#ceph IRC Log

Index

IRC Log for 2015-07-21

Timestamps are in GMT/BST.

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[3:30] <snakamoto> I'm building my first cluster where the journals and OSDs are separate drives
[3:30] * fam is now known as fam_away
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[3:31] <snakamoto> when I do a ceph-disk list, the journal partitions just show up as "other, <uuid>"
[3:31] * cholcombe (~chris@c-73-180-29-35.hsd1.or.comcast.net) Quit (Ping timeout: 480 seconds)
[3:31] <snakamoto> "/dev/sdb :"
[3:31] <snakamoto> " /dev/sdb1 other, 0fc63daf-8483-4772-8e79-3d69d8477de4"
[3:31] <snakamoto> " /dev/sdb2 other, 0fc63daf-8483-4772-8e79-3d69d8477de4"
[3:32] <snakamoto> I partitioned the journal drive just using parted
[3:32] <snakamoto> anyone familiar with this?
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[3:38] <snakamoto> I just looked at https://en.wikipedia.org/wiki/GUID_Partition_Table
[3:39] <snakamoto> Ceph has its own UUID for GPT. Looking in my /dev/disk/by-parttypeuuid/, I see that the OSD drives have the correct Ceph OSD UUID parttype assigned to them
[3:39] <snakamoto> but my journal partitions only have the default linux fs data UUID
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[3:48] <snakamoto> Cool, I think I've resolved it. I used the gdisk utility on /dev/sdb, then set the type to GUID '45B0969E-9B03-4F30-B4C6-B4B80CEFF106' for both journal partitions.
[3:48] <snakamoto> wrote the changes then rebooted the server
[3:49] <snakamoto> I'm just going to start rubber ducking all my problems here =D
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[3:55] <doppelgrau> :)
[3:55] <doppelgrau> sgdisk is handy for changing UUDIs
[3:56] <snakamoto> do you know if there is a way to set that with parted so I can do it at creation?
[3:56] <doppelgrau> snakamoto: paste you a bash-Skript I use as ansible module in a query, might help you
[3:57] <snakamoto> ohhh sgdisk is a commandline version of gdisk
[3:57] <doppelgrau> snakamoto: no, i make it afterwards, use the UUID to detect if converted or not
[3:57] <snakamoto> that works =D thank you!
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[9:24] <Be-El> hi
[9:24] <T1w> mornings
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[12:57] <freman> hi! I get HEALTH_WARN too few PGs per OSD (10 < min 30)
[12:57] <freman> when I check ceph health, any one have an idea?
[13:02] <freman> Nevermind, found the correct syntax in the document
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[13:23] <freman> Hey, can some one answer the question on why ceph reads dont show in iotop or nmon on the ceph nodes?
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[16:33] <adrian15b> I want to be able to schedule deep scrub on non working hours. Is there anything more updated or more builtin into current ceph than: http://prob6.com/en/ceph-pg-deep-scrub-cron/ ? Thank you.
[16:34] <doppelgrau> adrian15b: updated version https://www.formann.de/2015/05/cronjob-to-enable-timed-deep-scrubbing-in-a-ceph-cluster/
[16:34] <doppelgrau> adrian15b: or ???ceph osd set nodeep-scrub???
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[16:36] <adrian15b> doppelgrau: Well, I prefer to run the deep-scrub. It seems it is recommended.
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[16:36] <doppelgrau> adrian15b: but I prefer the script, limits the total number of deep scrub at a lower value
[16:37] <adrian15b> doppelgrau: Sorry to mislead you. I also prefer the script.
[16:37] <adrian15b> doppelgrau: My doubt is about the default deep-scrub, as per reading the first article, it seems that ceph itself will try to run the deep-scrub each 4 weeks, isn't it ?
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[16:38] <doppelgrau> adrian15b: default once a week deep scrub
[16:38] <adrian15b> Or is it 4 weeks from last run (then I don't have to worry about it?) ?
[16:38] <doppelgrau> adrian15b: but you can change that value
[16:39] <adrian15b> doppelgrau: If you check my first linked article you will see that the default value is changed into 4 weeks.
[16:39] <doppelgrau> adrian15b: and for the script you increase the value to a number larger than the schedules time
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[16:39] <doppelgrau> so the script has enough time (and usually with a bit spar time, so you can skip one or two days with high IO maintenance without going to automatic deep scrubs)
[16:40] <adrian15b> Well, let's see if I can ask my question in another way.
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[16:40] <doppelgrau> adrian15b: I seet the time to 12,5 days, with the script scrubbing 10% each night => 2 nights spare
[16:41] <adrian15b> If I run the script in the cron, does it somehow disable the default once per week (or changed once per 4 weeks) ceph deep scrub check ? Or will it be performed anyway ? Hope my question is clear.
[16:41] <doppelgrau> I see
[16:42] <doppelgrau> ceph checks at each normal scrub if the last deep-scrub is longer than osd deep scrub interval seconds ago
[16:43] <doppelgrau> so if you manually deep-scrub a pg before osd deep scrub interval can hit, it???s effectivly disabled, and only a fallbackif the script does not run a long time
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[16:44] <adrian15b> Great. I guess that the way of "manually deep-scrub a pg" it's to use the script. Thank you for clarifying it. The first article was not clear enough. And, well, the second article, did not mention it.
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[16:45] <doppelgrau> adrian15b: perhaps I should write a second post in addition to the updated script :)
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[16:49] <adrian15b> I still have a question related to this.
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[16:52] <jvilla> Hey guys! I???m new to the Ceph community. I???ve been drinking from a hose for two days now. Have an excellent proof-of-concept set up for a project I am working on, but I have on issue and I thought i???d ask you guys.
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[16:53] <adrian15b> 1) You say that in your case your cron just scrubbs 10% each night. How do you know that it's 10% ?
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[16:54] <doppelgrau> adrian15b: the script counts the number of PGs and deep-scrubs the oldest n-percent
[16:54] <adrian15b> 2) How do you know how long does the deep-scrub job will take ? The script does not limit how long it takes to do the deep-scrub, isn't it ?
[16:55] <doppelgrau> adrian15b: that might not be exactly n-percent of the data, but on average that???s ok
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[16:57] <doppelgrau> adrian15b: no, it takes untill it???s finished. But in my experience the time varies only a bit, so no problem there if you calculate with a small safety margin. The time it takes depends of the number of PGs and of course the amount of data scrubbed. But to speed things up you can increase the number of parallel scrubs
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[16:57] <adrian15b> doppelgrau: So, let me see if this is ok, if I use the default workratio=7 and I have 512 pgs then it means each night it will deep-scrub: 512 / 8 = 64 pgs. Isn't it ?
[16:58] <doppelgrau> adrian15b: 512/7 =>74 PGs
[16:59] <adrian15b> pgwork=$((pgcnt / workratio + 1))
[16:59] <adrian15b> :)
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[17:00] <doppelgrau> adrian15b: 73 + 1 ;)
[17:00] <doppelgrau> jvilla: simply ask, if someone has an idea, you can get a response
[17:00] <s3an2> jvilla: Hey, please state your problem and if someone here can help they will.
[17:01] <adrian15b> doppelgrau: Wouldn't it be: 512 / (7 + 1) ? Or am I misreading the code ?
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[17:03] <doppelgrau> adrian15b: you???re inserting brackets where are no => normal math rules apply, first division and multiplication, then addition
[17:04] <adrian15b> doppelgrau: Wait a moment ! You are right !
[17:04] <adrian15b> doppelgrau: I guess the double (( has tricked my mind into thinking that workratio + 1 was inside a parenthesis.
[17:05] <adrian15b> doppelgrau: Finally I'm going to implement your newest script in Hammer. I guess that it should work ok in that Ceph version, isn't it ?
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[17:07] <doppelgrau> adrian15b: yes, works for me with 0.94.2 => hammer
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[17:09] <adrian15b> doppelgrau: Thank you very much for all of your help. I'm going to implement this into our system so that we don't get I/O surprises.
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[17:25] <atmark> Hello, would OSD reweight trigger rebalancing?
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[17:26] <doppelgrau> atmark: yes, some PGs must be moved afterwards
[17:27] <atmark> doppelgrau: Cool, thanks!
[17:29] <doppelgrau> atmark: you can even simulate what would happen somehow, but never tried thar
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[17:31] <atmark> doppelgrau: how would I simulate it? sorry for my ignorance
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[17:32] <zenpac> Is there any documentation that talks about setting up multiple-clusters?
[17:33] <doppelgrau> atmark: never tried, I think it was using osdmaptool and crushtool
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[17:35] <atmark> doppelgrau: i'll look into that. thanks
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[18:10] <zenpac> Is there any ceph command that displays the configuration file for a cluster?
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[18:12] <theanalyst> zenpac: ceph daemon /path/to/mon/socket config show ?
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[18:17] <zenpac> theanalyst: thanks.. That shows the actual configuration. Looking for the path to the config file .
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[19:12] <adrian15b> doppelgrau: Hey!
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[19:12] <adrian15b> doppelgrau: The original script for scheduled deep scrub did have a check for setting up workratio to 7 if it was unset.
[19:13] <adrian15b> doppelgrau: In your new script these lines are not used at all because the "set -o nounset" option triggers the $1 not assigned variable error on line 22.
[19:14] <doppelgrau> adrian15b: you???re right. would need to ad an $# check to avoid that
[19:14] * doppelgrau had never testet it without parameters
[19:15] <TheSov> is it possible to move data between pools in the backround instead of using DD
[19:15] <TheSov> err rbd images not pools
[19:16] <doppelgrau> http://ceph.com/docs/master/man/8/rbd/ <- cp
[19:16] <adrian15b> doppelgrau: I have read your script / article and the old one and... I still have the same question ... What am I supposed to enter as the second argument ($2) ?
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[19:16] <doppelgrau> $2?
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[19:17] <adrian15b> doppelgrau: Yeah, deepScrubPg $1 $2 in the code. Do you use only one argument yourself ?
[19:17] <doppelgrau> only $1 is a script parameter, other are arguments of the included functions
[19:18] <adrian15b> doppelgrau: Let me re-read the script again. I might have overlooked one of the functions end
[19:18] <TheSov> doppelgrau, thanks
[19:19] <doppelgrau> adrian15b: between the [ "x$workratio" == x ] && workratio=7 and ???# Check if it should run on this monitor??? all code are functions
[19:19] <adrian15b> doppelgrau: I have re-read it. I have still the same question. Can you please take a look at the: deepScrubPg $1 $2 line ?
[19:20] <doppelgrau> adrian15b: the ???set $line??? command before sets them according to the output of ???getoldestScrubs???
[19:20] <adrian15b> doppelgrau: Ok, my deepScrubPg line is after that then.
[19:21] <adrian15b> What?!
[19:21] <adrian15b> This is a weird way of programming XD
[19:21] <adrian15b> Now it makes sense.
[19:22] <amatus> is there a ceph command that parses the config file and outputs the fsid?
[19:22] <doppelgrau> adrian15b: it is, bu I was to lazzy to change all that looks strange
[19:23] <doppelgrau> adrian15b: depending how you deploy the script, you might want to remove the check, that verifies that the script only runs on the first mon
[19:23] <adrian15b> Hummm,... I didn't see that.
[19:23] <doppelgrau> adrian15b: I put that in it, so my deployment is easier (simply on al mons, and if one fails it won???t matter, still runs)
[19:24] <adrian15b> So I guess that you deploy the script by default in all of the nodes and then being in the first mon triggers it or not.
[19:24] <doppelgrau> adrian15b: ???only??? on all mons
[19:24] <adrian15b> I might also deploy it in all of the mons. It's going to be a manual deployment but anyways.
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[19:25] <doppelgrau> adrian15b: I use ansible to deploy the cluster, so besides fault tolerance it was easier that way
[19:25] <adrian15b> Hummmm
[19:26] <adrian15b> That's a bug :).
[19:26] <adrian15b> doppelgrau: You should have docummented outside the script that new feature, specially, when you changed the old behaviour.
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[19:29] <doppelgrau> adrian15b: done :)
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[19:32] <adrian15b> I am wondering about the need of logging in non first monitor nodes... the message: "Not in the first monitor node. Doing nothing.". I guess it's not needed.
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[19:33] <amatus> found it: ceph-conf --lookup fsid
[19:34] <doppelgrau> adrian15b: the verbosity is allways a tradeoff, the original skript gives you half da douzen lines per PG, mine only a ???Start??? and ???finished??? entry in the syslog. ideal would be configurable, but I wasn???t paid to do that :)
[19:36] <adrian15b> doppelgrau: Yeah, I am not complaining. It's just that if a final user wants to test it from a non first monitor node it would think it does not work at all. And that makes me think if it's worth or not. Anyway,... now that I know about the first monitor it's fine for me.
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[19:40] <adrian15b> doppelgrau: Your first monitor detection is not working for me. http://paste.debian.net/284549/
[19:42] <doppelgrau> adrian15b: strange, ceph -s | /bin/fgrep -A1 " monmap e" | /usr/bin/tail -1 | /usr/bin/cut -d "," -f 2- | /usr/bin/cut -d " " -f 4 | /usr/bin/cut -d "," -f 1 returns not the name of the first mon?
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[19:43] <adrian15b> doppelgrau: Take a look at the ceph -s output: http://paste.debian.net/284551/
[19:43] <doppelgrau> adrian15b: oh, your mons only have numbers, not names
[19:44] <doppelgrau> didn???t know thats possible, I guess I just throw the first mon detection away on the webpage, just to many assumptions made
[19:45] <adrian15b> doppelgrau: Given that I can get a 0 (by trimming it). I might try to find the reverse of mon.0 somewhere
[19:46] <doppelgrau> adrian15b: my mons have the name mon.hostname
[19:49] <adrian15b> Hummm.... I guess I can extract the ip and somehow compare it to...
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[19:57] <adrian15b> ... to hostname --ip-address output.
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[20:02] <cholcombe> i seem to remember there's a ceph journal recovery tool. anyone know the link to that?
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[20:10] <adrian15b> doppelgrau: Here's my autodetection code draft: http://paste.debian.net/284556/ .Does it make sense. The first one will be always be 0: , isn't it ?
[20:11] <doppelgrau> adrian15b: looks reasonable.
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[20:19] <adrian15b> doppelgrau: Here's the final code: http://paste.debian.net/284559/
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[20:23] <adrian15b> doppelgrau: I have run your script manually in the right first node and I'm not sure if it's doing what it's supposed to do.
[20:24] <adrian15b> doppelgrau: This is what log says: http://paste.debian.net/284572/ and it was just one second to run.
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[20:28] <adrian15b> doppelgrau: Here's the debug bash transcript: http://paste.debian.net/284575/ . I'm not sure it it's the intended behaviour or not
[20:29] <doppelgrau> adrian15b: are your PGs not active+clean?
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[20:30] <adrian15b> doppelgrau: They are all active+clean if I'm not mistaken.
[20:31] <doppelgrau> adrian15b: or the output of ceph pg dump pgs differs, the function should return the oldest PGs
[20:31] <doppelgrau> and it returns nothing
[20:34] <adrian15b> doppelgrau: Ok, let me debug a bit
[20:36] <adrian15b> doppelgrau: It's: /^[0-9a-z]\.[0-9a-z]+/ which it's clearing the input data. Maybe something missing there while copying from actual script to the CMS ?
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[20:37] <adrian15b> What's the purpose of that RE anyway ?
[20:37] <doppelgrau> adrian15b: works for me: http://paste.debian.net/284576/
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[20:38] <doppelgrau> adrian15b: just took it from the original script, only changed the used collums
[20:39] <adrian15b> doppelgrau: Is that one number DOT several numbers ?
[20:40] <adrian15b> doppelgrau: Here's an excerpt of my ceph pg dump pgs .
[20:40] <adrian15b> doppelgrau: Here's an excerpt of my ceph pg dump pgs : http://paste.debian.net/284578/ .
[20:41] <doppelgrau> adrian15b: I see
[20:42] <doppelgrau> adrian15b: try /^[0-9]+\.[0-9a-z]+/
[20:43] <adrian15b> doppelgrau: I have tried : /^[0-9a-z]+\.[0-9a-z]+/ with success.
[20:43] <doppelgrau> or that :)
[20:43] <doppelgrau> seems noone had testet the script with more than 10 pools :)
[20:43] <adrian15b> doppelgrau: Is it better your proposal because the first letters before the initial dot are never going to have letters ?
[20:44] <doppelgrau> I think since a PG compromises out of pool-ID.number my is a bit more specific
[20:45] <adrian15b> Well, anyway
[20:45] <adrian15b> Going to test the script again and see what it gives.
[20:46] <doppelgrau> ceph -w somewhere is usually also intressting so see whats happening
[20:46] <adrian15b> Ok, now it seems to be a lot of work being done. Now I regret having set -x .... set -v, but well, I needed them for debug before.
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[20:49] <doppelgrau> adrian15b: thanks for the feedback
[20:49] <adrian15b> doppelgrau: Thank you for your help too!
[20:49] <adrian15b> I'm going to setup the crons and I'm done.
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[20:53] <adrian15b> doppelgrau: That's not right (your updated article).
[20:53] <adrian15b> doppelgrau: Did you remove on purpose the "Not first monitor" check and its explanation ?
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[20:54] <doppelgrau> adrian15b: yes, since that check replied on too many assumptions
[20:54] <doppelgrau> relied
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[20:55] <adrian15b> doppelgrau: Ok, the next time I will have to review my notes I'll check if there is any update on that particular matter.
[20:55] <doppelgrau> I also fixed the regex :)
[20:56] <adrian15b> doppelgrau: Yeah, I saw that.
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[21:02] <adrian15b> doppelgrau: By the way the reason why my pgs starts at 11 is because I kind of copied my old pool into a new pool, and then deleted the old pool. That's why.
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[21:03] <adrian15b> Crons implemented. Tomorrow I'll try to do some I/O tests to know maximum workload of the ceph system. :)
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[21:45] <cholcombe> ceph: in bobtail if you have pg's that are lost and the disks were destroyed how to you recover from that?
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[22:35] <cholcombe> should osd's be added in as a new ID if the disk fails?
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[22:37] <doppelgrau> cholcombe: I have always removed the faulty OSD before, often ceph deployed the same ID later (it recycles not more IDs)
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[22:37] <cholcombe> doppelgrau: ok
[22:38] <cholcombe> i have a few down+incomplete PG's and i think it's stemming from the ID's being the same as before
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[22:38] <doppelgrau> cholcombe: I use the steps described here to remove an OSD http://ceph.com/docs/master/rados/operations/add-or-rm-osds/
[22:39] <cholcombe> :)
[22:39] <doppelgrau> cholcombe: don???t know whtat happens if you recycle manually
[22:39] <cholcombe> oh i know the correct way to do it :)
[22:39] <doppelgrau> ok
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[22:47] <cholcombe> will ceph-objectstore-tool work for bobtail? :D ???
[22:48] <cholcombe> https://github.com/ceph/ceph/pull/5031
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[22:55] <cholcombe> does ceph pg dump show what pools the PG's are in?
[22:57] <doppelgrau> yes, the part before the dot is the pool number
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[23:07] <cholcombe> oh cool thanks
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[23:18] <davidz> cholcombe: No, ceph-objectstore-tool doesn't run in bobtail. Firefly has backports of many of the most current features.
[23:18] <cholcombe> ok cool
[23:18] <cholcombe> i figured. bobtail is end of life right?
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[23:22] <m0zes> so, I think I think I found a bug related to cephfs, ec pools, and adding a new data pool.
[23:22] <m0zes> ceph mds add_data_pool archive
[23:22] <m0zes> Error EINVAL: can't use pool 'archive' as it's an erasure-code pool
[23:23] <m0zes> but you *can* create a new cephfs with an ec pool that has a caching tier.
[23:23] <doppelgrau> m0zes: it???s not a bug
[23:23] <m0zes> archive does have a caching tier in this cas.
[23:23] <m0zes> s/cas./case.
[23:23] <doppelgrau> the caching tier makes sure only full objects are written
[23:24] <m0zes> right. which is why archive has a caching tier.
[23:24] <m0zes> and when creating the cephfs, you specify the ec pool when it has a caching tier above it.
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[23:29] <doppelgrau> ok, so ceph mds newfs works, but add_data_pool doesn???t? You???re right, doesn not make sense
[23:29] <cholcombe> doppelgrau: the metadata pool is created only for cephfs right?
[23:30] <doppelgrau> cholcombe: I???m not exactly sure if it???s technically required, but setting up two pools for cephfs (one for metadata, one for data) is at least best practise
[23:31] <doppelgrau> cholcombe: ceph mds newfs expects two pools as parameters ???
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[23:32] <cholcombe> doppelgrau: ok that's what i thought
[23:34] * CheKoLyN (~saguilar@bender.parc.xerox.com) has joined #ceph
[23:37] * reed (~reed@75-104-70-4.mobility.exede.net) has joined #ceph
[23:41] * Nats_ (~natscogs@114.31.195.238) Quit (Read error: Connection reset by peer)
[23:41] * Nats_ (~natscogs@114.31.195.238) has joined #ceph
[23:44] <jcsp> add_data_pool is indeed not doing the check correctly. created http://tracker.ceph.com/issues/12426
[23:44] <jcsp> ^m0zes
[23:44] * linjan (~linjan@176.195.70.29) Quit (Ping timeout: 480 seconds)

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