#ceph IRC Log

Index

IRC Log for 2016-03-15

Timestamps are in GMT/BST.

[0:01] * haomaiwang (~haomaiwan@li745-113.members.linode.com) Quit (Remote host closed the connection)
[0:01] * haomaiwang (~haomaiwan@li745-113.members.linode.com) has joined #ceph
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[0:11] * ceph (~Adium@2601:192:4100:e910:e9e3:74b9:a67c:b71f) Quit (Read error: Connection reset by peer)
[0:11] * ceph (~Adium@2601:192:4100:e910:e9e3:74b9:a67c:b71f) has joined #ceph
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[0:18] * raghu (~raghu@chippewa-nat.cray.com) Quit (Remote host closed the connection)
[0:19] * danieagle (~Daniel@187.35.190.157) Quit (Quit: Obrigado por Tudo! :-) inte+ :-))
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[0:28] * vata (~vata@cable-21.246.173-197.electronicbox.net) has joined #ceph
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[0:30] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) Quit ()
[0:32] * ceph (~Adium@2601:192:4100:e910:e9e3:74b9:a67c:b71f) Quit (Quit: Leaving.)
[0:32] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) has joined #ceph
[0:36] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) Quit ()
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[0:42] * bene2 (~bene@nat-pool-bos-t.redhat.com) Quit (Quit: Konversation terminated!)
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[0:51] * fsimonce (~simon@host201-70-dynamic.26-79-r.retail.telecomitalia.it) Quit (Quit: Coyote finally caught me)
[0:51] * wschulze (~wschulze@cpe-72-225-192-123.nyc.res.rr.com) Quit (Ping timeout: 480 seconds)
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[0:56] * Nijikokun (~PeterRabb@76GAADICM.tor-irc.dnsbl.oftc.net) Quit ()
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[0:59] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) Quit (Quit: LobsterRoll)
[1:01] * haomaiwang (~haomaiwan@li745-113.members.linode.com) Quit (Remote host closed the connection)
[1:01] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) has joined #ceph
[1:01] * haomaiwang (~haomaiwan@li745-113.members.linode.com) has joined #ceph
[1:01] * wCPO (~Kristian@188.228.31.139) Quit (Ping timeout: 480 seconds)
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[1:08] * davidz1 (~davidz@2605:e000:1313:8003:8b6:c9db:bc80:acc9) Quit (Read error: Connection reset by peer)
[1:08] * angdraug (~angdraug@64.124.158.100) Quit (Quit: Leaving)
[1:08] * al (d@niel.cx) Quit (Ping timeout: 480 seconds)
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[1:17] * MentalRay_ (~MentalRay@office-mtl1-nat-146-218-70-69.gtcomm.net) Quit (Quit: My Mac has gone to sleep. ZZZzzz???)
[1:18] * natarej (~natarej@101.188.147.129) Quit (Ping timeout: 480 seconds)
[1:19] * ceph (~Adium@2601:192:4100:e910:9d82:29ff:705c:f061) Quit (Ping timeout: 480 seconds)
[1:19] * MentalRay (~MentalRay@office-mtl1-nat-146-218-70-69.gtcomm.net) has joined #ceph
[1:21] * wushudoin (~wushudoin@2601:646:8201:7769:2ab2:bdff:fe0b:a6ee) Quit (Ping timeout: 480 seconds)
[1:22] <motk> leseb: about?
[1:23] * vbellur (~vijay@2601:18f:700:9290:5e51:4fff:fee8:6a5c) Quit (Ping timeout: 480 seconds)
[1:24] * raghu (~raghu@chippewa-nat.cray.com) Quit (Quit: Leaving...)
[1:25] * LeaChim (~LeaChim@host86-171-90-242.range86-171.btcentralplus.com) Quit (Ping timeout: 480 seconds)
[1:25] * sudocat (~dibarra@104-188-116-197.lightspeed.hstntx.sbcglobal.net) has joined #ceph
[1:26] * ulterior (~luigiman@76GAADIDY.tor-irc.dnsbl.oftc.net) Quit ()
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[1:50] * oms101 (~oms101@p20030057EA03F900C6D987FFFE4339A1.dip0.t-ipconnect.de) Quit (Ping timeout: 480 seconds)
[1:53] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) has joined #ceph
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[1:57] * LobsterRoll (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) has joined #ceph
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[2:01] * haomaiwang (~haomaiwan@li745-113.members.linode.com) Quit (Remote host closed the connection)
[2:01] * haomaiwang (~haomaiwan@li745-113.members.linode.com) has joined #ceph
[2:03] * MentalRay (~MentalRay@office-mtl1-nat-146-218-70-69.gtcomm.net) Quit (Quit: My Mac has gone to sleep. ZZZzzz???)
[2:04] * haomaiwang (~haomaiwan@li745-113.members.linode.com) Quit (Remote host closed the connection)
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[2:26] * Aethis (~mrapple@76GAADIGT.tor-irc.dnsbl.oftc.net) Quit ()
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[5:36] * densinz (~densin@ppp-61-90-45-154.revip.asianet.co.th) has joined #ceph
[5:36] <densinz> hi
[5:36] <densinz> ceph monitor and ceph OSD can be same machine ?
[5:37] <densinz> ex : 3 servers , all server are OSD and mon
[5:37] <SamYaple> densinz: yes but its not advised
[5:37] <SamYaple> if one server crashes then an osd and mon drop at the same time
[5:37] <SamYaple> this locks up the cluster for a chunk of time
[5:38] <SamYaple> until a quorum is reestabilished
[5:38] <densinz> I see
[5:38] <densinz> in this sample , http://www.virtualtothecore.com/en/adventures-with-ceph-storage-part-5-install-ceph-in-the-lab/
[5:38] <densinz> it have ceph-admin server , what is it use for ?
[5:38] <SamYaple> for the record, i run ~80TB worth of data on 3 nodes all osd+mon (+compute,+other things)
[5:39] <SamYaple> densinz: its just an administration node
[5:39] <SamYaple> for managing cluster (it an exist anywhere, even on one of your three nodes)
[5:39] <SamYaple> this is all just best practice stuff
[5:39] <densinz> thank you a lot. :)
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[5:40] <SamYaple> do take special care when rebooting your nodes to stop all osds on that node first, then ceph-mon then reboot
[5:40] <SamYaple> on startup do not autostart osds or youll still have lockup
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[5:41] * thebinmut (~oftc-webi@14.139.155.210) has joined #ceph
[5:43] <thebinmut> Hi there everyone,is this the right place to CLEAR some DOUBTS related to GSOC16?
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[8:14] <Be-El> hi
[8:14] <liiwi> howdy
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[11:33] <olavgg> Hello everyone, I have a question about rados/erasure pool. When I create a erasure pool with k=17 and m=3 and try to put and object in it. Nothing happens, it just hangs. If I reduce k to 9 then it works fine. Could this be because of that I only have 9 OSD's?
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[11:40] <stein> im surprised that works aswell, no room for the codingchunks
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[12:04] <densinz> sudo ceph ---cluster=ceph --admin-daemon /var/run/ceph/ceph-mon.dcephmon.asok mon_status
[12:04] <densinz> admin_socket: exception getting command descriptions: [Errno 2] No such file or directory
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[12:05] <densinz> any clue ?
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[12:12] <etienneme> does /var/run/ceph/ceph-mon.dcephmon.asok exists?
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[12:12] <densinz> nop
[12:13] <densinz> it should be create at install state ?
[12:13] <etienneme> check for /var/run/ceph/*.asok it should exists
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[12:33] <densinz> etienneme: nothing; it should create before create-initial ?
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[12:49] <slo> should changing mon_osd_down_out_subtree_limit to "host" , "rack" default be good choice for production?
[12:50] <slo> how to, in case host does not come up any more, than one manual rebalance data due to the lost host?
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[13:18] <Titin> etienneme Vous ici :D
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[14:09] <etienneme> :]
[14:09] <etienneme> densinz: you maybe have an issue, your cluster is healthy? (ceph -s)
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[14:10] <etienneme> Or you have an old old version
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[14:26] <mistur> olavgg: you need at least k = leaf, cf crush map "step chooseleaf firstn 0 type <leaf>"
[14:26] <mistur> olavgg: leaf can be "host", "chassis", etc
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[14:27] <mistur> the best is k + m <= leaf, so in your case, k + m <= 9
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[14:29] <mistur> k = the minimum number of element you need (in your case, OSD)
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[14:29] <mistur> m = the max number of element you can loose without loossing datas
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[14:35] <mistur> olavgg: if the condition in not reach, ceph cannot allocate pg to OSDs, so pg should be stuck in "creating" status
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[16:02] <GabrielDias> hi
[16:02] <GabrielDias> I have a problem
[16:02] <GabrielDias> whan i disable on of mon server
[16:02] <GabrielDias> have an error
[16:02] <GabrielDias> 2016-03-15 18:01:47.748002 7f928703b700 0 -- :/3572513787 >> 192.168.2.68:6789/0 pipe(0x7f9270008280 sd=3 :0 s=1 pgs=0 cs=0 l=1 c=0x7f927000f1b0).fault
[16:02] <GabrielDias> 2016-03-15 18:01:50.754002 7f927c29c700 0 -- :/3572513787 >> 192.168.2.68:6789/0 pipe(0x7f9270000c00 sd=3 :0 s=1 pgs=0 cs=0 l=1 c=0x7f92700134b0).fault
[16:02] <GabrielDias> 2016-03-15 18:01:53.759966 7f928703b700 0 -- :/3572513787 >> 192.168.2.68:6789/0 pipe(0x7f9270008280 sd=4 :0 s=1 pgs=0 cs=0 l=1 c=0x7f927000f470).fault
[16:02] <GabrielDias> kile this
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[16:34] <rcarrick> I am looking at using ceph for Veeam backups and other nearline storage and have two datacenters connected by 10g with about 2ms latency. Is 2ms of latency low enough to use a multi-site configuration?
[16:36] <m0zes> it depends.
[16:38] <m0zes> how are the backups stored? cephfs? rbd? object storage?
[16:39] <rcarrick> currently they are direct attached, so this would be all new
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[16:39] <m0zes> how often are you going reading from them. how quickly do you need them restored. are you going to be writing from multiple sites? do you need cross-site restores?
[16:39] <m0zes> how would you store them then?
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[16:41] <rcarrick> My idea was to use rbd to mount it on the veeam repo
[16:41] <m0zes> if both sides are "active", I'd look at a custom crush ruleset that puts the primary osd in pg in the datacenter local to the reader/writer
[16:42] <m0zes> you'd need a ceph pool and a crush ruleset per site for that, though.
[16:43] <m0zes> that way read/writes from the client hit a local server. the writes get replicated out, but reads *will* be faster.
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[18:06] <MrBy> hi, when I try to add an rbd device on client site (jessie, kernel 3.16) echo "192.168.1.2 name=admin,secret=SECRET rbd testrbd" > /sys/bus/rbd/add , i'll get "-bash: echo: write error: Operation not supported", any idea?
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[18:51] <joshd> MrBy: check dmesg - your kernel may not support newer feature bits your cluster is using
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[18:53] <MrBy> joshd: nothing in dmesg. :(
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[18:54] <joshd> oh, is the rbd module not loaded?
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[18:56] <joelio> does a standard 'rbd map' work?
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[18:59] <MrBy> joshd: no and no
[18:59] <MrBy> I'll try to install a jessie backport kernel 4.3 and see if this solves the issue
[19:00] <MrBy> joshd: both cluster and client are running on 3.16.0-4-amd64
[19:00] <joshd> only the client kernel matters for this
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[19:01] <MrBy> same issue with 4.3.0-0.bpo.1-amd64
[19:01] <MrBy> on client site
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[19:05] <MrBy> joshd: i used name=client.FOO all the time, now with the newer kernel name=FOO it works
[19:05] <MrBy> :)
[19:06] <joshd> great :)
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[19:14] <The_Ball> Is it possible to have a erasure coded pool with a cache tier which does not cache reads?
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[19:20] <olavgg> Rhank you for your clarification mistur!
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[19:46] <arashid> is there any presentation on how cephfs lays out posix namespace on top of object store?
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[19:53] <arashid> does cephfs use a db like levelDB, or it's own implementation of K/V paris for posix metadata?
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[19:59] <gregsfortytwo1> CephFS stores the posix hierarchy data in RADOS' "omap" interface
[19:59] <gregsfortytwo1> omaps do happen to be provided by levelDB
[20:00] <gregsfortytwo1> but may not always be (in the past they used a custom thing called "tmap" instead"0
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[20:06] <arashid> is there some docs that you can point me to readup on RADOS "omap" and POSIX namespace on MDSes?
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[20:07] <gregsfortytwo1> uh, if you want to read about how CephFS works technically you should read the academic publications
[20:07] <arashid> how are directories stored? how are dirs traversed? how are a million files in a single dir stored?
[20:07] <gregsfortytwo1> Sage's thesis has it in excruciating detail
[20:07] <gregsfortytwo1> the omap stuff, not so much, although it's pretty simple: each OSD runs levelDB
[20:07] <m0zes> the answer to that last one? don't!
[20:08] <arashid> i was hoping something more simpler than Sage's thesis :)
[20:08] <gregsfortytwo1> it translates operations on omap into leveldb ops
[20:08] <gregsfortytwo1> there's not really anything in-between
[20:08] <arashid> i guess the code is my best friend? :)
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[20:54] <mistur> olavgg: you're welcome, I have asked for the same things few days ago ;)
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[21:23] <esther> hi!
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[21:23] <esther> Quick Q: I have 6 OSD's with currently 128 pg's.
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[21:24] <esther> I can safely do a 'ceph osd pool set rbd pg_num 512', right?
[21:24] <esther> And a pgp_num to 512 as well
[21:24] <esther> ?
[21:25] <kbader> what is pg_num currently?
[21:26] <esther> 128
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[21:28] <qman> that may be too high, I can't remember the exact recommendations off hand
[21:28] <lurbs> http://ceph.com/pgcalc/
[21:28] <qman> it's not particularly harmful to try as long as you're not in production, because you can just create a new rbd and migrate your data to reverse it
[21:28] <kbader> safety is a relative term
[21:29] <esther> http://docs.ceph.com/docs/master/rados/operations/placement-groups/ says 512 between 5 and 10
[21:29] <qman> those aren't quite right anymore
[21:29] <qman> I did that, and set mine too high, and it complained
[21:29] <qman> so I had to dial it back down
[21:30] <kbader> you can adjust the warnings as well
[21:30] <lurbs> mon_pg_warn_max_per_osd
[21:30] <kbader> when you increase pg_num, the current pgs will need to split
[21:30] <kbader> then pgp_num will redistribute the now split pgs
[21:31] <kbader> an aggressive increase can back up the osds, which could impact running workloads
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[21:32] <kbader> I would probably increase pg_num in smaller increments, in a production environment
[21:32] <esther> It needs to be a power of two, right?
[21:32] <kbader> pgp_num I'd probably do in a single go, so long as my backfill tunables were reasonable
[21:33] <kbader> it doesn't need to be, but it's best from a data distribution standpoint
[21:33] <kbader> if your cluster isn't particularily full, I wouldn't worry too much about non-power of 2
[21:34] <esther> It's at 63% in use now
[21:34] <esther> But I'm about to add three more OSD's in a new node
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[21:35] <esther> So I'm thinking 128 is too little to say the least
[21:35] <kbader> come to think of it, if you only increase pg_num to non-power of 2
[21:35] <kbader> then it really doesn't matter, because they are splitting in place
[21:35] <kbader> so distribution is exactly the same
[21:36] <kbader> so long as you end up at a power of 2, and use that number of pgp_num
[21:36] <kbader> *for
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[21:37] <esther> pgcalc says 512 as well. 1024 even with 9 osd's
[21:39] <esther> But the main issue would be load on the cluster, not missing data or a massive risk to loose data?
[21:40] <kbader> right
[21:40] <kbader> also, keep in mind that pg_num cannot be made smaller
[21:40] <kbader> only larger
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[21:42] <esther> Yes, I intent to grow. :)
[21:42] <esther> Coolio, I'll up the pg_num tomorrow night. Thanks!
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[22:05] <lincolnb> i've migrated some OSDs to a different CRUSH root, but a few of them still have a reasonably large amount of data (3TB+) even though recovery has completed. this is on 0.94.6 -- any thoughts as to why this might be the case?
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[22:10] <tacodog40k> does ceph support vmare's vmotion?
[22:11] <tacodog40k> i know it can be used as a datastore with an iscsi interface, but i'm not sure if i can vmotion stuff in and out of it
[22:11] <SamYaple> lincolnb: did you set the weight to 0 before move?
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[22:14] <Eduardo_> Greetings everyone. I'm trying to configure a Ceph testing environment on VMs, so am following Luca Dell'Occa's guide ( http://www.virtualtothecore.com/en/adventures-ceph-storage-part-4-deploy-the-nodes-in-the-lab/ ) I have created 4 VMs (two should be OSD's, one with monitor, then a RADOSGW, and a forth as a client VM). I am at the point where I should configure ~/.ssh/config on the admin machine. In my set up, wich should be the admin mac
[22:14] <Eduardo_> hine?
[22:14] <tacodog40k> i have been nerding over ceph for a month, btw, and reallyl like it
[22:15] <lincolnb> SamYaple: no, I didn't. I moved about 70 OSDs into the new CRUSH root and most of them seemed to drain just fine. just a few have a ton of objects
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[22:28] <tacodog40k> hrm. i guess if ceph is a rbd that might be possible.
[22:28] <Eduardo_> since it is a test enviromment is it wrong that the client and admin node be the same?
[22:29] <T1> Eduardo_: I'd go for the MON as admin-machine
[22:29] <Eduardo_> Alright, thanks T1
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[23:17] * MentalRay (~MentalRay@office-mtl1-nat-146-218-70-69.gtcomm.net) Quit (Quit: My Mac has gone to sleep. ZZZzzz???)
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[23:36] * rendar (~I@95.239.176.86) Quit (Quit: std::lower_bound + std::less_equal *works* with a vector without duplicates!)
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[23:55] <ElNounch> Hello ^^ Any special step needed to enable xattr on a cephfs ?
[23:56] * karnan (~karnan@106.51.136.181) Quit (Ping timeout: 480 seconds)

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