[Gluster-users] Glusterd seems to be ignoring that the underling filesystem got missing

Luca Gervasi luca.gervasi at gmail.com
Fri Sep 23 16:06:34 UTC 2016 

Hi guys,
I've got a strange problem involving this timeline (matches the "Log
fragment 1" excerpt)
19:56:50: disk is detached from my system. This disk is actually the brick
of the volume V.
19:56:50: LVM sees the disk as unreachable and starts its maintenance
procedures
19:56:50: LVM umounts my thin provisioned volumes
19:57:02: Health check on specific bricks fails thus moving the brick to a
down state
19:57:32: XFS filesystem umounts

At this point, the brick filesystem is no longer mounted. The underlying
filesystems is empty (misses the brick directory too). My assumption is
that gluster would stop itself in such conditions: it is not.
Gluster slowly fills my entire root partition, creating its full tree.

My only warning point is the disk that starts to fill its inodes to 100%.

I've read release notes for every version subsequent mine (3.7.14, 3.7.15)
without finding relevant fixes and at this point i'm pretty sure is some
bug undocumented.
Servers were made symmetric.

Could you please help me understand how to avoid that gluster coninues
write on an unmounted filesystem? Thanks.

I'm running a 3 node replica on 3 azure vms. This is the configuration:

MD (yes, i use md to aggregate 4 disks into a single 4Tb volume):
/dev/md128:
        Version : 1.2
  Creation Time : Mon Aug 29 18:10:45 2016
     Raid Level : raid0
     Array Size : 4290248704 (4091.50 GiB 4393.21 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Mon Aug 29 18:10:45 2016
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 512K

           Name : 128
           UUID : d5c51214:43e48da9:49086616:c1371514
         Events : 0

    Number   Major   Minor   RaidDevice State
       0       8       80        0      active sync   /dev/sdf
       1       8       96        1      active sync   /dev/sdg
       2       8      112        2      active sync   /dev/sdh
       3       8      128        3      active sync   /dev/sdi

PV, VG, LV status
  PV         VG      Fmt  Attr PSize PFree DevSize PV UUID

  /dev/md127 VGdata  lvm2 a--  2.00t 2.00t   2.00t
Kxb6C0-FLIH-4rB1-DKyf-IQuR-bbPE-jm2mu0
  /dev/md128 gluster lvm2 a--  4.00t 1.07t   4.00t
lDazuw-zBPf-Duis-ZDg1-3zfg-53Ba-2ZF34m

 VG      Attr   Ext   #PV #LV #SN VSize VFree VG UUID
         VProfile
  VGdata  wz--n- 4.00m   1   0   0 2.00t 2.00t
XI2V2X-hdxU-0Jrn-TN7f-GSEk-7aNs-GCdTtn
  gluster wz--n- 4.00m   1   6   0 4.00t 1.07t
ztxX4f-vTgN-IKop-XePU-OwqW-T9k6-A6uDk0

 LV                  VG      #Seg Attr       LSize   Maj Min KMaj KMin Pool
    Origin Data%  Meta%  Move Cpy%Sync Log Convert LV UUID
               LProfile
  apps-data           gluster    1 Vwi-aotz--  50.00g  -1  -1  253   12
thinpool        0.08
 znUMbm-ax1N-R7aj-dxLc-gtif-WOvk-9QC8tq
  feed                gluster    1 Vwi-aotz-- 100.00g  -1  -1  253   14
thinpool        0.08
 hZ4Isk-dELG-lgFs-2hJ6-aYid-8VKg-3jJko9
  homes               gluster    1 Vwi-aotz--   1.46t  -1  -1  253   11
thinpool        58.58
salIPF-XvsA-kMnm-etjf-Uaqy-2vA9-9WHPkH
  search-data         gluster    1 Vwi-aotz-- 100.00g  -1  -1  253   13
thinpool        16.41
Z5hoa3-yI8D-dk5Q-2jWH-N5R2-ge09-RSjPpQ
  thinpool            gluster    1 twi-aotz--   2.93t  -1  -1  253    9
            29.85  60.00
 oHTbgW-tiPh-yDfj-dNOm-vqsF-fBNH-o1izx2
  video-asset-manager gluster    1 Vwi-aotz-- 100.00g  -1  -1  253   15
thinpool        0.07
 4dOXga-96Wa-u3mh-HMmE-iX1I-o7ov-dtJ8lZ

Gluster volume configuration (all volumes use the same exact configuration,
listing them all would be redundant)
Volume Name: vol-homes
Type: Replicate
Volume ID: 0c8fa62e-dd7e-429c-a19a-479404b5e9c6
Status: Started
Number of Bricks: 1 x 3 = 3
Transport-type: tcp
Bricks:
Brick1: glu01.prd.azr:/bricks/vol-homes/brick1
Brick2: glu02.prd.azr:/bricks/vol-homes/brick1
Brick3: glu03.prd.azr:/bricks/vol-homes/brick1
Options Reconfigured:
performance.readdir-ahead: on
cluster.server-quorum-type: server
nfs.disable: disable
cluster.lookup-unhashed: auto
performance.nfs.quick-read: on
performance.nfs.read-ahead: on
performance.cache-size: 4096MB
cluster.self-heal-daemon: enable
diagnostics.brick-log-level: ERROR
diagnostics.client-log-level: ERROR
nfs.rpc-auth-unix: off
nfs.acl: off
performance.nfs.io-cache: on
performance.client-io-threads: on
performance.nfs.stat-prefetch: on
performance.nfs.io-threads: on
diagnostics.latency-measurement: on
diagnostics.count-fop-hits: on
performance.md-cache-timeout: 1
performance.cache-refresh-timeout: 1
performance.io-thread-count: 16
performance.high-prio-threads: 16
performance.normal-prio-threads: 16
performance.low-prio-threads: 16
performance.least-prio-threads: 1
cluster.server-quorum-ratio: 60

fstab:
/dev/gluster/homes                              /bricks/vol-homes
        xfs defaults,noatime,nobarrier,nofail 0 2

Software:
CentOS Linux release 7.1.1503 (Core)
glusterfs-api-3.7.13-1.el7.x86_64
glusterfs-libs-3.7.13-1.el7.x86_64
glusterfs-3.7.13-1.el7.x86_64
glusterfs-fuse-3.7.13-1.el7.x86_64
glusterfs-server-3.7.13-1.el7.x86_64
glusterfs-client-xlators-3.7.13-1.el7.x86_64
glusterfs-cli-3.7.13-1.el7.x86_64


Log fragment 1:
Sep 22 19:56:50 glu03 lvm[868]: WARNING: Device for PV
lDazuw-zBPf-Duis-ZDg1-3zfg-53Ba-2ZF34m not found or rejected by a filter.
Sep 22 19:56:50 glu03 lvm[868]: Cannot change VG gluster while PVs are
missing.
Sep 22 19:56:50 glu03 lvm[868]: Consider vgreduce --removemissing.
Sep 22 19:56:50 glu03 lvm[868]: Failed to extend thin metadata
gluster-thinpool-tpool.
Sep 22 19:56:50 glu03 lvm[868]: Unmounting thin volume
gluster-thinpool-tpool from /bricks/vol-homes.
Sep 22 19:56:50 glu03 lvm[868]: Unmounting thin volume
gluster-thinpool-tpool from /bricks/vol-search-data.
Sep 22 19:56:50 glu03 lvm[868]: Unmounting thin volume
gluster-thinpool-tpool from /bricks/vol-apps-data.
Sep 22 19:56:50 glu03 lvm[868]: Unmounting thin volume
gluster-thinpool-tpool from /bricks/vol-video-asset-manager.
Sep 22 19:57:02 glu03 bricks-vol-video-asset-manager-brick1[45162]:
[2016-09-22 17:57:02.713428] M [MSGID: 113075]
[posix-helpers.c:1844:posix_health_check_thread_proc]
0-vol-video-asset-manager-posix: health-check failed, going down
Sep 22 19:57:05 glu03 bricks-vol-apps-data-brick1[44536]: [2016-09-22
17:57:05.186146] M [MSGID: 113075]
[posix-helpers.c:1844:posix_health_check_thread_proc]
0-vol-apps-data-posix: health-check failed, going down
Sep 22 19:57:18 glu03 bricks-vol-search-data-brick1[40928]: [2016-09-22
17:57:18.674279] M [MSGID: 113075]
[posix-helpers.c:1844:posix_health_check_thread_proc]
0-vol-search-data-posix: health-check failed, going down
Sep 22 19:57:32 glu03 bricks-vol-video-asset-manager-brick1[45162]:
[2016-09-22 17:57:32.714461] M [MSGID: 113075]
[posix-helpers.c:1850:posix_health_check_thread_proc]
0-vol-video-asset-manager-posix: still alive! -> SIGTERM
Sep 22 19:57:32 glu03 kernel: XFS (dm-15): Unmounting Filesystem
Sep 22 19:57:35 glu03 bricks-vol-apps-data-brick1[44536]: [2016-09-22
17:57:35.186352] M [MSGID: 113075]
[posix-helpers.c:1850:posix_health_check_thread_proc]
0-vol-apps-data-posix: still alive! -> SIGTERM
Sep 22 19:57:35 glu03 kernel: XFS (dm-12): Unmounting Filesystem
Sep 22 19:57:48 glu03 bricks-vol-search-data-brick1[40928]: [2016-09-22
17:57:48.674444] M [MSGID: 113075]
[posix-helpers.c:1850:posix_health_check_thread_proc]
0-vol-search-data-posix: still alive! -> SIGTERM
Sep 22 19:57:48 glu03 kernel: XFS (dm-13): Unmounting Filesystem
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