#ceph IRC Log

Index

IRC Log for 2015-12-20

Timestamps are in GMT/BST.

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[0:08] <monsted> i was thinking you could create a small partition on each drive with the basic info needed to get it back in the cluster
[0:09] <monsted> or use labels.
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[0:20] <rkeene> monsted, I use the labels
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[6:11] <mnaser> Uh, I'm getting: "too few PGs per OSD (16 < min 30)" .. trying to increase pg_num to 4096 (12 osds on this small test cluster) .. "Error E2BIG: specified pg_num 4096 is too large (creating 4032 new PGs on ~12 OSDs exceeds per-OSD max of 32)"
[6:11] <mnaser> i haven't had luck at finding how to change the per-osd max?
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[6:41] <jidar> you need to grown the number of PGs in smaller increments
[6:41] <jidar> at least that's what somebody said a few days ago
[6:41] <jidar> haven't tried it myself
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[13:11] <fen> hello :)
[13:13] <Kvisle> TheSov: I'm glad you like my blog post :) (ref. http://redpill-linpro.com/sysadvent/2015/12/18/stateless-osd-servers.html)
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[13:28] <MACscr> grr, somehow my ceph cluster is even worse shape after i recovered it. lol http://pastie.org/pastes/10642905/text
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[13:38] <MACscr> rkeene: sounds like im doing something close to what you are doing
[13:38] <MACscr> are you using iscsi for the root booting?
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[14:10] <MACscr> ok, something weird is going on. no idea why 4 of my 6 osd's are down
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[14:37] <MACscr> ok, only 2 down now, but i have no idea why
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[14:59] * gregsfortytwo (~gregsfort@transit-86-181-132-209.redhat.com) Quit (Read error: Connection reset by peer)
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[15:02] <MACscr> well luckily '/etc/init.d/ceph restart osd' did the trick
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[15:27] <fen> do i need to have one mon keyring for all the mon instances or is there one mon keyring for every mon instance?
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[15:51] <fen> what does this mean: Error EINVAL: key for client.admin exists but cap mds does not match
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[16:04] <fen> ok i found it
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[20:20] <rkeene> MACscr, No -- PXE loads an initramfs and the whole system runs from there
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[20:21] <MACscr> rkeene: i really want to do the same, but my cluster (including ceph) is proxmox based and I just dont think it would play well with that setup because of the persistency of some data on reboots, etc
[20:22] <rkeene> That's one of the reasons I maintain my own distribution just for this (the other is small size and atomic upgrades)
[20:22] <MACscr> doing anything special with logging besides just a central rsyslog server?
[20:22] <rkeene> Yes
[20:23] <rkeene> I wrote my own syslogd, which logs to an SQLite3 DB, and then a central node periodically comes around and, in an SQL transaction, scoops up new messages and stores it in a central SQLite3 DB -- then you can configure that DB to be sent via syslog to a central syslog server
[20:23] * bvi_ (~bastiaan@152-64-132-5.ftth.glasoperator.nl) Quit (Quit: Ex-Chat)
[20:24] <MACscr> lol, nice
[20:24] <rkeene> http://aurae.coreadaptive.com/artifact/123ad930971710555cb3e73e57e054bdbc451780
[20:24] <rkeene> That way it's asyncronous and you're not just hoping the remote server collects the logs
[20:24] <rkeene> And it's atomic/transactioned
[20:25] <rkeene> http://aurae.coreadaptive.com/artifact/b06a1107bec5a6bf5970017194416b1cf63f5055 sends the logs to the remote syslog server
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[20:25] <rkeene> http://aurae.coreadaptive.com/artifact/123ad930971710555cb3e73e57e054bdbc451780 collects other log files that aren't being sent to syslog and shoves them into syslog, rotating as needed
[20:26] <rkeene> (That way you only have to care about syslog data)
[20:26] <MACscr> great work
[20:26] <rkeene> http://aurae.coreadaptive.com/artifact/aaf0dd8c5c5f94ad49866ce80d91adff3f704c08 is the syslogd, it writes to a flat text file (that it rotates and deletes) as well as an SQLite3 DB
[20:27] <rkeene> I put a LOT of thought into every aspect of the system :-D
[20:27] <MACscr> im the same way, i just dont have the technical knowhow to implement all the ideas =P
[20:28] <rkeene> Well certainly if you have any ideas I can implement them in my distribution
[20:29] <rkeene> What kind of ideas do you have ?
[20:33] <hoonetorg> hi i recently found some websites reporting scaleio is thaaat faster than ceph
[20:34] <hoonetorg> but afaiu the tests were made by scaleio guys
[20:35] <hoonetorg> so i don't trust what they tested
[20:35] <hoonetorg> what do ceph guys say about that wonder scaleio.
[20:36] <hoonetorg> is there a test made by ceph guys which compared ceph against scaleio
[20:36] <hoonetorg> ???
[20:36] <rkeene> It's harder since ScaleIO is proprietary (AFAIK)
[20:37] <hoonetorg> don't get me wrong i have 4 ceph clusters (hybrid ssd journal + rotating osd drives) and i'm absolutely happy with it and will stay with it
[20:38] <hoonetorg> but i only wanted to know if that is true?
[20:39] <hoonetorg> rkeene: you mean it's not allowed to make performance comparison of ceph and scaleio?
[20:40] <hoonetorg> like others that have forbidden to make performance comparisons against their products (vmware or nutanix or who it was).
[20:43] <rkeene> I mean someone would have to purchase ScaleIO licenses to do the comparison
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[21:01] <hoonetorg> it's free to download/install/use for non-commercial
[21:01] <hoonetorg> so a performance comparison against is afaik non-commercial
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[21:02] <hoonetorg> if i had more time, i would try on my personal hardware
[21:02] <hoonetorg> i've seen a video where they configured everything over a gui (wwwhuuuuaaa gaaaahhh)
[21:03] <hoonetorg> i install ceph via saltstack
[21:03] <hoonetorg> must be nice to create 1000 mon and storage nodes on a scaleio storage via a webgui
[21:04] <hoonetorg> i also read somewhere that (pendant-to-)monitoring nodes in scaleio is not really high available
[21:04] <rkeene> It likely that the GUI isn't the only interface
[21:05] <hoonetorg> rkeene: probably, yeah
[21:05] <hoonetorg> and read that caching could not be enabled for ssd's
[21:05] <hoonetorg> (wasn't it here :) )
[21:07] <hoonetorg> but the guy on the promo video said on the other hand: performance and latency virtual drives on a hypervisor is very important
[21:07] <hoonetorg> that is true
[21:08] <hoonetorg> and if scaleio is really that fast ?!?
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[21:09] <hoonetorg> ... then ceph has potential to become much faster as it is now
[21:12] <hoonetorg> .... and if ceph guys / sage finds the magic button to speed ceph (again) up in that way - halleluja
[21:12] <rkeene> I've looked into speeding up where Ceph is slow for us and it's a lot of work (make the journal locking less tragic)
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[21:13] <hoonetorg> rkeene: are you in dev team?
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[21:14] <rkeene> We sell a Ceph-based appliance, and I do development on it
[21:15] <hoonetorg> i really don't have enough knowledge about ceph internals to say anything useful about performance improvements
[21:17] <hoonetorg> rkeene: thx for conversation
[21:19] <hoonetorg> rkeene: what is website of the appliance? it's not on rkeene.org. is there some info about it?
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[21:21] <rkeene> rkeene.org is my personal web page, knightpoint.com is the company I work for... There's some info about it, "CloudSeed", but not a lot right now
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[21:28] <hoonetorg> rkeene: thx
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[21:40] <MACscr> rkeene: im guessing you do not offer web design services?
[21:40] <MACscr> =P
[21:40] <MACscr> just messin with ya
[21:40] <rkeene> MACscr, No, we don't even design our on website -- we paid someone to do that
[21:40] <rkeene> on -> own
[21:41] <MACscr> i was talking about your personal site and just poking ya in the ribs
[21:41] <rkeene> Oh, my website was designed by me and it's awesome :-D
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