#ceph IRC Log

Index

IRC Log for 2016-01-08

Timestamps are in GMT/BST.

[0:00] * vasu (~vasu@c-73-231-60-138.hsd1.ca.comcast.net) Quit (Quit: Leaving)
[0:10] * dneary (~dneary@nat-pool-bos-u.redhat.com) Quit (Quit: Ex-Chat)
[0:17] * dougf (~dougf@96-38-99-179.dhcp.jcsn.tn.charter.com) Quit (Quit: bye)
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[1:18] * rendar (~I@host254-180-dynamic.251-95-r.retail.telecomitalia.it) Quit (Quit: std::lower_bound + std::less_equal *works* with a vector without duplicates!)
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[2:20] * garphy is now known as garphy`aw
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[3:53] <stefan_> Hi. I'm checking out Ceph for the first time and have a question. Is it possible to access an object created via the S3 API via disk access?
[3:53] <stefan_> The documentation is a bit confusing.
[3:54] <lurbs> Yes, eventually they're all just files on disk. You can find out where any individual file is stored using 'ceph osd map $pool $object'.
[3:54] <lurbs> But gnerally speaking you wouldn't.
[3:54] <lurbs> generally
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[4:02] <stefan_> @lurbs: Thanks! What is $object with respect to the bucket/key specified via the S3 API?
[4:02] <cephalobot> stefan_: Error: "lurbs:" is not a valid command.
[4:02] <lurbs> The name of the object itself.
[4:03] <lurbs> http://ceph.com/planet/ceph-osd-where-is-my-data/
[4:04] * fcape (~fcape@107-220-57-73.lightspeed.austtx.sbcglobal.net) has joined #ceph
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[4:04] <lurbs> Messing with anything in the OSD filesystems is typically only done as a last resort, in the event of data corruption.
[4:06] <stefan_> Ah, ok.
[4:07] <stefan_> I'm looking into use Ceph for some computational biology workflow execution applications. Are there any data access patterns that don't rely on copying data out of CephFS?
[4:08] <stefan_> I.e., I might have a 10GB object that I want to read.
[4:09] * naoto (~naotok@103.23.4.77) has joined #ceph
[4:12] <stefan_> Ah -- nm, I think I just need to look into `mount.ceph`. Thanks!
[4:19] * Tene_ is now known as Tene
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[6:46] <motk> anyone know when 9.2.1 will be out?
[6:47] * rotbeard (~redbeard@185.32.80.238) has joined #ceph
[6:50] <nils_> are you experience problems with 9.2.0? Just curious since I wanted to upgrade from Hammer just now
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[10:08] <flaf> aarontc: hello. Just for information, I haved tried what you proposed concerning files-layout. At the beginning, all was ok but unfortunately the setfattr command was impossible (operation not permitted). It's probably because I use ceph-fuse and probably files-layout needs to use use cephfs via the kernel client module. Voil??. ;)
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[10:13] <Be-El> flaf: managing cephfs pool with setfattr works fine with ceph-fuse
[10:14] <flaf> Be-El: ah ?
[10:14] <Be-El> flaf: that's how I actually do it...
[10:15] <Be-El> flaf: do you try to change the layout of existing files?
[10:16] <flaf> Be-El: can you confirm to me that to dedicated a sub-directory to a specific pool, the command is ???setfattr -n ceph.dir.layout.pool -v moodle_cache sub-dir/????
[10:16] <flaf> *dedicate
[10:17] <flaf> ???setfattr -n ceph.dir.layout.pool -v ssdpool sub-dir/????
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[10:18] <Be-El> # setfattr -n ceph.dir.layout.pool -v cephfs_two_rep_data bar && echo ok
[10:18] <Be-El> ok
[10:20] <flaf> When I have tried this command I had ???operation not permitted???. Maybe I need to change the rights of my cephfs account ?
[10:20] <Be-El> the command does not work if the directory has any content
[10:20] <Be-El> or the changes are not applied to the existing files
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[10:21] <Be-El> operation not permitted sounds like a permission problem with the ceph account
[10:21] <Be-El> do you have the necessary access rights for the data pools?
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[10:24] <flaf> good question... I'm seeing....
[10:26] <flaf> http://paste.alacon.org/39253
[10:27] <flaf> Be-El: so I need to just change de caps osd to => caps osd = "allow class-read object_prefix rbd_children, allow rwx pool=cephfsdata, allow rwx=ssdpool"
[10:27] <flaf> correct ?
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[10:28] <Be-El> flaf: i always mix up the syntax for multiple pools, but yes, you need access rights for all data pools
[10:29] <flaf> Be-El: ah, have multiple line ???caps ods??? is allowed ?
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[10:29] <Be-El> flaf: no, capabilities are oneliners
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[10:30] <Be-El> the syntax is not checked for certain errors and you may end up with incorrect permissions without any notice
[10:31] <Be-El> that's why I'm careful with capabilities
[10:31] <fghaas> Be-El: "allow rwx=ssdpool" is incorrect, should be "allow rwx pool=ssdpool"
[10:32] <fghaas> also, if you're specifically allowing "class-read object_prefix rbd_children", I *think* rw is sufficient on the pool and you can drop the x
[10:32] <flaf> Be-El: but I can check with ???ceph auth list???, this command is reliabe, isn't it?
[10:32] <Be-El> flaf: that command lists what ceph actually uses
[10:32] <Be-El> flaf: so checking it with ceph auth list afterwards is a good idea
[10:33] <flaf> fghaas: yes my syntax was false. :)
[10:33] <flaf> Be-El: ok.
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[10:52] <flaf> In fact, I just realize that I don't know how to just update the rights of a ceph account. Is it a problem if I just remove the account (ie ceph auth del client.cephfs), edit the file /etc/ceph/ceph.client.cephfs.keyring and recreate the account (ie ceph auth add client.cephfs -i /etc/ceph/ceph.client.cephfs.keyring)?
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[12:00] <flaf> Err... Be-El sorry to ping you, but it seems to me I have done exactly the right commands but it's doesn't work. http://paste.alacon.org/39254
[12:00] <flaf> have I forgotten something?
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[12:00] <flaf> It seems to me I'm closed of the solution...
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[12:01] <flaf> Should I umount/mount the cephfs in the client?
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[12:03] <flaf> (in my paste I wanted replaced "/mnt/moodle" by "/mnt/cephfs" to be more readable but I realize than I have replaced all the strings. Don't take account of that. :)
[12:03] <Be-El> flaf: you need more than just osd permissions for cephfs
[12:04] <flaf> Oh eck...
[12:04] <flaf> Sorry.
[12:04] <Be-El> http://docs.ceph.com/docs/master/cephfs/client-auth/
[12:04] <flaf> Be-El: I have done this => ceph auth caps client.cephfs osd 'allow class-read object_prefix rbd_children, allow rwx pool=cephfsdata, allow rwx pool=poolssd'
[12:04] <Be-El> that refers to the latest version, but you should get an idea
[12:04] <flaf> But the other rights have been deleted.
[12:05] <flaf> I thought the command above just update the osd rights.
[12:05] <flaf> When I change rights, I must redefine all rights, correct?
[12:06] <Be-El> correct
[12:06] <flaf> Oh, what a pity...
[12:10] <flaf> Be-El: I have always the same error. http://paste.alacon.org/39255
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[12:11] <flaf> I add that my rights in this paste are exactly the rights I had for cephfs but just with "allow rwx pool=poolssd" in addition.
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[12:13] <Be-El> flaf: the error message has changed from 'operation not permitted' to 'operation not supported'?
[12:13] <flaf> ah yes, correct
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[12:13] <flaf> I use ceph Infernalis with Ubuntu Trusty in the client.
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[12:14] <flaf> Maybe I need a mount option?
[12:15] <Be-El> flaf: i've used ceph-fuse with hammer only and it works for me[tm]
[12:15] <flaf> My basic fstab line => http://paste.alacon.org/39256
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[12:15] <Be-El> flaf: even on mount point created by 'ceph-fuse /foo' on the command line without any additional options
[12:16] <flaf> Ah... :)
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[12:16] <flaf> Ok, maybe a cephfs expert can tell me more information.
[12:17] <flaf> Anyway thx for your help Be-El. I think I'm closed...
[12:17] <Be-El> you're welcome
[12:18] <Be-El> do you have an existing layout for the directory and the parent directories?
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[12:18] <flaf> I don't think so. I have never touched it before.
[12:19] <flaf> Is it possible to check?
[12:19] <Be-El> flaf: getfattr -n ceph.dir.layout <path>
[12:20] <flaf> getfattr -n ceph.dir.layout /mnt/moodle/ tells me /mnt/moodle/: ceph.dir.layout: Operation not supported
[12:21] <flaf> Ah just a remark. When I have installed the package attr, the cephfs was already mounted.
[12:21] <flaf> Do you think it's important?
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[12:24] <Be-El> flaf: not sure. you can try to umount and mount again to check whether something was missing at mounttime
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[12:24] <Be-El> the package itself should just provide the getfattr/setfattr binaries
[12:25] <flaf> Done. But still the same error.
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[12:25] <flaf> Be-El: I think I'm going to ask the question in the ceph maling list.*
[12:25] <Be-El> flaf: most developer will be able later the day due to their timezone
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[12:28] <flaf> Ah, ok. There are European ceph dev too, aren't?
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[13:11] <Randleman> Welcome
[13:11] <Randleman> thanks
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[14:00] <flaf> Be-El: just one question: when you have used file-layouts via ceph-fuse with Hammer, could you tell me which was the OS of the client? And which kernel version?
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[14:01] <Be-El> flaf: ubuntu trusty, kernels from 3.13 to 4.4
[14:02] <flaf> What do you mean by "from 3.13 to 4.4". You used the 4.4 kernel, correct?
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[14:11] <Be-El> i've used several kernels starting from 3.13 (trusty default) to 4.4 (latest mainline build), includung 3.19 (vivid) and 4.2 (wily)
[14:11] <Be-El> most systems are on vivid
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[14:12] <flaf> Ah ok, so you have already used file-layouts with a 3.13 kernel for instance?
[14:13] <Be-El> yes
[14:13] <flaf> ok, Thx for the confirmation Be-El. ;)
[14:13] <Be-El> ceph-fuse works more or less independent of the kernel
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[14:13] <flaf> Yes indeed.
[14:14] <Be-El> and it takes care of accessing the right osd
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[14:43] <flaf> huhu
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[14:43] <flaf> Be-El: if I remove the noatime mount option it works (file-layout)
[14:43] <flaf> It's very curious.
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[14:44] <Be-El> that's unexpected. I'm trying to verify it
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[14:44] <flaf> The problem is I would like to keep the noatime option.
[14:45] <Be-El> i'm currently not using noatime, and it's a good idea to use it...
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[14:46] <flaf> Hum... very very curious.
[14:47] <flaf> I have mounted with noatime and (g|s)etfattr worked. Now, I try a mount without noatime and the commands work too. I don't understand...
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[14:48] <Be-El> I've mounted via ceph-fuse and noatime on a cluster machine, and setfattr works
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[14:49] <flaf> It's as if the fact to mount just once the cephfs without noatime had solved my problem. I don't understand...
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[14:57] <snake> hi, i test ceph with three 380G5 servers as nodes. In every node, i use one sas disk for journal, one for ods data disk, and run one osd deamon. so three nodes make up the basic ceph. every node with two 1000M band port, one for public network, another for cluster network. Client server has four 1000M band port, i made all in bond6. Switch is 1000M. Then I run qemu-system-x86, install win7. The
[14:57] <snake> PROBLEM is if i use -drive rbd:format=raw direct use ceph rbd, the IO is very poor, only 50MB for read and same for write. But if i map the rbd image to linux system, and format in ext4 and mount it. then create qemu image in that patition. the IO is up to 350 for read, and 320M for write. How and Why does this?
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[14:58] <snake> did someone meet with this problem?
[14:58] <Be-El> snake: cache?
[14:58] <snake> i don't know how to make cache work
[14:59] <IcePic_> yeah, wondered if it was some kind of difference in lazy allocation in the fast case.
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[14:59] <snake> use cache=writeback, seems nothing changed.
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[15:01] <bloatyfloat> snake: I think they mean OS cache - putting a filesystem on an rbd and creating a file on that means that qemu is interacting with the file locally on the system it runs on
[15:01] <bloatyfloat> as such it gets the advantages that come with local filesystems, like file caching in memory in the OS - when qemu speaks directly to an rbd you lose this benefit
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[15:02] <IcePic_> yeah
[15:02] <snake> i see. so why ceph's perfomance is so pool
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[15:03] <bloatyfloat> snake:I'd recommend reading through the ceph mailing list archives, relating to rbds, there's a number of options you can use to improve performance, such as ssd journals, tweaks to your ceph.conf on the osd servers
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[15:05] <IcePic_> also, measuring where your bottleneck is would be good, ceph is decent at using up all kinds of resources (or spreading them evenly) so its not all about sata-cable speeds or disk sizes but also computation and network offloading and so on.
[15:05] <IcePic_> perhaps half-of-a-gig-net == 50MB/s is relevant, in case the data needs to traverse the same gig twice for some reason
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[15:05] <snake> i read the priciple of rados. base on that three osds of sas disk that should not get 50M for read.
[15:08] <snake> if os cache works, i reboot the client server, and remap the rbd image, first read the qemu image still very fast. but use -drive rbd:... still very slow
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[15:14] <flaf> Be-El: in fact, the only explanation I see about these strange behaviours are (if correct, it's a bit shameful for me): 1. I have tried with bad rights 2. the bad rights have triggered an unmount of my cephfs without I see it 3. I set correct rights for my cephfs account but I launch setfattr command on a unmounted cephfs.... :( I think this is the pathetic story in fact.
[15:14] <flaf> Be-El: anyway thx again. :)
[15:15] <Be-El> flaf: the noatime flag definitely introduces some trouble
[15:15] <Be-El> flaf: i've just been unable to mount cephfs while using it
[15:16] <flaf> Ah ?
[15:16] <Be-El> mount: cannot remount block device client_mountpoint=/volumes read-write, is write-protected
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[15:16] <flaf> So finally maybe there is a real problem...
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[15:18] <snake> CRUSH will map big file pieces to osds, and client will direct access to osds.
[15:18] <snake> so i make the bond 6 in client server
[15:20] <snake> so 3 osds if read simultaneously, read speed will max to 3000M bits.
[15:20] <snake> 50M bytes is too slow.
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