#ceph IRC Log

Index

IRC Log for 2016-04-26

Timestamps are in GMT/BST.

[0:02] * garphy is now known as garphy`aw
[0:07] * haomaiwang (~haomaiwan@109.sub-70-195-209.myvzw.com) has joined #ceph
[0:07] * vata (~vata@cable-21.246.173-197.electronicbox.net) has joined #ceph
[0:07] * cryptk (~Da_Pineap@4MJAAEF9K.tor-irc.dnsbl.oftc.net) Quit ()
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[0:30] * DV (~veillard@2001:41d0:a:f29f::1) Quit (Remote host closed the connection)
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[0:45] * fsimonce (~simon@host201-70-dynamic.26-79-r.retail.telecomitalia.it) Quit (Quit: Coyote finally caught me)
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[0:56] * theanalyst (theanalyst@open.source.rocks.my.socks.firrre.com) Quit (Ping timeout: 480 seconds)
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[1:09] * allaok (~allaok@ARennes-658-1-103-68.w83-199.abo.wanadoo.fr) Quit (Remote host closed the connection)
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[1:12] * adept256 (~uhtr5r@7V7AAD7ER.tor-irc.dnsbl.oftc.net) Quit ()
[1:16] * haomaiwang (~haomaiwan@109.sub-70-195-209.myvzw.com) has joined #ceph
[1:16] * rendar (~I@host83-179-dynamic.27-79-r.retail.telecomitalia.it) Quit (Quit: std::lower_bound + std::less_equal *works* with a vector without duplicates!)
[1:19] * sudocat (~dibarra@2605:b400:104:11:11d5:8a2:3e32:ef29) Quit (Ping timeout: 480 seconds)
[1:21] * tunaaja (~ulterior@06SAABO6E.tor-irc.dnsbl.oftc.net) has joined #ceph
[1:22] * Lea (~LeaChim@host86-147-224-166.range86-147.btcentralplus.com) Quit (Ping timeout: 480 seconds)
[1:24] * haomaiwang (~haomaiwan@109.sub-70-195-209.myvzw.com) Quit (Ping timeout: 480 seconds)
[1:30] * billwebb (~billwebb@50-203-47-138-static.hfc.comcastbusiness.net) Quit (Quit: billwebb)
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[1:49] * Nacer (~Nacer@101.53.18.178) Quit (Remote host closed the connection)
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[2:04] * dsl (~dsl@72-48-250-184.dyn.grandenetworks.net) has joined #ceph
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[2:07] * haomaiwang (~haomaiwan@207.91.176.135) Quit (Read error: Connection reset by peer)
[2:07] * xolotl (~zc00gii@marylou.nos-oignons.net) has joined #ceph
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[2:37] * xolotl (~zc00gii@4MJAAEGCF.tor-irc.dnsbl.oftc.net) Quit ()
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[2:40] * _{Tite}_ (~oftc-webi@209-6-251-36.c3-0.wrx-ubr1.sbo-wrx.ma.cable.rcn.com) Quit (Ping timeout: 480 seconds)
[2:40] * clayb (~clayb@acehotel215.a.subnet.rcn.com) Quit (Read error: Connection reset by peer)
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[2:51] * ChauffeR1 (~rhonabwy@6AGAABCGF.tor-irc.dnsbl.oftc.net) Quit ()
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[2:54] * ira (~ira@c-24-34-255-34.hsd1.ma.comcast.net) Quit (Quit: Leaving)
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[3:00] * brians_ (~brian@80.111.114.175) Quit (Read error: Connection reset by peer)
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[3:07] * Zeis (~dusti@6AGAABCG3.tor-irc.dnsbl.oftc.net) Quit ()
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[3:12] <huangjun> [19:44:12.003298294] (+0.000004385) server8 librbd:write_exit: { cpu_id = 11 }, { pthread_id = 140478959601408 }, { retval = 4096 }
[3:12] * haomaiwang (~haomaiwan@246.sub-70-195-199.myvzw.com) has joined #ceph
[3:12] <huangjun> what does (+0.000004385) mean in lttng log?
[3:13] * clayb (~clayb@acehotel215.a.subnet.rcn.com) Quit (Ping timeout: 480 seconds)
[3:15] * wwdillingham (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) has joined #ceph
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[4:16] * wwdillingham (~LobsterRo@209-6-222-74.c3-0.hdp-ubr1.sbo-hdp.ma.cable.rcn.com) Quit (Quit: wwdillingham)
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[6:35] <hemebond1> Can someone please point me to a guide on setting up a very basic single-node cluster with ceph-deploy?
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[7:19] <nils_> am I right to assume that the debian packages are now being built without a memory allocator like tcmalloc/jemalloc, which would allow me to LD_PRELOAD the one I want?
[7:19] <nils_> for Jewel that is
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[14:26] <boolman> can I expect to see any difference in performance by enabling rbd mirroring / journaling ?
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[14:38] <Gugge-47527> boolman: yes
[14:38] <Gugge-47527> but if its enough to notice, i dont know :)
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[15:03] <sep> i am cep osd out osd.9 since it's showing smart errors. what is the correct way to see if it's done ? can i use ceph pg ls-by-osd and expect an empty list?
[15:04] <bniver> I forgot to click
[15:04] <bniver> join
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[15:32] <brad[]> Hi all, are any of you using Samsung PM863 drives as part of either a cache tier or a ceph pool proper? Or is the performance tradeoff just too great in your opinion?
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[15:34] <darkfader> Heebie: i had some spare time, you win :-) https://deranfangvomende.wordpress.com/2016/04/26/ceph-training-overview/
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[15:37] <Heebie> I WIN!!!! =D (What do I win?)
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[15:42] <Heebie> OOH Free training (informational URL's) Woohooo! Thanks. darkfader.
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[15:48] <darkfader> Heebie: i think if you do another search and speak another language you'll find a few more i didn't but you can compare the contents
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[15:48] <Heebie> Igpe Atinle?
[15:48] <darkfader> it was quite fun to research, a lot more offers now
[15:49] <darkfader> err ?WHAT? :)\
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[15:51] <Heebie> igpay atinlay?
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[15:58] <sep> darkfader, nice write :) well done
[15:58] <darkfader> Heebie: i had to google that, just why! no i don't think that's a common training language
[15:58] <Heebie> (pig latin... you take the first letter of each word, put it after the last letter and add an "e" with the "ay" sound like in the word "say") Silly language. :)
[15:59] <darkfader> sep: thanks
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[17:25] <monsted> fresh storage porn from backblaze: https://www.backblaze.com/blog/open-source-data-storage-server/
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[17:57] <Tetard> nam
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[18:08] <beat8> Hi guys! Any idea why osd-daemons takes all available RAM on node. Server become unavailable with out of memory issue. Config is 16gb RAM/ 22x3tb node. When it's 10% full it became unstable. and it's not on rebalancing mode
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[18:14] <nhm> beat8: you don't have enough memory to support 22 OSDs per node.
[18:15] <nhm> beat8: you might be able to survive steady-state, but under recovery and potentially under heavy write workloads you may run out.
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[18:15] <m0zes> 1-1.5GB/osd is normal usage
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[18:16] <beat8> i know, any chance to decrease ram size in settings for not heavy loads? I've read CERN publication about their ceph usage and they had less ram per osd-daemon
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[18:17] <m0zes> the best way to keep memory usage low is to use fewer pgs per osd. but that leads to data imbalance.
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[18:19] <nhm> beat8: you can also reduce the tcmalloc thread cache size. pre-jewel it's 32MB. Now it's 128MB. Higher thread cache means better performance and lower CPU usage on SSDs at the cost of more memory usage.
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[18:21] <nils_> is tcmalloc still the default allocator?
[18:22] <beat8> osd heap stats shows that 90% of memory used by "Bytes in use by application"
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[18:55] <nhm> nils_: yes, we debated switching to jemalloc for a while, but ultimately decided to just increase the tcmalloc threadcache size.
[18:56] <nhm> nils_: it would have been more work to switch and there was some concern about the lack of testing on jemalloc so far.
[18:56] <nhm> nils_: might still happen some day, but for now having people use the newer tcmalloc and setting a larger threadcache gets most of the advantages and still seems to use a bit less memory than jemalloc.
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[18:59] <nils_> nhm, I think jemalloc also has some issues with transparent hugepages
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[19:08] <lifeboy> I cannot use "osd prepare" to create a new OSD... running Hammer on Debian Jessie. Could it be a bug through a regression maybe? Details of error at http://pastebin.com/9CcafbJD
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[19:09] <lifeboy> Sorry, not Hammer, ceph version 9.2.1
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[19:12] <lifeboy> I have zapped, manually deleted and cleaned the disk, but the problem doesn't go away. If I manually format the disk with xfs, it only creates a single partition without a journal, so that doesn't work for me :-(
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[19:13] <lifeboy> Seems this is specific to Debian Jessie, since this was not a problem with Firefly and Debian 7 Wheezy
[19:14] <lifeboy> on the same disk...
[19:14] <lifeboy> 2 different machines, same problem
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[19:17] <doppelgrau> lifeboy: why do you pass the whole disk as an argument and later a partition
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[19:17] <doppelgrau> lifeboy: IIRC it needed to be two partitions if using same disk for both
[19:18] <lifeboy> <doppelgrau> regardless of whether I use sdb or sdb1, I get the same error
[19:18] <doppelgrau> lifeboy: different
[19:19] <lifeboy> I started by using a "ceph-deploy create", then "ceph prepare", but they both give the same error. Then I went to the commands that these two call, but no difference.
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[19:20] <doppelgrau> create two partitons by hand (empty) and try again
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[19:22] <lifeboy> I suppose I could do that, but I can't find a reference as to how big each partition should be. Furthermore, the whole point of ceph-disk prepare is to not have to do this manually, not?
[19:24] <doppelgrau> prepare IIRC assumes partitions exists: http://docs.ceph.com/docs/hammer/man/8/ceph-disk/
[19:24] <doppelgrau> => data-path and journal path
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[19:27] <lifeboy> doppelgrau: But ceph-deploy does create this with gsdisk as far as I can see.
[19:27] <doppelgrau> both?
[19:28] <lifeboy> s/gsdisk/sgdisk
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[19:28] <lifeboy> yes. It does "/sbin/sgdisk --largest-new=1 --change-name=1:ceph data --partition-guid=1:af45be57-8955-4afc-a6c3-f60271f4b4d1 --typecode=1:89c57f98-2fe5-4dc0-89c1-f3ad0ceff2be -- /dev/sdb"
[19:29] <lifeboy> then after that the mkfs.xfs fails
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[19:31] <doppelgrau> and the second partition for the journal?
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[19:36] * doppelgrau is still betting that you ty to use the whole disk and a partition on the same disk => fail guaranteed
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[19:37] <Heebie> I had one where I accidentally set the same partition as a journal for two different OSD's. That was entertaining!
[19:37] <lifeboy> doppelgrau: Here the result with all the output http://pastebin.com/GfsPPBWg
[19:39] <doppelgrau> show a partitiontable before & after
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[19:48] <lifeboy> doppelgrau: whichever way, it doesn't work. Here's the partition table and results http://pastebin.com/ZV2Bufcs
[19:49] <lifeboy> the final attempt creates the partitiontable correctly, but the script still doesn't complete
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[19:51] <lifeboy> Even though I specified just sdb to prepare, it see that "/sbin/mkfs -t xfs -f -i size=2048 -- /dev/sdb1 [s2][WARNIN] can't get size of data subvolume"
[19:52] <doppelgrau> and exact the same command works on the command line?
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[19:53] <lifeboy> No, it doesn't work, it gives the same error
[19:53] <lifeboy> # /sbin/mkfs -t xfs -f -i size=2048 /dev/sdb1
[19:53] <lifeboy> can't get size of data subvolume
[19:55] <doppelgrau> so you narrowed it down to an incompatible option set
[19:55] <lifeboy> If I drop the 1 from the mkfs line, the partitions are deleted and a single partition is created
[19:56] <lifeboy> doppelgrau: Incompatible option set? It seems to me that mkfs.xfs doesn't succeed in formatting which ever way one specifies, unless theres some advanced option that I can't figure out
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[20:01] <doppelgrau> lifeboy: so you have an mkfs that fails to format a partition :D
[20:01] <lifeboy> the man page says the one should just specify: ceph-deploy disk prepare [HOST:[DISK]]
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[20:03] <lifeboy> doppelgrau: Or seen from a different angle: I have ceph-deploy that doesn't specify the correct parameters on Debian Jessie (and elsewhere?) to format a XFS disk...
[20:05] <doppelgrau> those options are listed in the man page => should work
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[20:17] <lifeboy> doppelgrau: which options in which man page? the ceph-disk man page doesn't have much more on disks
[20:17] <doppelgrau> mkfs.xfs / mkfs
[20:19] <lifeboy> doppelgrau: Then this is a bug in ceph-disk, not?
[20:20] <doppelgrau> why should it? it passes valid options
[20:23] <doppelgrau> ceph-disk prepare --cluster-uuid $clusterId --data-dev --journal-dev $dataDisk $journalDisk
[20:23] <doppelgrau> I use that in a ansible library and it simply works fine
[20:24] <doppelgrau> but I had the partitions created before and the typcodes set
[20:24] <doppelgrau> but no truble mit mkfs, and yes, debian jessie
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[20:32] <lifeboy> doppelgrau: So what does one use for $dataDisk and $journalDisk? The device (sda) or the partition (sda1 / sda2)?
[20:32] <doppelgrau> partitions
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[20:33] <lifeboy> ceph-disk: error: unrecognized arguments: /dev/sdb1 /dev/sdb2
[20:33] <lifeboy> ceph-disk: error: unrecognized arguments: sdb1 sdb2
[20:34] <lifeboy> I don't understand why this doesn't work for me ...
[20:36] <lifeboy> Also, I have used this many times pre-hammer / pre-jessie and it worked. Now it doesn't and if I don't use the command correctly, then it should be relatively clear what I'm doing wrong, but this is not the case.
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[20:53] <PoRNo-MoRoZ> how can i force to run osd's as root ? infernalis release
[20:53] <PoRNo-MoRoZ> new osds also
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[20:57] <lifeboy> doppelgrau: So what do I do now? What is the solution? I can't use the tools provided by ceph and I can't use mkfs.xfs either.
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[20:59] <doppelgrau> lifeboy: I would start with wiping the whole system and a clean install to narrow the possible reasons
[20:59] <lifeboy> I have done that twice already. :(
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[21:00] <lifeboy> It will become a proxmox node in future as well, so I suppose I could try without installing from the proxmox dvd?
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[21:26] <PoRNo-MoRoZ> guys
[21:26] <PoRNo-MoRoZ> i have a problem
[21:26] <PoRNo-MoRoZ> i got node with hanged mkfs
[21:26] <PoRNo-MoRoZ> and it eats memory
[21:26] <PoRNo-MoRoZ> cluster rebalancing
[21:26] <PoRNo-MoRoZ> what's my best option ?
[21:26] <PoRNo-MoRoZ> i can't kill it
[21:26] <PoRNo-MoRoZ> even with -9
[21:28] <PoRNo-MoRoZ> looks like false alarm
[21:29] <PoRNo-MoRoZ> based on top memory not eated by that hanged process
[21:29] <xcezzz> probably got a bunch of drive errors in dmesg
[21:29] <PoRNo-MoRoZ> but 'avail memory %' metric lowering since process hangs
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[21:30] <PoRNo-MoRoZ> nope, nothing unusual
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[21:30] <xcezzz> whats ur iowait at
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[21:32] <PoRNo-MoRoZ> about 50%
[21:33] <PoRNo-MoRoZ> but not since hanging mkfs
[21:33] <PoRNo-MoRoZ> rebalance stuff
[21:33] <PoRNo-MoRoZ> it was about 16-17%
[21:33] <xcezzz> well what does iostat show the wait queue size for the drive u mkfsing
[21:33] <xcezzz> iostat -xtm 2 devname
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[21:34] <PoRNo-MoRoZ> zeroes
[21:34] <PoRNo-MoRoZ> looks like i didn't fully loaded xfs.ko
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[21:34] <xcezzz> shouldnt matter unless your trying to mount it
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[21:47] <Kupo1> Hey all, have a weird issue: 'rbd diff' is reporting a VM disk size at 49,345MB however mounting and df'ing the data shows 24gb
[21:47] <Kupo1> Any think I can do to get accurate data usage?
[21:47] <xcezzz> run a trim on the image
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[21:48] <Kupo1> Thats after running a fstrim after mounting as well
[21:48] <Kupo1> mount, fstrim, unmount, unmap rbd. still shows that 'rbd diff' size
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[21:49] <xcezzz> ahh well a trim still won???t necessarily free up ALL free space on a disk
[21:49] <PoRNo-MoRoZ> [22:34:55] <xcezzz> shouldnt matter unless your trying to mount it
[21:49] <xcezzz> depending on data fragmentation??? sometimes you can lower the barrier to make it trim more but im not sure the best way
[21:49] <PoRNo-MoRoZ> look's like ceph-deploy used it ><
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[21:51] <xcezzz> well yes it does use it when it will start to mount it
[21:51] <xcezzz> a straight up mkfs.xfs /devname doesn???t need the xfs module loaded
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[21:52] <Kupo1> Whats even more strange is it seems whever i unmap/map/remount/fstrim it trims the same space
[21:52] <Kupo1> https://pastebin.mozilla.org/8868925
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[21:52] <xcezzz> Kupo1: well ya it will always seem to report the same size trimmed regardless of the amount of free space
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[21:55] <xcezzz> im actually trimming an image right now??? its a 16TB xfs??? with 3 replica??? even though 11TB is free now.. it is still using around 30TB of storage
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[21:57] <Kupo1> Does 'rbd diff' take account replicas?
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[21:57] <Kupo1> Maybe thats my problem
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[22:31] <xcezzz> Kupo1: good question
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[22:47] <Kupo1> Can any ceph guys confirm weither or not rbd diff is affected by replica counts?
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[23:02] <TMM> Does anyone know if it is possible to reduce the osd timeout? What seems to happen is that when a pg master comes back the requests pile up on the recovering node
[23:02] <TMM> and I get slow requests on the cluster for those osds
[23:02] <TMM> Maybe timeouts isn't the right description of the problem
[23:02] <TMM> :)
[23:02] <xcezzz> you mean ayou mean increase the timeout?
[23:03] <TMM> yeah, let me start over
[23:03] <xcezzz> or the ???slow request??? time?
[23:03] <TMM> I'm was conflating my imperfect understanding of the problem with a solution
[23:03] <xcezzz> osd op complaint time
[23:04] <xcezzz> but now im not sure what you were asking for specifically lol
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[23:04] <TMM> OK so, when I mark some osds down for maintenance and reboot the host when the host just comes back I see slow requests on the cluster. they are all in the range of 30.060499 and 31.760725 leading me to believe that is is 30 seconds of some kind of timeout + whatever time it takes to actually perform the op somewhere else
[23:05] <TMM> I'm using rbd with scsi and the scsi timeouts are by default 30 seconds
[23:05] <TMM> so ideally I'd reduce this time by at least 10 seconds
[23:05] <TMM> but I'd prefer it to go faster than that of course :)
[23:05] <xcezzz> im still confused???
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[23:05] <xcezzz> that value i would think you would want to ???increase??? so there???s no complaint while it does it thing
[23:05] <TMM> no, I need it to actually go faster
[23:06] <TMM> the rbd devices can't have individual scsi commands lasting longer than 30 seconds
[23:07] <xcezzz> oh.. hmm i guess then i am not sure??? i do not have any iscsi mounts off my rbds??? just kernel mounts and qemu rbd
[23:07] <TMM> I use qemu rbd with virtio-scsi instead of regular virtio
[23:07] <TMM> otherwise no TRIM
[23:07] <xcezzz> well ya??? but the thing that sucks is that iothread don???t work properly on virtio-scsi
[23:08] <xcezzz> or at least i have not gotten it to work right
[23:08] <TMM> iothread?
[23:08] <xcezzz> qemu will setup a separate thread for IO on the rbd device instead of trying to schedule it in with the actual vm thread
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[23:09] <xcezzz> the difference is night and day on io ops
[23:09] <TMM> I haven't had many iops problems so far
[23:09] <xcezzz> at least for us??? yes we are missing trim??? but if run them as virtio-scsi then it causes huge iowaits
[23:09] <TMM> what version of qemu do you use?
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[23:10] <TMM> I use qemu-kvm-ev-2.3.0-31.el7_2.10.1
[23:10] <xcezzz> QEMU emulator version 2.4.0.1
[23:10] <xcezzz> proxmox 4.1
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[23:10] <xcezzz> just curious what are your kvm args?
[23:11] <TMM> I haven't tried iothreads yet, I'll give it a go
[23:11] <TMM> anything in particular you're interested in?
[23:11] <TMM> I can do a libvirt dumpxml if you'd like?
[23:11] <xcezzz> just curious if you are already using iothread possibly???
[23:13] <xcezzz> to trim our servers that use our 16tb rbd mounts i have to restart them with the virtio-scsi turned on??? but every morning during a maintenance process the read io causes huge iowait and pushes load avg up to the 40s
[23:13] <xcezzz> if i reboot back to just standard virtio with iothread the same process barely moves it by 1 or 2
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[23:14] <TMM> xcezzz, http://paste.debian.net/441424/
[23:14] <TMM> let me try to generate some load in a vm
[23:19] <TMM> xcezzz, running some fio tests
[23:19] <TMM> I do see a lot of iowaits
[23:19] <xcezzz> http://imgur.com/NYc5Mtw
[23:19] <xcezzz> can you see where we turned off iothread??? lol
[23:20] <xcezzz> i am not sure what causes it exactly??? but it always would happen at the same time every day
[23:20] <xcezzz> during a cleanup job that is run by our backup servers???
[23:21] <TMM> well, I'm running a disk benchmark, I guess high iowait is kind of expected
[23:21] <xcezzz> ya it would probably definitely cause iowait??? but this was during normal operation that was never apparent until i turned on the scsi options for being able to trim
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[23:21] <xcezzz> so now we just only throw them into scsi for occasional trims
[23:22] <TMM> seeing about 5000 iops in my test vm with 16 threads rwrand fio test
[23:22] <TMM> about 90% iowait though
[23:23] <TMM> fio --filename=test --direct=1 --rw=randrw --refill_buffers --norandommap --randrepeat=0 --ioengine=sync --bs=130k,64k --rwmixread=50 --iodepth=16 --numjobs=16 --group_reporting --name=dbtest --size=10g --runtime=300 --time_based=1
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[23:23] <xcezzz> ya??? i wish i had perf data for the scsi boots??? observium cleans up old perfs if the dev no longer is on the machine and it???s been too long for it to still have it
[23:23] <xcezzz> but ya iothread made a huge diff
[23:23] <xcezzz> if u have time to try it i would def suggest it
[23:23] <TMM> did you enable iothread on nova?
[23:24] <TMM> and what was your problem with iothread and virtio-scsi?
[23:24] <xcezzz> well im in proxmox??? so not on nova
[23:24] <xcezzz> it just never actually used iothread
[23:24] <xcezzz> the gui9/interface would never keep it saved
[23:24] <xcezzz> if you forced the kvm args it would never actually create the iothread
[23:24] <TMM> ah
[23:24] <TMM> I'll give it a go
[23:24] <xcezzz> but apparently iothread with virtio-scsi is not ???ready"
[23:25] <TMM> it seems that iothread + virtio-scsi requires a virtual scsi adapter per disk
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[23:26] <xcezzz> ya we set that up..
[23:26] <TMM> although... I'm not entirely sure I mind that instances can't use more cpu cores than assigned to them
[23:27] <xcezzz> ya i mean it could be just related to our use case
[23:27] <xcezzz> its trying to do something in some weird way that just doesn???t jive with it as well as we think it should in scsi mode
[23:27] <TMM> what is the problem you were seeing exactly?
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[23:28] <xcezzz> every morning zabbix/nagios would start bitching that the load on the vm???s was hitting over 20
[23:28] <TMM> ah, so iothread was making it worse
[23:28] <xcezzz> no
[23:28] <xcezzz> it wasn???t working in the virtio-scsi pci/virtio-scsi rbd
[23:29] <TMM> oh, you didn't get any performance improvements at all?
[23:29] <xcezzz> if we just went back to virtio rbd iothread would ???stay??? on and the load problems went away
[23:29] <xcezzz> no we did!
[23:29] <xcezzz> but only with iothread on did the load never skyrocket like it was
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[23:29] <TMM> ok, I'm confused now
[23:29] <xcezzz> haha
[23:29] <TMM> what happened with virtio-scsi and iothread?
[23:30] <xcezzz> no iothread = high ass load
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[23:30] <xcezzz> iothread never seemed to work or ???stay on??? when virtio-scsi pci / virtio-scsi rbd
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[23:30] <TMM> ahh
[23:30] <xcezzz> when we reverted to virtio-scsi pci and virtio rbd iothread would stay on and never go crazy
[23:31] <TMM> xcezzz, this is what I'm seeing on my test instance http://paste.debian.net/441427/
[23:32] <TMM> xcezzz, doing another one with 4k,4k
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[23:38] <TMM> xcezzz, http://paste.debian.net/441428/
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[23:43] <TMM> The thing is, iops scale pretty well across my cluster. If I run 10 instances at the same time (doing that now) and running fio they all get that speed
[23:43] <TMM> which is actually what I'm more interested in than raw throughput for a single instance
[23:44] <TMM> I'd need to do this test again with iothread enabled
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