[Gluster-users] [Possibile SPAM] Re: Problem with Gluster 3.12.4, VM and sharding

Wed Jan 17 10:00:47 UTC 2018

On Tue, Jan 16, 2018 at 10:47 PM, Ing. Luca Lazzeroni - Trend Servizi Srl <
luca at gvnet.it> wrote:

> I've made the test with raw image format (preallocated too) and the
> corruption problem is still there (but without errors in bricks' log file).
>
> What does the "link" error in bricks log files means ?
>
> I've seen the source code looking for the lines where it happens and it
> seems a warning (it doesn't imply a failure).
>

Indeed, it only represents a transient state when the shards are created
for the first time and does not indicate a failure.
Could you also get the logs of the gluster fuse mount process? It should be
under /var/log/glusterfs of your client machine with the filename as a
hyphenated mount point path.

For example, if your volume was mounted at /mnt/glusterfs, then your log
file would be named mnt-glusterfs.log.

-Krutika

>
> Il 16/01/2018 17:39, Ing. Luca Lazzeroni - Trend Servizi Srl ha scritto:
>
> An update:
>
> I've tried, for my tests, to create the vm volume as
>
> qemu-img create -f qcow2 -o preallocation=full
> gluster://gluster1/Test/Test-vda.img 20G
>
> et voila !
>
> No errors at all, neither in bricks' log file (the "link failed" message
> disappeared), neither in VM (no corruption and installed succesfully).
>
> I'll do another test with a fully preallocated raw image.
>
>
>
> Il 16/01/2018 16:31, Ing. Luca Lazzeroni - Trend Servizi Srl ha scritto:
>
> I've just done all the steps to reproduce the problem.
>
> Tha VM volume has been created via "qemu-img create -f qcow2
> Test-vda2.qcow2 20G" on the gluster volume mounted via FUSE. I've tried
> also to create the volume with preallocated metadata, which moves the
> problem a bit far away (in time). The volume is a replice 3 arbiter 1
> volume hosted on XFS bricks.
>
> Here are the informations:
>
> [root at ovh-ov1 bricks]# gluster volume info gv2a2
>
> Volume Name: gv2a2
> Type: Replicate
> Volume ID: 83c84774-2068-4bfc-b0b9-3e6b93705b9f
> Status: Started
> Snapshot Count: 0
> Number of Bricks: 1 x (2 + 1) = 3
> Transport-type: tcp
> Bricks:
> Brick1: gluster1:/bricks/brick2/gv2a2
> Brick2: gluster3:/bricks/brick3/gv2a2
> Brick3: gluster2:/bricks/arbiter_brick_gv2a2/gv2a2 (arbiter)
> Options Reconfigured:
> storage.owner-gid: 107
> storage.owner-uid: 107
> user.cifs: off
> features.shard: on
> cluster.shd-wait-qlength: 10000
> cluster.shd-max-threads: 8
> cluster.locking-scheme: granular
> cluster.data-self-heal-algorithm: full
> cluster.server-quorum-type: server
> cluster.quorum-type: auto
> cluster.eager-lock: enable
> network.remote-dio: enable
> performance.low-prio-threads: 32
> performance.io-cache: off
> performance.read-ahead: off
> performance.quick-read: off
> transport.address-family: inet
> nfs.disable: off
> performance.client-io-threads: off
>
> /var/log/glusterfs/glusterd.log:
>
> [2018-01-15 14:17:50.196228] I [MSGID: 106488] [glusterd-handler.c:1548:__
> glusterd_handle_cli_get_volume] 0-management: Received get vol req
> [2018-01-15 14:25:09.555214] I [MSGID: 106488] [glusterd-handler.c:1548:__
> glusterd_handle_cli_get_volume] 0-management: Received get vol req
>
> (empty because today it's 2018-01-16)
>
> /var/log/glusterfs/glustershd.log:
>
> [2018-01-14 02:23:02.731245] I [glusterfsd-mgmt.c:1821:mgmt_getspec_cbk]
> 0-glusterfs: No change in volfile,continuing
>
> (empty too)
>
> /var/log/glusterfs/bricks/brick-brick2-gv2a2.log (the interested volume):
>
> [2018-01-16 15:14:37.809965] I [MSGID: 115029] [server-handshake.c:793:server_setvolume]
> 0-gv2a2-server: accepted client from ovh-ov1-10302-2018/01/16-15:
> 14:37:790306-gv2a2-client-0-0-0 (version: 3.12.4)
> [2018-01-16 15:16:41.471751] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.4 failed
> [2018-01-16 15:16:41.471745] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.4
> ->  /bricks/brick2/gv2a2/.glusterfs/a0/14/a0144df3-8d89-4aed-872e-5fef141e9e1efailed
> [File exists]
> [2018-01-16 15:16:42.593392] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.5
> -> /bricks/brick2/gv2a2/.glusterfs/eb/04/eb044e6e-3a23-40a4-9ce1-f13af148eb67failed
> [File exists]
> [2018-01-16 15:16:42.593426] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.5 failed
> [2018-01-16 15:17:04.129593] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.8
> -> /bricks/brick2/gv2a2/.glusterfs/dc/92/dc92bd0a-0d46-4826-a4c9-d073a924dd8dfailed
> [File exists]
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.8
> -> /bricks/brick2/gv2a2/.glusterfs/dc/92/dc92bd0a-0d46-4826-a4c9-d073a924dd8dfailed
> [File exists]" repeated 5 times between [2018-01-16 15:17:04.129593] and
> [2018-01-16 15:17:04.129593]
> [2018-01-16 15:17:04.129661] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.8 failed
> [2018-01-16 15:17:08.279162] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.9
> -> /bricks/brick2/gv2a2/.glusterfs/c9/b7/c9b71b00-a09f-4df1-b874-041820ca8241failed
> [File exists]
> [2018-01-16 15:17:08.279162] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.9
> -> /bricks/brick2/gv2a2/.glusterfs/c9/b7/c9b71b00-a09f-4df1-b874-041820ca8241failed
> [File exists]
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.9
> -> /bricks/brick2/gv2a2/.glusterfs/c9/b7/c9b71b00-a09f-4df1-b874-041820ca8241failed
> [File exists]" repeated 2 times between [2018-01-16 15:17:08.279162] and
> [2018-01-16 15:17:08.279162]
>
> [2018-01-16 15:17:08.279177] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.9 failed
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.4
> -> /bricks/brick2/gv2a2/.glusterfs/a0/14/a0144df3-8d89-4aed-872e-5fef141e9e1efailed
> [File exists]" repeated 6 times between [2018-01-16 15:16:41.471745] and
> [2018-01-16 15:16:41.471807]
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.5
> -> /bricks/brick2/gv2a2/.glusterfs/eb/04/eb044e6e-3a23-40a4-9ce1-f13af148eb67failed
> [File exists]" repeated 2 times between [2018-01-16 15:16:42.593392] and
> [2018-01-16 15:16:42.593430]
> [2018-01-16 15:17:32.229689] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.14
> -> /bricks/brick2/gv2a2/.glusterfs/53/04/530449fa-d698-4928-a262-9a0234232323failed
> [File exists]
> [2018-01-16 15:17:32.229720] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.14 failed
> [2018-01-16 15:18:07.154330] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.17
> -> /bricks/brick2/gv2a2/.glusterfs/81/96/8196dd19-84bc-4c3d-909f-8792e9b4929dfailed
> [File exists]
> [2018-01-16 15:18:07.154375] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.17 failed
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.14
> -> /bricks/brick2/gv2a2/.glusterfs/53/04/530449fa-d698-4928-a262-9a0234232323failed
> [File exists]" repeated 7 times between [2018-01-16 15:17:32.229689] and
> [2018-01-16 15:17:32.229806]
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.17
> -> /bricks/brick2/gv2a2/.glusterfs/81/96/8196dd19-84bc-4c3d-909f-8792e9b4929dfailed
> [File exists]" repeated 3 times between [2018-01-16 15:18:07.154330] and
> [2018-01-16 15:18:07.154357]
> [2018-01-16 15:19:23.618794] W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.21
> -> /bricks/brick2/gv2a2/.glusterfs/6d/02/6d02bd98-83de-43e8-a7af-b1d5f5160403failed
> [File exists]
> [2018-01-16 15:19:23.618827] E [MSGID: 113020] [posix.c:1485:posix_mknod]
> 0-gv2a2-posix: setting gfid on /bricks/brick2/gv2a2/.shard/
> 62335cb9-c7b5-4735-a879-59cff93fe622.21 failed
> The message "W [MSGID: 113096] [posix-handle.c:770:posix_handle_hard]
> 0-gv2a2-posix: link /bricks/brick2/gv2a2/.shard/62335cb9-c7b5-4735-a879-59cff93fe622.21
> -> /bricks/brick2/gv2a2/.glusterfs/6d/02/6d02bd98-83de-43e8-a7af-b1d5f5160403failed
> [File exists]" repeated 3 times between [2018-01-16 15:19:23.618794] and
> [2018-01-16 15:19:23.618794]
>
> Thank you,
>
> Il 16/01/2018 11:40, Krutika Dhananjay ha scritto:
>
> Also to help isolate the component, could you answer these:
>
> 1. on a different volume with shard not enabled, do you see this issue?
> 2. on a plain 3-way replicated volume (no arbiter), do you see this issue?
>
>
>
> On Tue, Jan 16, 2018 at 4:03 PM, Krutika Dhananjay <kdhananj at redhat.com>
> wrote:
>
>> Please share the volume-info output and the logs under
>> /var/log/glusterfs/ from all your nodes. for investigating the issue.
>>
>> -Krutika
>>
>> On Tue, Jan 16, 2018 at 1:30 PM, Ing. Luca Lazzeroni - Trend Servizi Srl
>> <luca at gvnet.it> wrote:
>>
>>> Hi to everyone.
>>>
>>> I've got a strange problem with a gluster setup: 3 nodes with Centos
>>> 7.4, Gluster 3.12.4 from Centos/Gluster repositories, QEMU-KVM version
>>> 2.9.0 (compiled from RHEL sources).
>>>
>>> I'm running volumes in replica 3 arbiter 1 mode (but I've got a volume
>>> in "pure" replica 3 mode too). I've applied the "virt" group settings to my
>>> volumes since they host VM images.
>>>
>>> If I try to install something (eg: Ubuntu Server 16.04.3) on a VM (and
>>> so I generate a bit of I/O inside it) and configure KVM to access gluster
>>> volume directly (via libvirt), install fails after a while because the disk
>>> content is corrupted. If I inspect the block inside the disk (by accessing
>>> the image directly from outside) I can found many files filled with "^@".
>>>
>>
> Also, what exactly do you mean by accessing the image directly from
> outside? Was it from the brick directories directly? Was it from the mount
> point of the volume? Could you elaborate? Which files exactly did you check?
>
> -Krutika
>
>
>>> If, instead, I configure KVM to access VM images via a FUSE mount,
>>> everything seems to work correctly.
>>>
>>> Note that the problem with install is verified 100% time with QCOW2
>>> image, while it appears only after with RAW disk images.
>>>
>>> Is there anyone who experienced the same problem ?
>>>
>>> Thank you,
>>>
>>>
>>> --
>>> Ing. Luca Lazzeroni
>>> Responsabile Ricerca e Sviluppo
>>> Trend Servizi Srl
>>> Tel: 0376/631761
>>> Web: https://www.trendservizi.it
>>>
>>> _______________________________________________
>>> Gluster-users mailing list
>>> Gluster-users at gluster.org
>>> http://lists.gluster.org/mailman/listinfo/gluster-users
>>>
>>
>>
>
> --
> Ing. Luca Lazzeroni
> Responsabile Ricerca e Sviluppo
> Trend Servizi Srl
> Tel: 0376/631761
> Web: https://www.trendservizi.it
>
>
>
> _______________________________________________
> Gluster-users mailing listGluster-users at gluster.orghttp://lists.gluster.org/mailman/listinfo/gluster-users
>
>
> --
> Ing. Luca Lazzeroni
> Responsabile Ricerca e Sviluppo
> Trend Servizi Srl
> Tel: 0376/631761
> Web: https://www.trendservizi.it
>
>
>
> _______________________________________________
> Gluster-users mailing listGluster-users at gluster.orghttp://lists.gluster.org/mailman/listinfo/gluster-users
>
>
> --
> Ing. Luca Lazzeroni
> Responsabile Ricerca e Sviluppo
> Trend Servizi Srl
> Tel: 0376/631761
> Web: https://www.trendservizi.it
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
>
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