#ceph IRC Log

Index

IRC Log for 2016-08-22

Timestamps are in GMT/BST.

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[6:01] <yuelongguang> hi, how to set osd's cpu-affanity?
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[9:37] <IcePic> yuelongguang: as opposed to setting any other programs affinity?
[9:38] <IcePic> seems simple to find a command you prepend before starting a linux program to set its affinity.
[9:38] <IcePic> if that is the actual problem of course.
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[9:43] <yuelongguang> IcePic, i made it by using taskset to start osd process. according to my test, taskset did not take effect if osd is running
[9:44] <IcePic> no, you prepend it before starting normally.
[9:44] <IcePic> but did it solve the underlying problem?
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[9:51] <yuelongguang> IcePic, i want to isolate osd and qemu
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[9:59] <komljen> Hi everyone, I'm wondering is there a possibility to merge exported base and diff files without ceph? I know about rbd merge-diff, but this works only for merging two diffs...
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[11:05] <topro_> hi there, its me again ;) despite the inconsitent PGs of my metadata pool (which we discussed last week) i also have a couple of (lets say 5) PGs of my data pool which are inconsistent an a repair would fail (for no obvious reason). any ideas?
[11:08] * hellertime (~Adium@pool-71-162-119-41.bstnma.fios.verizon.net) Quit (Quit: Leaving.)
[11:08] <topro_> ^^ ceph jewel
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[11:40] <IcePic> topro_: no more help from me this week, unfortunately.
[11:41] * IcePic got his jewel radosgw to work finally though, if we're on the "weekly-update" point now. ;)
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[13:36] <Syt> hi all, I have tot test an upgrade path from hammer. Unfortunately it seems ceph-deploy won't install hammer anymore, it seems ceph-osd and ceph-mon are missing in the ceph repo. Am I doing something terribly wrong or...
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[13:57] <sep> Syt, did hammer ever have the packages split like that ? i imagined hammer was before the package split
[13:59] <Kvisle> IcePic: you're using aws4 on jewel?
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[14:26] <Syt> sep, don't know, the packages are there in jewel. Waited for 2 hours and it works :S hate that.
[14:26] <sep> in jewel they are split into separate pacakges yes
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[14:30] <Syt> What I changed was going from ceph-deploy 1.5.35 to 1.5.34 and it worked whoch cannot be the issue. anyway, works fine right now, Thanks ;)
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[14:32] <Jeeves_> Hi.
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[14:38] <Jeeves_> Can anyone tell me how I can list all rados-gw users?
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[15:11] <IcePic> Jeeves_: radosgw-admin metadata list user
[15:12] <Jeeves_> Yes, just found it. Thanks!
[15:12] <Jeeves_> And via REST?
[15:12] <Jeeves_> I'd expect /metadata/list/user ..
[15:12] <Jeeves_> But that doesn't seem to work
[15:12] <Jeeves_> Ah, without list
[15:13] <Jeeves_> Can I change the tenant for a user?
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[15:24] <brad[]> Hi all, for conceptual purposes - can someone guide me through what "moving" a mon would look like? Can it be transplanted? Or would spinning up new mons and killing old ones be the proper strategy?
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[15:25] <doppelgrau> brad[]: I had sucessfully done the add new and remove old strategie
[15:26] <brad[]> doppelgrau: One at a time? Or as many as required to maintain an odd number on fail?
[15:32] <doppelgrau> one at a time, there is no dependency to have an odd number, only that ceph only runs if the majority is up (majority of 3 => 2, majority of 4 => 3 so in both cases you can tolerate one failure => even numbers do not make sense)
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[15:39] <brad[]> ah ok
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[15:53] <m0zes> add new, then remove old makes the most sense. monitor ip addresses are stored in the monmap, so transplanting them is a PITA. just don't do it.
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[17:45] <wes_dillingham> So I just tested my ???deep scrub distribution??? http://ceph.com/planet/deep-scrub-distribution/ and it appears 100% of my deep scrubbing is loaded up on sunday and monday, is this the intended default behavior? I have not modified the deep scrub timing settings for this cluster.
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[17:49] <theeboat> hello, I was wondering if someone could advise me on the speeds i'm receiving from ceph. I've just set up a standard installation with 7 6TB HDs into one pool. When I share this over SMB or NFS I am receiving low transfer speeds of 40/50 MB/s. Am I ignorant in thinking I should be getting higher speeds than this out of the box?
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[17:50] <m0zes> theeboat: single client speeds? multiple clients should be higher than single...
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[17:51] <theeboat> m0zes: single client speed. when i increase the amount of client it drops to around half of what i was receiving. Also this is both read and write.
[17:51] <m0zes> 7*200MBps / 2 (journaling) / 3 (replication). then you've got the overhead of the network filesystem. how many nodes, and what is the networking?
[17:52] <theeboat> its a single node as I am testing at the minute and that's over a 10Gb network.
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[17:53] <m0zes> single node... what kind of cpu/memory?
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[17:54] <theeboat> twin 6C Xeons and 32GB ram
[17:56] <m0zes> try running some various benchmarking to see if we can find a bottleneck. I'd try a rados bench first. http://tracker.ceph.com/projects/ceph/wiki/Benchmark_Ceph_Cluster_Performance
[17:58] <theeboat> I've already ran through the rados bench commands and i receive the speeds as mentioned when previously when writing but using seq and rand command i receive around 1700MB/s. Again when using dd to write directly to the direct as in the first example on the link you've sent i receive around 130MB/s
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[18:10] <m0zes> ahh, each disk is only getting ~130MBps... that changes the max throughput numbers quite a bit. 7*130 / 2 / 3. meaning peak performance of 151MB/s. are the disks plugged directly into the motherboard or through an HBA?
[18:13] <m0zes> you may be maxing out the performance out of the box with that number of cores at that clock speed. take a look at dstat or atop while running the bench write, then perhaps we can see how much of the cpu is in use, and disk i/o...
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[18:38] <doppelgrau> wes_dillingham: by default ist depends on the time of the pool creation ans (very very) slowly distributed a bit over the time
[18:39] <wes_dillingham> doppelgrau: thanks. Is there a good way (and would it be advisable) to simply say, spread this evenly out over the entire week, starting now.
[18:40] <doppelgrau> wes_dillingham: I use this script (also to put the scrub-load in the hours with reduced load) https://www.formann.de/2015/05/cronjob-to-enable-timed-deep-scrubbing-in-a-ceph-cluster/
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[18:40] <doppelgrau> wes_dillingham: and distributing the load is advisable, less peaks
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[18:41] <wes_dillingham> yea, i came across this being an issue because i was noticing slow requests peaked during these days
[18:41] <wes_dillingham> thaks fo rthe help doppelgrau
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[20:59] <blizzow> watching ceph -w while my cluster rebalances with a new node and 5 OSDs shows recovery rates that spike up past 300 MB/s. doing an: rbd export mypool/myimage.img gets me read rates of maybe 70MB/sec. Why would my recovery/rebalance operations operate at 5x my read rates?
[21:00] <doppelgrau> blizzow: parallel operations
[21:03] <blizzow> doppelgrau: shouldn't a read pull from 3 sources (assuming my replication factor is 3) in parallel?
[21:03] <doppelgrau> blizzow: no, primary
[21:05] <blizzow> so reads are really the maximum speed of one drive, and writes have a penalty due to having to write three times? Yikes. :/
[21:06] <blizzow> It seems like raid (software or hardware) on my OSD nodes would be really beneficial then.
[21:06] <doppelgrau> blizzow: if you have one single sequential read, ceph is not good sequential, parallel IO where it scales
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[21:33] <wes_dillingham> is the ???mon osd down out interval??? set at 300 seconds by default because this is ideal in preventing false-positives of OSDs being marked down when they are really just laggy, or is this set at 300 because thats an approximate amount of time that an osd host would take to reboot, and we are assuming people wont set the noout flag?
[21:35] <wes_dillingham> Im seriously considering cranking this interval down to something like 30 seconds as it seems that osd failure heavily impacts my guest vms and I want to optimize in preventing that, those with heavy vm workloads, curious how you tune this setting.
[21:40] <T1> I'd say it's set to 300 to avoid beginning reshuffle of data in the event of an unscheduled reboot of a node with multiple OSDs
[21:41] <doppelgrau> wes_dillingham: time until out, not down
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[21:44] <T1> down is way lower
[21:45] <wes_dillingham> yes, the time interval between down and out is what i want to shorten doppelgrau , as it seems this is the window in which vms are unable to write, the quicker they get marked out (in case of actual disk failure) the better as new map gets generated and new primary osd is elected and writes can continue
[21:45] <T1> it's long grace period before starting a heavy operation
[21:45] <doppelgrau> wes_dillingham: size=min size?
[21:45] <wes_dillingham> my size=3 and min_size=2
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[21:45] <doppelgrau> wes_dillingham: 1 <= typically min_size < size
[21:46] <doppelgrau> and I have no problems with down osds, vms running without problems
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[21:47] <wes_dillingham> doppelgrau: is that an artifact of the guest filesystem hadling the issue gracefully? My understanding is that if an osd is primary for an object,
[21:48] <doppelgrau> wes_dillingham: and if the primary is down, an other osd becomes the acting_primary
[21:48] <wes_dillingham> a client trying to write to that object will hang until it receives a new map and is able to write to the new primary, and this only happens when an osd is marked out
[21:50] <doppelgrau> wes_dillingham: is the osd marked down? that is enough, trust me, running nearly 1k VMs on ceph and they keep running while rebooting servers with osds (and during reboot it???s only down, not out)
[21:51] <wes_dillingham> Yes, the OSDs are marked down almost instantly
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[21:52] <wes_dillingham> doppelgrau: I test by physically yanking the disk??? they go down within about 10 seconds
[21:52] <doppelgrau> wes_dillingham: what does ceph -s reports while the osd is down, not yet out
[21:52] <wes_dillingham> I would have to historically check its been a bit since ive tested this way
[21:53] <wes_dillingham> ceph was reporting the expected # of osds as being ???down"
[21:54] <wes_dillingham> so upon being marked down the ???acting_set??? is immediately updated and so the time to go from down to out really shouldnt imact vms ability to write (assuming the min_size threshold hasnt been passed)
[21:55] <wes_dillingham> ?
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[21:55] <doppelgrau> wes_dillingham: to avoid data movement during longer reboots I set mon_osd_down_out_interval to 1200
[21:56] <doppelgrau> wes_dillingham: right
[21:57] <doppelgrau> wes_dillingham: with spinnig disk, you can expect slow requests when it comes up again (???waiting for degraded object???)
[21:59] <wes_dillingham> doppelgrau: does tweaking that interval require you injecting that arg into each and over osd?
[21:59] <wes_dillingham> each and every*
[21:59] <wes_dillingham> and mon
[21:59] <doppelgrau> wes_dillingham: mon parameter => injecting to each mon and/or config file
[22:01] <wes_dillingham> ok, thats helpful, doppelgrau, thanks. It helps correct a misunderstanding about what I think is happening
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[22:23] <wes_dillingham> so doppelgrau, looking at the default settings for marking an osd ???down??? I see that it takes one osd, three reports in order to mark the osd down. The osd heartbeat interval is 6 seconds and the osd heartbeat grace is 20, does that mean it takes 6 seconds to initiall detect down, waits 20 seconds, reports to mon initially, waits 20 more seconds and reports again, waits 20 more seconds and reports a third time (max time = 66 seconds to go
[22:23] <wes_dillingham> ???down???) or does it notice its down after 6 seonds, waits 20 seconds and then pings the monitor 3 times in quick succession? so about 26 seconds max time till ???down???????
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[22:33] <doppelgrau> wes_dillingham: not so sure atm, did not remeber the sequence charts atm (it???s late here)
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