#ceph IRC Log

Index

IRC Log for 2015-04-30

Timestamps are in GMT/BST.

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[5:42] <Guest3694> Hi, geeks. I 've got an error saying "my source zone should have metadata logging enabled" where i try to run radosgw-agent.
[5:42] <flaf> Hi, with an install of a Hammer cluster, I have the "straw" algorithm in the buckets of the default crushmap, not "straw2". Is it normal? I thought that "straw2" was the default algo with Hammer. Is "straw2" production ready? Are they consequences on the ceph clients?
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[6:17] <flaf> In the release notes, I see that straw2 exists since Hammer. Why isn't straw2 the default bucket algorithm?
[6:17] <flaf> Should I change staw to straw2 in the crushmap?
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[6:23] <m0zes> straw2 doesn't work with kernel clients, yet.
[6:24] <m0zes> supposedly that is scheduled for ~4.1 kernels.
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[6:25] <flaf> m0zes: Ah ok, thx, I understand why this is not the default algo now. :)
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[6:27] <m0zes> I do wonder what kind of data movement it will cause when (and if) we can move to it on a production cluster.
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[6:29] <flaf> I have just try to upgrade straw -> straw2 on a mini testing cluster, I have seen no movement.
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[6:36] * m0zes has 24 nodes and 120 million objects. I would hope for little to no movement, but I am sure there will be some.
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[6:38] <Guest3694> Hi,geeks. How can I enable enable metadata logging of a radosgw zone? I've modified the region json, updated the regionmap and restarted radosgw. But when i run radosgw-agent, I still get the error saying I should enable metadata logging.
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[7:38] <fsckstix> Newbie question - can all administration be performed from the admin node, or does some need to occur on the OSD nodes? e.g. changing the journal size and/or location?
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[8:13] <Guest3694> "radosgw-admin region get" shows that log_meta and log_data are true, but radosgw-agent gets false result by visiting url /admin/config
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[10:26] <Be-El> hi
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[10:33] <stalob> hi
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[10:42] <sadddha> Hello. I'm trying to install a single node ceph installation using this guide https://github.com/theanalyst/ceph-bootstrap/blob/master/ceph-install.sh On command ceph-deploy --cluster localhost mon create-initial localhost I get error /var/run/ceph/localhost-mon.localhost.asok no such file or directory. When I go to /var/run/ceph I see localhost-mon.<USERNAME>.asok How do I make both of these
[10:42] <sadddha> files point to same direction? Why it uses my username for asok file and how to tell him not do it? Thanks
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[11:43] <T1w> m0zes: you said something about using 2 SSDs in a mirror, wearlevel and the 2 disks dying at the same time..
[11:44] <T1w> m0zes: do you think the differences between Samsung 840 Pro and 850 Pro is "enough" to mitigate them dying at the same time?
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[11:45] <Inflatablewoman> When running through this tutorial http://docs.ceph.com/docs/master/start/quick-ceph-deploy/ I am getting [ceph_deploy][ERROR ] RuntimeError: NoSectionError: No section: 'ceph' when trying to do the ceph-deploy install call.
[11:45] <Inflatablewoman> Any idea how to fix it?
[11:45] <T1w> as far as I know they use the same controller, but the firmware has been updated quite a bit due to the 850 using V-NAND (or 3D NAND) compared to the 840 using plain ol' NAND
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[11:50] <Inflatablewoman> think I found it
[11:50] <Inflatablewoman> http://docs.ceph.com/docs/master/install/install-storage-cluster/
[11:51] <Be-El> T1w: the 850 has a much higher write endurance than the 840
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[11:54] <Be-El> T1w: but i'm not sure whether both ssds have similar characteristics with regard to ceph (O_DSYNC for example)
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[11:54] <Be-El> T1w: if I remember correctly the 840's performance in case of O_DSYNC is horrible
[11:55] <Be-El> the 85 on the other hand is ok
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[11:59] <T1w> Be-El: well - it's for osd journal and OS
[11:59] <T1w> Be-El: m0zes just mentioned that I should make sure to use different kinds of ssds to avoid them duying at the same time
[11:59] <Be-El> T1w: and he's probably right
[12:00] <Be-El> if you can afford it, got for enterprise grade ssds
[12:00] <bd> i had better write performance using disks as journals than ssds ;)
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[12:00] <Be-El> bd: dedicated disks or journal as part of the osd partition?
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[12:01] <bd> Be-El: dedicated disk for all journals
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[12:01] <bd> Be-El: 6 disks, 5 for osds, 1 for journals
[12:01] <Be-El> bd: ah, ok, so the amount of disk seeks are quite low
[12:02] <T1w> Be-El: well.. I assume the stack of 12 840 pro's I've got laying around would make a good starting point
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[12:02] <bd> cat /sys/class/block/sdh/device/model => Samsung SSD 840
[12:02] <T1w> I intend to use a 1u machine with 2x ssd for OS and OSD journal in a mirror of sorts and 2x 43 or TB disks for 2 OSDs
[12:03] <Be-El> T1w: http://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/
[12:03] <T1w> Be-El: uh, nice
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[12:04] <Be-El> T1w: if you are starting with ceph I would recommend to read the complete blog. it's excellent for getting information about ceph from a real life perspective
[12:05] <Be-El> the author is also active on this channel from time to time
[12:05] <T1w> mmmm
[12:05] <T1w> the numbers later in that post is a bit strange
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[12:07] <Be-El> ignoring the mix up of iops and mb/s, the number are results of the dd run
[12:07] <Be-El> the important detail is the dsync option of dd
[12:08] <Be-El> and remember there's a difference between the evo and pro lines of samsung
[12:08] <T1w> mmmm
[12:08] <T1w> and yes - I'm looking at the pro editions
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[12:09] <T1w> oh well..
[12:10] <Be-El> 409600000 bytes (410 MB) copied, 11.7755 s, 34.8 MB/s
[12:10] <Be-El> that's what I get on a 850 PRO
[12:10] <Be-El> 1 TB model
[12:11] <kysse> pretty horrible
[12:11] <T1w> I guess I'm looking at having to purchase a single test-node just to test ssds etc etc before purchasing the the remaining machines and disks
[12:11] <Be-El> kysse: compared to the other values in the blog post it's ok
[12:12] <kysse> sure
[12:12] <T1w> I think it's pretty ok - if it's a 4k blocksize
[12:12] <T1w> what does that line with iops say?
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[13:41] <root_> I just did some testing of a "Samsung SSD 840" here - you can see test dd and fio tests here > http://pastebin.com/vPHtX1i1
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[13:44] <qstion> s3an2: --iodepth=1 ? try at least 16, even better 32. you are now basically testing one-client synchonuous writes
[13:45] <qstion> in real systems you will have more that one IO operation at the time
[13:45] <qstion> --bs=4k -- this is for iops testing
[13:45] <qstion> if you want to test throughput then use --bs=4m
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[13:47] <s3an2> qstion: I was just using the fio options that sebastien-han has in the blog "http://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/"
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[13:54] <qstion> s3an2: I would say these options are more for latency testing than iops or throughput
[13:56] <qstion> s3an2: and is this samsung 840 DC version or desktop?
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[13:59] <treenerd> I would suggest to increase the runtime to 10 minutes or more; because with 60 seconds and 4K it could be that only the buffer of the ssd is responding.
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[14:01] <Be-El> treenerd: the sync/dsync options should instruct the device to flush the buffer before acknowledging the write
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[14:02] <treenerd> Yes true; But on the other side I would use longer runtimes just to be sure
[14:03] <s3an2> qstion: I think this is the desktop version - SMART reports 'Firmware Version: EXT0BB6Q', 'Device Model: Samsung SSD 840 EVO 120GB'
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[14:05] <qstion> yep, this is desktop version. DC and desktop/laptop versions are built differently. DC version is tuned for DC workload (marathon) and this SSD you have is tuned for short peak loads (sprint) with 12GB cache.
[14:06] <qstion> anyway, i have a server with x24 EVO 1TB SSD desktop version and after 3 months it is running pretty good.
[14:08] <Be-El> hmm....getting rid of stale btrfs snapshots on ceph osd is way too much work
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[15:43] <fxmulder> has anyone actually gotten ceph-dokan to work?
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[16:17] <qstion> Hello guys
[16:17] * lalatenduM (~lalatendu@121.244.87.117) Quit (Ping timeout: 480 seconds)
[16:17] <qstion> i'm using ceph v0.94.1 and kernel 3.10
[16:18] <qstion> as I see removing data from RBD image does not reclaim space from OSDs
[16:18] <qstion> i have mounted those images using rbd-fuse
[16:18] <qstion> then ran fstrim on all images
[16:18] <qstion> got outputs:
[16:18] <qstion> 1.1 TiB (1167710830592 bytes) trimmed
[16:18] <qstion> 1.1 TiB (1167710835554 bytes) trimmed
[16:18] <qstion> 1 TiB (1125871489024 bytes) trimmed
[16:19] <qstion> 1.1 TiB (1186485440512 bytes) trimmed
[16:19] <qstion> but i don't see any actions on ceph
[16:19] <qstion> and "ceph osd df" still show same OSD disk usage
[16:19] <qstion> how can I really really reclaim free space?
[16:19] <cephiroth> same for me
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[16:19] <cephiroth> i tried a rollback of a snapshot
[16:19] <cephiroth> but nothign happened
[16:20] <qstion> i don't have any snapshots
[16:20] <cephiroth> yeah we use 2 different method ,but the problem is the same
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[16:28] <qstion> i had to change pool size from 3 to 2 to avoid maxing out osd usage
[16:29] <qstion> next step is pool size 1 :)
[16:29] <cephiroth> yeah no data replication :)
[16:29] <qstion> of course i could try to create new image, move all data there, then remove old image
[16:30] * AbyssOne is now known as a1-away
[16:30] <qstion> but that would require loong downtime
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[16:35] <fxmulder> when I try to start up ceph-dokan, the mon server logs: cephx server client.admin: unexpected key: req.key=0 expected_key=d7901d515f6b0c61
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[16:35] <fxmulder> looking at the debug output from ceph-dokan it is reading the keyfile though
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[16:43] <Inflatablewoman> Is there a golang ceph lib?
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[17:11] <jcsp> Go bindings: https://github.com/noahdesu/go-ceph
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[17:32] <Inflatablewoman> thanks.
[17:33] <Inflatablewoman> Is there a pure go solution. Should have asked that before.
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[17:36] <Be-El> after disabling btrfs snapshots for osd there are dangling subvolumes/snapshots on the osd devices. is it save to delete these snapshots while the osd daemon is running?
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[17:55] <fxmulder> anyone see anything in this debug log as to why the ceph client wouldn't connect? http://nsab.us/public/ceph I don't see anything glaring, the monitor it connects to says cephx server client.admin: unexpected key: req.key=0 expected_key=d7901d515f6b0c61
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[22:16] <zaitcev> Guys, I'd like to get back to an old administrative problem I'm having with a trivial cluster. Does anyone have suggestions for dummies how to make it healthy? http://www.zaitcev.us/things/ceph/ceph-003-tree-w.txt
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[22:24] <gregsfortytwo> zaitcev: it looks like you've got 2 OSDs but the default rules require 3 for PGs to be healthy
[22:25] <gregsfortytwo> old code says that's "degraded", although newer releases change it to say "undersized" in this circumstance
[22:25] <gregsfortytwo> (assuming my initial guess is correct)
[22:25] <gregsfortytwo> you can change the size of the pool to 2 and it should become happy
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[22:26] <cmdrk> hello all, is there a way to determine how much memory the MDS inode cache (mds cache size) should take? i.e., is there a fixed size (in bytes) of 1 cephfs inode?
[22:26] <zaitcev> It says osd pool default size = 2 and osd pool default min size = 1, but apparently that is not it.
[22:27] <zaitcev> http://www.zaitcev.us/things/ceph/ceph-004-conf.txt
[22:28] <cmdrk> zaitcev: you can do 'ceph osd pool get [pool name] size' to check, as well
[22:28] <cmdrk> (if, for example, the config changed after you created the pool)
[22:29] <cmdrk> likewise for min_size
[22:30] <zaitcev> ceph osd pool get data size => 2, ceph osd pool get data min_size => 1
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[22:30] <zaitcev> okay, I'll whip up a script to cycle over the osd lspools
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[22:32] <gregsfortytwo> hmm, dump your crush map then; maybe it's trying to segregate over hosts and can't
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[22:34] <zaitcev> Indeed, both OSDs are local
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[22:35] <zaitcev> That's why I added osd crush chooseleaf type = 0
[22:37] <zaitcev> http://www.zaitcev.us/things/ceph/ceph-004-dump.txt
[22:38] <gregsfortytwo> if you set "osd crush chooseleaf type = 0" in your config after you'd already created the cluster, it won't do anything
[22:39] <gregsfortytwo> you need to change it in the existing crush map
[22:39] <zaitcev> I see, thanks.
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[23:03] <zaitcev> gregsfortytwo: Thanks a lot. I decompiled the CRUSH map and set the type to "osd" in the only ruleset that I have. That seems to have working, although the cluster rushed to make deep-scrub and it's continuing right now.
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