[Gluster-users] Stale locks on shards

[Samuli Heinonen]

Hi all!

One hypervisor on our virtualization environment crashed and now some of 
the VM images cannot be accessed. After investigation we found out that 
there was lots of images that still had active lock on crashed 
hypervisor. We were able to remove locks from "regular files", but it 
doesn't seem possible to remove locks from shards.

We are running GlusterFS 3.8.15 on all nodes.

Here is part of statedump that shows shard having active lock on crashed 
node:
[xlator.features.locks.zone2-ssd1-vmstor1-locks.inode]
path=/.shard/75353c17-d6b8-485d-9baf-fd6c700e39a1.21
mandatory=0
inodelk-count=1
lock-dump.domain.domain=zone2-ssd1-vmstor1-replicate-0:metadata
lock-dump.domain.domain=zone2-ssd1-vmstor1-replicate-0:self-heal
lock-dump.domain.domain=zone2-ssd1-vmstor1-replicate-0
inodelk.inodelk[0](ACTIVE)=type=WRITE, whence=0, start=0, len=0, pid = 
3568, owner=14ce372c397f0000, client=0x7f3198388770, connection-id 
ovirt8z2.xxx-5652-2017/12/27-09:49:02:946825-zone2-ssd1-vmstor1-client-1-7-0, 
granted at 2018-01-20 08:57:24

If we try to run clear-locks we get following error message:
# gluster volume clear-locks zone2-ssd1-vmstor1 
/.shard/75353c17-d6b8-485d-9baf-fd6c700e39a1.21 kind all inode
Volume clear-locks unsuccessful
clear-locks getxattr command failed. Reason: Operation not permitted

Gluster vol info if needed:
Volume Name: zone2-ssd1-vmstor1
Type: Replicate
Volume ID: b6319968-690b-4060-8fff-b212d2295208
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: rdma
Bricks:
Brick1: sto1z2.xxx:/ssd1/zone2-vmstor1/export
Brick2: sto2z2.xxx:/ssd1/zone2-vmstor1/export
Options Reconfigured:
cluster.shd-wait-qlength: 10000
cluster.shd-max-threads: 8
cluster.locking-scheme: granular
performance.low-prio-threads: 32
cluster.data-self-heal-algorithm: full
performance.client-io-threads: off
storage.linux-aio: off
performance.readdir-ahead: on
client.event-threads: 16
server.event-threads: 16
performance.strict-write-ordering: off
performance.quick-read: off
performance.read-ahead: on
performance.io-cache: off
performance.stat-prefetch: off
cluster.eager-lock: enable
network.remote-dio: on
cluster.quorum-type: none
network.ping-timeout: 22
performance.write-behind: off
nfs.disable: on
features.shard: on
features.shard-block-size: 512MB
storage.owner-uid: 36
storage.owner-gid: 36
performance.io-thread-count: 64
performance.cache-size: 2048MB
performance.write-behind-window-size: 256MB
server.allow-insecure: on
cluster.ensure-durability: off
config.transport: rdma
server.outstanding-rpc-limit: 512
diagnostics.brick-log-level: INFO

Any recommendations how to advance from here?

Best regards,
Samuli Heinonen