <via> me!
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[20:58] <Mined> via anything big?
[20:59] <via> only 16T
[21:00] <Mined> hardware wise?
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[21:02] <via> supermicro boxes with 1u external sata enclosures
[21:03] <via> atoms
[21:03] <via> http://imgur.com/JsnT0tC
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[21:07] <Mined> via respect :D
[21:08] <Mined> I am planning a ceph installation, thinking of using this chassi http://www.fractal-design.com/home/product/cases/node-series/node-304-black
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[21:09] <via> 6 disks per node is a good ratio
[21:10] <monsted> i have a ceph cluster running on a single motherboard that's just lying on my desk :)
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[21:10] <via> that said, i dont' think theres much purpose to a single node ceph machine
[21:11] <monsted> with four 500G volumes over iscsi
[21:11] <Mined> in a whole, no, you are right. But it works
[21:11] <monsted> via: it's got four OSD and three MON hosts :)
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[21:12] <Mined> well, that box will only be used for running 2 mons, 6 osds and the 3rd mon on my main-machine
[21:12] <monsted> although i did accidentally cut power to it and haven't turned it on since, so i have no idea what state it's in :)
[21:13] <Mined> and that will be my first node, i can just add more in the future. thats the fun part of ceph, it's a living piece of hardware and software that can grow if u want it to
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[21:14] <monsted> Mined: you can run the nodes as LXC containers and get something clustery to play with
[21:15] <Mined> well, the nodes will be placed around the city i live in, main node running in my apartment
[21:16] <Mined> a friend of mine has a nice ceph network running at the moment at his hosting company
[21:22] <monsted> i can't imagine what's going to be put into that cluster ;)
[21:23] <m0zes> o/` the internet is for porn o/`
[21:23] <Mined> well for me, all my things along with friends and family...
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[21:24] <Mined> i rather spread the message of me hosting their backups rather than google/apple/microsoft... eventually i can start my own hosting company, run only with open-source software with no proprietary things
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[22:03] <lincolnb> are there any caveats with changing an OSD host's IP?
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[22:25] <doppelgrau> lincolnb: never tried, but shouldn???t be a problem since the mon get the new IP at startup of the osd
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[23:12] <TheSov3> monsted, you run how many copies
[23:13] <monsted> 2
[23:13] <monsted> planning on a third at a remote site, if i can find the space
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[23:29] <TheSov3> wait you told crush to keep 2 copies on the same box
[23:29] <TheSov3> how did you tell crush to keep them off the same osds
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[23:32] <TheSov3> im building a cluster for home use but i have a big dell switch, and 3 1u atom servers for monitors
[23:33] <TheSov3> now im buying 3 dell 720s or something similar for storage nodes
[23:33] <TheSov3> http://www.ebay.com/itm/Dell-PowerEdge-R710-8-Core-2-5-Server-32GB-RAM-PERC6i-DVD-iDRAC6-2-Trays-/171669620457?hash=item27f84e86e9:g:mPEAAOSwDFNWFDwP 710's for 330 bucks each
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[23:39] <TheSov3> monsted, ?
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[23:46] <Tetard> monsted: only 2 copies ?
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[23:56] <monsted> TheSov: i've got four OSDs each in their own LXC container
[23:58] <monsted> Tetard: just a toy, don't have anything in it that actually matters.

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