#ceph IRC Log

Index

IRC Log for 2016-04-01

Timestamps are in GMT/BST.

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[0:35] <lae> wrt bluestore becoming the default backend for rados - is that planned to be retroactively applied to existing OSDs during an upgrade?
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[0:45] * garphy is now known as garphy`aw
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[0:49] <aarontc> lae: I'm not authoritative on this but I'd assume no, you will need to create a new OSD with the new backend and let data migrate, then remove the old OSD
[0:50] <lae> yeah, that makes the most sense
[0:50] * Lea (~LeaChim@host86-168-120-216.range86-168.btcentralplus.com) Quit (Ping timeout: 480 seconds)
[0:50] <lae> (given what I know)
[0:51] <lae> i'm guessing though that there might be a simplified process of maybe destroying OSDs and recreating them with bluestore
[0:51] <lae> until the entire cluster's migrated over
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[2:55] <motk> good morning ceph
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[8:03] <skullone> this new 22 core, 44 thread CPU makes a lot of sense
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[8:13] <brians__> skullone show off :)
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[8:28] <skullone> i dont have one yet
[8:28] <skullone> but, doing the math, it works out for a lot of needs
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[9:43] <IcePic> we will soon have to invent even more cpu-demanding tasks for the computer to do, if cores are going to explode like that
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[11:40] <irq0> Morning, I'm doing some tests on a 600 OSD 4 node ceph cluster and I see ~100ms latency for 4 MB RADOS write_fulls. Is that in line with common expectations? Does anyone have data to compare?
[11:41] <T1w> 600 OSDs on 4 nodes!?
[11:42] <irq0> oh sorry mistake. 8 nodes ;)
[11:42] <T1w> that seems.. a bit excessive
[11:43] <Walex> irq0: I see latencies of 1-5 seconds for reads and 10-20 for writes on one system that uses large (6TB) drives and is under load.
[11:43] <T1w> as long as you have a 3-digit amount of OSDs on less than a 2-digit number of nodes I would presume certain issues to arrise pretty darn quick
[11:43] <T1w> and 100ms latency in a setup like that is IMO pretty much to be expected
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[11:44] <Walex> irq0: the issue is as always IOPS-per-TB and how many client threads end up sharing a single disk arm.
[11:44] <T1w> .. and I/O to the node
[11:44] <irq0> at the moment i have two test clients with 8 writers each
[11:44] <irq0> my disks are below 10% utilization
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[11:45] <Walex> T1w: that is an issue if you are lucky and the bottleneck is not IOPS :-)
[11:45] <irq0> 100ms feels a bit too much
[11:45] <Walex> irq0: perhaps you expect a bit too much.
[11:45] <T1w> with 75 OSDs per node that's "network I/O devided by 75" possible throughput
[11:45] <T1w> Walex: indeed!
[11:46] <T1w> what kind of cluster network is between those nodes?
[11:46] <Walex> irq0: note that latency is usually measured from request to _first_ byte, here you are measuring it apparently to the _last_ byte of 4MiB, that is you are also inclduing a measurement of bandwidth.
[11:47] <irq0> Walex: yes, right I actually measure that
[11:47] <T1w> .. and writing N copies of the data on N OSDs
[11:47] <T1w> .. which means that the data will travel over the network 4 times if you have 3 copies
[11:48] <T1w> oh, sorry nu
[11:48] <T1w> just 3
[11:48] <irq0> i have 40Gbits internal network and 10GBit internal. all not close to max
[11:48] <Walex> irq0: so what you are seeing is that you can "commit" 10x 4MiB requests per second, but not clear per-what.
[11:49] <Walex> irq0: how many physical disks (arms) per node have you got?
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[11:51] <irq0> around 60
[11:52] <irq0> for the pool i'm testing
[11:53] <Walex> so around 480 disks in total, across 8 nodes? What's the aggregate write rate with your 2 client systems with 8 threads each?
[11:53] <irq0> ~500MB/s
[11:54] <Walex> irq0: per client system or 250MB/s per client system?
[11:54] <Walex> irq0: double checking...
[11:54] <irq0> combined
[11:54] <irq0> I don't have per client stats
[11:54] <Walex> irq0: that is a bit on the low side though.
[11:54] <irq0> and the writer processes aren't close to maxing out CPUs
[11:54] <Walex> irq0: never mind the CPUs...
[11:55] <Walex> as you wrote "disks are below 10% utilization" they don't seem to be the bottleneck (if you are measuring utilization right).
[11:56] <Walex> irq0: I would start by using 'nuttcp' to check effective transfer rates between clients and 'mon' systems and between clients and 'osd' systems, just to be sure.
[11:57] <irq0> iostat -x -j PATH -k -y 10 1
[11:57] <irq0> for dist util
[11:57] <Walex> irq0: the 100ms is not too terrible, but the aggregate transfer rate is really on the low range.
[11:58] <Walex> irq0: that 'iostat' is a good approach, 10s is too long an interval though usually.
[11:59] <Walex> irq0: I like 'iostat -dkxyz 1'
[11:59] <irq0> I haven't done the math, but my guess is that the 100ms limits the transfer rate of my 8 processes
[12:00] <irq0> and the 100ms is what concerns me a bit
[12:00] <irq0> i think I'll have to dig through the performance counters
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[12:04] <titzer> irq0: which tests do you run? I'd be interested in seeing what I get from my cluster (fairly low end one though)
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[12:06] <irq0> titzer: I run some custom code to replay a ~1.5PB dump of an archive system with dummy data and use statsd/graphite to store the measurements
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[12:06] <titzer> ahh
[12:07] <irq0> I did some simulations with that data to measure the balance (data/osd) of that data that i try to verify as well
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[12:09] <irq0> I can push the code of the replay too if someone is interested :)
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[14:16] <andrei111> hello guys
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[14:16] <andrei111> i've got an issue with my ceph cluster. was hoping someone could help ,me
[14:17] <andrei111> i've got 2 ceph osd servers with 9 osds
[14:17] <andrei111> i had an issue where one of the disk
[14:17] <andrei111> failed on me a few days ago
[14:17] <andrei111> on one of the osd servers
[14:18] <andrei111> and today the other osd server also had a failed disk
[14:18] <andrei111> by failed disk I mean not the physically failed#dead disk, but rather the partitioni level failure and auto remount in ro mode
[14:18] <andrei111> i've rebooted one of the osd servers
[14:19] <andrei111> and it is currently doing recovery (the previously failed disk has been mounted okay)
[14:19] <andrei111> my question is: is it safe for me to reboot the second osd server while the recovery is taking place?
[14:20] <andrei111> my hope is that after a reboot, the osd would be mounted okay and I would get a working cluster
[14:20] <andrei111> at the moment all my vms are hanging with high IO wait
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[14:23] <andrei111> anyone alive ???
[14:23] <sep> andrei111, what is your min size ? i think the default is 2. so any missing disk = hanging IO
[14:24] <sep> since you have only 2.
[14:25] <andrei111> yeah, the ,o
[14:25] <andrei111> sorry
[14:25] <andrei111> the min size is 2
[14:25] <andrei111> there is one disk which is currently in Down
[14:25] <sep> and is the pool size also 2 ? since you only have 2 nodes ?
[14:25] <andrei111> as I can't mount it without rebooting
[14:25] <andrei111> yeah, that's right
[14:25] <andrei111> i've just have two nodes and the replica is set to 2
[14:26] <sep> so there is no resiliency. any disk down ? no io and no traffic until the recovery is finished
[14:27] <andrei111> well, typically, when I have a single disk failure i have io, no issues here
[14:27] <andrei111> but today i had two disks on different servers failed
[14:27] <andrei111> so, there is a limited io
[14:27] <andrei111> but majority of servers are pretty dead
[14:27] <andrei111> i mean the vms running on the ceph cluster
[14:28] <andrei111> sep: do you think i can reboot the second server while the recovery is taking place? so that at least I would have all osds in UP state?
[14:29] <andrei111> or should I wait for the recovery to go as much as it can
[14:29] <andrei111> and only after that reboot the osd server with the remaining DOWN osd?
[14:29] <sep> have you reduced the failiure domain to osd ?
[14:30] <andrei111> nope, i've not changed anything related to the failure zones
[14:30] <sep> you can reboot, but the recovery would stop while it's booting and all io would hang ofcourse.
[14:30] <andrei111> i'ts all standard
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[14:31] <andrei111> will I not make things worse when rebooting during the recovery?
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[14:31] <sep> i am by no means an expert tho. so..
[14:32] <sep> yes worse since all io will hang
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[14:35] <sep> andrei111, but i would very much recomend getting another node. since you realy want size > min size
[14:35] <andrei111> sep: thanks for your input
[14:35] <andrei111> yeah, i've been meaning to do it for a while, but lack of funds at the moment
[14:35] <andrei111> ((
[14:36] <andrei111> anyone else could share their input on this issue?
[14:36] <sep> optinally... reduce failure domain to osd. and grow size. you you would have size 3 and 2 object on one node (different osd) and 1 on an osd on other node ;; but that's a bit tricky and non standard. so i do not know how to do that without heavy googeling :)
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[14:37] <andrei111> would you recommend rebooting the second osd server with the currently failed osd and continue the recovery process? or wait for the current recovery to go as far as it can and reboot the server after that?
[14:37] <andrei111> anyone else?
[14:38] <sep> i would probably reboot. since if the disk comes back, it will start using the disk again. and the recovery will be reverted. if the disk does not come back the recovery can continue afterwards anyway.
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[14:41] <andrei111> sep, my thoughts too
[14:42] <andrei111> just wasn't sure and didn't want to make things worse
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[14:55] <andrei111> sep: thanks for your help. i will try to reboot
[14:57] <sep> good luck! hope i did not lead you into misery... since as i said. i am no expert. just a user looking to support as well
[14:57] <sep> get another node!
[14:59] <sep> and grow pool size... since how you can maintain io with pool size=min size and a down disk i can not even begin to guess on. perhaps by pure luck ?
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[15:03] <andrei111> I will
[15:03] <andrei111> and hopefully very soon
[15:03] <andrei111> as soon as my server responds I will send an email with the order
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[15:04] <andrei111> sep: in the past i had no issues with working with 2 osd server. while i was doing maintenance on one of them
[15:04] <andrei111> a single osd server would work perfectly well
[15:04] <andrei111> but i'
[15:05] <andrei111> but i've not had an issue where i had disk failure on both osd servers
[15:05] <andrei111> that will teach me a lesson
[15:07] <sep> andrei111, i'd assume reads would work. but min size =2 shoudl in theory mean no writes if the pg is degraded.
[15:08] * ira_ is now known as ira
[15:08] <ira> What is the recommended way to install ceph now? ceph-deploy or ceph-ansible?
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[15:25] <andrei111> ira: it's been a while since i've installed ceph (back in the days of manual install, not even ceph-deploy), but the ceph-deploy has been created to automate ceph deployment. so, i guess you should give it a go
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[15:27] <ira> andrei111: I have scripts using it, they've broken on F23. :/
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[16:07] <sep> ira i use fai.....
[16:08] <ira> sep: For Fedora? :)
[16:08] <sep> debian
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[17:01] <osskilledbyjews> any nonjews here?
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[17:11] <os_sk_illedbyjuws> t i r e d o f j e w s, l i e s , a n d b a d s o u n d ? a d d m e t o t o x. m y i d i s E E E D E 7 2 B 6 1 8 7 4 2 5 7 0 0 F C A 0 7 D 1 B 3 F C 2 D 4 9 C 6 C 5 B 6 B D A E F A 8 1 9 D 3 5 9 7 6 E 8 8 6 0 B 2 E 7 D F D F 6 F C 4 9 E A F 5 r e m o v e s p a c e s ....
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[17:12] * m0zes thinks someone need k-lined
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[18:51] <Axion_Joey> hi everyone
[18:51] <Axion_Joey> anyone got time to help a newbie out?
[18:52] * garphy`aw is now known as garphy
[18:52] <Axion_Joey> I just created a 5 node cluster (3 monitors and 2 OSD hosts) using ceph deploy
[18:53] <Axion_Joey> Everything was working well
[18:53] <Axion_Joey> I rebooted each monitor and they came up perfectly
[18:53] <Axion_Joey> I rebooted an OSD and it shows offline
[18:53] <Axion_Joey> I've been googling for the past day and can't figure out what I need to do to make it show active again
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[18:54] <Axion_Joey> [root@cephnj1 ~]# ceph -s cluster bff7234c-6c57-45aa-8757-d0d9a80acf62 health HEALTH_WARN 176 pgs degraded 176 pgs stuck degraded 256 pgs stuck unclean 176 pgs stuck undersized 176 pgs undersized monmap e3: 3 mons at {cephmonnj1=10.3.16.30:6789/0,cephmonnj2=10.3.16.31:6789/0,cephmonnj3=10.3.16.32:6789/0} election epoch 24, quorum 0,1,2
[18:54] * thomnico (~thomnico@2a01:e35:8b41:120:15d6:a379:b199:baea) Quit (Ping timeout: 480 seconds)
[18:55] <BranchPredictor> Axion_Joey: see logs for your osds
[18:55] <BranchPredictor> Axion_Joey: see if ceph-osd processes are running
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[18:58] <Axion_Joey> Thanks Branc
[18:58] <Axion_Joey> on Centos 7 how do I see of cephs-osd is running?
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[18:59] <BranchPredictor> Axion_Joey: ps aux | grep ceph-osd
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[18:59] <BranchPredictor> on machine that is hosting them of course
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[19:02] <Axion_Joey> looks like it's running: root 3339 0.0 0.0 112644 960 pts/0 S+ 10:01 0:00 grep --color=auto ceph-osd
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[19:02] <BranchPredictor> no, it's not
[19:02] <BranchPredictor> it's just a grep process looking for ceph-osd in "ps aux" output
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[19:03] <Axion_Joey> got it
[19:03] <Axion_Joey> I swear I'm not an idiot. Centos changed a lot of stuff in Centos 7 that wasn't broken in Centos 6
[19:03] <BranchPredictor> see the logs for those osds, maybe they're just not started automatically
[19:04] <via> i still am unable to get my osd's to systemctl enable my osd's on el7/ceph9.2
[19:04] <Axion_Joey> this is in the osd-admin log
[19:04] <via> it worked great with the old init system
[19:04] <Axion_Joey> 2016-04-01 08:53:44.752936 7fc1bc22b900 0 ceph version 9.2.1 (752b6a3020c3de74e07d2a8b4c5e48dab5a6b6fd), process ceph-osd, pid 4720 2016-04-01 08:53:44.752961 7fc1bc22b900 -1 unrecognized arg start
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[19:06] <BranchPredictor> I don't know much about ceph with systemd, but you could try something like "ceph-osd -c /path/to/ceph.conf -i <osd_number>"
[19:07] <Axion_Joey> Just tried that
[19:07] <Axion_Joey> this is the output
[19:07] <Axion_Joey> [root@cephnj1 ~]# ceph-osd -c /etc/ceph/ceph.conf -i 0 2016-04-01 10:07:02.863735 7fa441b0e900 -1 ** ERROR: unable to open OSD superblock on /var/lib/ceph/osd/ceph-0: (2) No such file or directory
[19:07] <Axion_Joey> Also we're just getting started with ceph
[19:07] <Axion_Joey> if there's a better (easier, more reliable) distro than Centos 7 we can definitely switch to it
[19:08] <BranchPredictor> Axion_Joey: see what's in /var/lib/ceph/osd
[19:08] <BranchPredictor> maybe you need to mount it
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[19:08] <Axion_Joey> [root@cephnj1 ~]# ls /var/lib/ceph/osd/ ceph-0 ceph-1 ceph-2
[19:09] <BranchPredictor> and what's in /var/lib/ceph/osd/ceph-0?
[19:09] <Axion_Joey> it's empty
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[19:09] <BranchPredictor> yep
[19:09] <BranchPredictor> you probably need to mount it
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[19:10] <Axion_Joey> thanks. googling
[19:11] <BranchPredictor> man mount
[19:11] <BranchPredictor> see /etc/mtab and/or /etc/fstab
[19:11] * garphy is now known as garphy`aw
[19:12] <kcwong> ok. mounting of OSD volumes is handled by udev rules, not /etc/fstab
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[19:12] <BranchPredictor> probably, I'm not sure about his setup.
[19:12] <kcwong> and for that to work right, the partition used for the OSD volume needs to be GPT with a specific typecode.
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[19:13] <Axion_Joey> I used ceph-deploy osd prepare and ceph-deploy osd activate to partition the drives
[19:13] * garphy`aw is now known as garphy
[19:13] <kcwong> On CentOS 7, you'd find the rules in /usr/lib/udev/rules.d/95-ceph-osd.rules
[19:14] <Axion_Joey> The rules are there
[19:14] <Axion_Joey> do you have to manually trigger them after a reboot?
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[19:16] <kcwong> before you do that, double check the typecode matches
[19:16] <kcwong> sgdisk -i <partition number> /dev/<disk>
[19:16] <Axion_Joey> on it
[19:16] <kcwong> for example: sgdisk -i 1 /dev/sdb if /dev/sdb1 is used for OSD
[19:17] <Axion_Joey> [root@cephnj2 tmp]# sgdisk -i 1 /dev/sdb Partition GUID code: 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D (Unknown) Partition unique GUID: B93DBF59-EEAE-4AE4-99E7-DBF2A2897215 First sector: 10487808 (at 5.0 GiB) Last sector: 1875384974 (at 894.3 GiB) Partition size: 1864897167 sectors (889.3 GiB) Attribute flags: 0000000000000000 Partition name: 'ceph data'
[19:18] <kcwong> I've wrestled with my ceph setup using ceph-ansible for almost 2 weeks...
[19:18] <kcwong> that looks right: 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D
[19:18] <ska> Is there a way to get ceph events directly from a monitor? how?
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[19:20] <Axion_Joey> yeah. any ideas on how I can manually mount them
[19:20] <Axion_Joey> or better yet figure out why they're not mounting automatically after a reboot
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[19:22] <kcwong> anything in logs?
[19:22] <Axion_Joey> Apr 1 10:17:17 cephnj2 systemd: Device dev-disk-by\x2dpartlabel-ceph\x5cx20data.device appeared twice with different sysfs paths /sys/devices/pci0000:40/0000:40:03.2/0000:44:00.0/host0/port-0:0/expander-0:0/port-0:0:4/end_device-0:0:4/target0:0:4/0:0:4:0/block/sde/sde1 and /sys/devices/pci0000:40/0000:40:03.2/0000:44:00.0/host0/port-0:0/expander-0:0/port-0:0:1/end_device-0:0:1/target0:0:1/0:0:1:0/block/sdb/sdb1 Apr 1
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[19:27] <kcwong> hmm
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[19:31] <kcwong> it looks like 'ceph-disk' always label the data partition 'ceph data' which means this kind of collision will always happen.
[19:31] <Axion_Joey> I know lots of people use ceph in production
[19:31] <kcwong> it's beyond my knowledge now. i've only set up one OSD volume per host
[19:32] <Axion_Joey> got it
[19:32] <kcwong> I'd like to know the answer to this as well.
[19:32] <Axion_Joey> I really appreciate your help
[19:32] <kcwong> as for testing out udev rules, you can try udevadm test
[19:33] <kcwong> aj: np; it is why we have this channel. I'm as much a ceph noob
[19:36] <Axion_Joey> I know it's not the most graceful solution, but I just re-ran ceph-deploy osd activate and it brought it back up
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[19:36] <Axion_Joey> but there's got to be a better way
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[19:37] <kcwong> that's weird. What is in /dev/disk/by-partlabel/?
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[19:39] <Axion_Joey> [root@cephnj2 log]# ls /dev/disk/by-partlabel/ ceph\x20data ceph\x20journal
[19:39] <kcwong> ?! but you still have 3 OSD volumes on that host?
[19:39] <Axion_Joey> yup
[19:39] <Axion_Joey> it came back up normally
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[19:40] <kcwong> whoa... very baffling
[19:40] <Axion_Joey> do you use hardware raid on your servers and present one large drive to ceph?
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[19:41] <kcwong> no. every node in the cluster share one drive as OSD
[19:41] <kcwong> i don't have dedicated storage hosts
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[19:42] <kcwong> the redundancy should already be provided by ceph; so, i want to keep everything else as simple as possible
[19:42] <kcwong> and sure enough, ceph is a beast.
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[19:45] <kcwong> perhaps this is a question for the mailing list: how does ceph-disk handle the volume label collision problem.
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[20:07] <Axion_Joey> for anyone that has the same problem I had
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[20:07] <Axion_Joey> just add the mount info to /etc/fstab and osd's come back up perfectly after a reboot
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[20:56] <Axion_Joey> sorry guys I lied
[20:57] <Axion_Joey> adding the drives to fstab bring them up and they show as online, but the state never goes healthy
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[21:00] <Axion_Joey> there's got to be something missing in the ceph-deploy script on Centos 7 that stops drives from being mounted and active after a reboot
[21:00] <daiver> guys, question about MDS. I installed MDS on the node2 in my test cluster with "ceph-deploy mds create ceph-node2". mds service started, but I don't see "mdsmap" in "ceph -s".
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[21:01] <daiver> http://pastebin.com/bh8s5m5r - any ideas
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[21:23] <m0zes> Axion_Joey: I'm using centos 7 and we have had no issues.
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[21:28] <[arx]> daiver: you won't see it until you create a filesystem
[21:29] <daiver> sorry for stupid question, but how to create it?
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[21:30] <daiver> I tried to mount with ceph-fuse, but command simply freezes
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[21:33] <[arx]> ceph fs --help
[21:33] <[arx]> you need a metadata pool and a data pool before creating it
[21:33] <[arx]> ceph fs new metadata_pool data_pool iirc
[21:34] <[arx]> ceph fs new filesystem_name metadata_pool data_pool*
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[21:36] <daiver> thanks, that worked, now I see the mdsmap in "ceph -s"
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[22:41] <brians__> ssd cache tier overkill for 16 OSDs ?
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