[Gluster-users] gnfs split brain when 1 server in 3x1 down (high load) - help request
Erik Jacobson
erik.jacobson at hpe.com
Mon Mar 30 01:01:06 UTC 2020
Thank you for replying!! Responses below...
I have attached the volume def (meant to before).
I have attached a couple logs from one of the leaders.
> That's odd.
> As far as I know, the client's are accessing one of the gluster nodes that serves as NFS server and then syncs data across the peers ,right?
Correct, although in this case, with a 1x3, all of them should have
local copies. Our first reports came in from 3x3 (9 server) systems but
we have been able to duplicate on 1x3 thankfully in house. This is a
huge step forward as I had no reproducer previously.
> What happens when the virtual IP(s) are failed over to the other gluster node? Is the issue resolved?
While we do use CTDB for managing the IPs aliases, I don't start the test until
the IP is stabilized. I put all 76 nodes on one IP alias to make a more
similar load to what we have in the field.
I think it is important to point out that if I reduce the load, all is
well. For examples, if the test were just booting -- where the initial
reports were seen -- just 1 or 2 nodes out of 1,000 would have an issue
each cycle. They all boot the same way and are all using the same IP
alias for NFS in my test case. So I think the split-brain messages are maybe
a symptom of some sort of timeout ??? (making stuff up here).
> Also, what kind of load balancing are you using ?
[I moved this question up because the below answer has too much
output]
We are doing very simple balancing - manual balancing. As we add compute
nodes to the cluster, a couple racks are assigned to IP alias #1, the
next couple to IP alias #2, and so on. I'm happy to not have the
complexity of a real load balancer right now.
> Do you get any split brain entries via 'gluster volume geal <VOL> info' ?
I ran two trials for the 'gluster volume heal ...'
Trial 1 - with all 3 servers up and while running the load:
[root at leader2 ~]# gluster volume heal cm_shared info
Brick 172.23.0.4:/data/brick_cm_shared
Status: Connected
Number of entries: 0
Brick 172.23.0.5:/data/brick_cm_shared
Status: Connected
Number of entries: 0
Brick 172.23.0.6:/data/brick_cm_shared
Status: Connected
Number of entries: 0
Trial 2 - with 1 server down (stopped glusterd on 1 server) - and
without doing any testing yet -- I see this. Let me explain though -
not in the error path, I am using RW NFS filesystem image blobs on this
same volume for the writable areas of the node. In the field, we
duplicate the problem with using TMPFS for that writable area. I am
happy to re-do the test with RO NFS and TMPFS for writable, which my
GUESS says the healing messages would go away. Would that help?
If you look at the heal count -- 76 -- that equals the node count - the
number of writable XFS image files using for writing for each node.
[root at leader2 ~]# gluster volume heal cm_shared info
Brick 172.23.0.4:/data/brick_cm_shared
Status: Transport endpoint is not connected
Number of entries: -
Brick 172.23.0.5:/data/brick_cm_shared
<gfid:b9412b45-d380-4789-a335-af5af33bde24>
<gfid:80ea53ba-a960-402b-9c6c-1cc62b2c59b3>
<gfid:1f10c050-7c50-4044-abc5-0a980ac6af79>
<gfid:8847f8a4-5509-463d-ac49-836bf921858c>
<gfid:a35fef6b-9174-495f-a661-d9837a1243ac>
<gfid:782dd55f-d85d-4f5e-b76f-8dd562356a59>
<gfid:5ea92161-c91a-4d51-877c-a3362966e850>
<gfid:57e5c49d-36c9-4a70-afd5-34ffbddb7da5>
Status: Connected
Number of entries: 8
Brick 172.23.0.6:/data/brick_cm_shared
<gfid:b9412b45-d380-4789-a335-af5af33bde24>
<gfid:80ea53ba-a960-402b-9c6c-1cc62b2c59b3>
<gfid:1f10c050-7c50-4044-abc5-0a980ac6af79>
<gfid:8847f8a4-5509-463d-ac49-836bf921858c>
<gfid:a35fef6b-9174-495f-a661-d9837a1243ac>
<gfid:782dd55f-d85d-4f5e-b76f-8dd562356a59>
<gfid:5ea92161-c91a-4d51-877c-a3362966e850>
<gfid:57e5c49d-36c9-4a70-afd5-34ffbddb7da5>
Status: Connected
Number of entries: 8
Trial 3 - ran the heal command around the time the split-brain errors
were being reported
[root at leader2 glusterfs]# gluster volume heal cm_shared info
Brick 172.23.0.4:/data/brick_cm_shared
Status: Transport endpoint is not connected
Number of entries: -
Brick 172.23.0.5:/data/brick_cm_shared
<gfid:80ea53ba-a960-402b-9c6c-1cc62b2c59b3>
<gfid:b9412b45-d380-4789-a335-af5af33bde24>
<gfid:08aff8a9-2818-44d6-a67d-d08c7894c496>
<gfid:8847f8a4-5509-463d-ac49-836bf921858c>
<gfid:57e5c49d-36c9-4a70-afd5-34ffbddb7da5>
<gfid:cd896244-f7e9-41ad-8510-d1fe5d0bf836>
<gfid:611fa1e0-dc0d-4ddc-9273-6035e51e1acf>
<gfid:686581b2-7515-4d0a-a1c8-369f01f60ecd>
<gfid:875e893b-f2ed-4805-95fd-6955ea310757>
<gfid:eb4203eb-06a4-4577-bddb-ba400d5cc7c7>
<gfid:4dd86ddd-aca3-403f-87eb-03a9c8116993>
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<gfid:09e8541b-a150-41da-aff8-3764c33635ba>
<gfid:b30f6bdb-e439-44c5-bd4c-143486439091>
<gfid:ae983848-3ba9-4f72-ab0c-d309f96d2678>
<gfid:9cddb5cd-a721-4d63-9522-7546a9c01303>
<gfid:91c1b906-14a5-4fe1-8103-91d14134706b>
<gfid:55cc28b7-80f1-428e-9334-5a0742cce1c6>
<gfid:8183219a-6d4a-4369-82dc-2233e2eba656>
<gfid:6cfacb2b-e247-488b-adde-e00dfc0c25f8>
<gfid:5184933d-6470-47dc-a010-6f7cb5661160>
<gfid:66e6842c-fe87-4797-8a01-a9b0a4124cde>
<gfid:55884d32-2e3f-42ba-a173-6c9362e331e2>
<gfid:47b9316a-7896-4efd-8704-3acdde6f2cb8>
<gfid:3a3013e2-06dd-41c7-b759-bd9e945c9743>
<gfid:3dc0b834-6f3e-409a-9549-f015f3b66af1>
<gfid:c9fc97ce-f8bc-42b2-b428-37953c172a30>
<gfid:a94ac3ba-9777-4844-892b-5526c00f2f7b>
Status: Connected
Number of entries: 76
Brick 172.23.0.6:/data/brick_cm_shared
<gfid:9cddb5cd-a721-4d63-9522-7546a9c01303>
<gfid:4f4da7fa-819d-45a4-bdb9-a81374b6df86>
<gfid:91c1b906-14a5-4fe1-8103-91d14134706b>
<gfid:55cc28b7-80f1-428e-9334-5a0742cce1c6>
<gfid:18b777df-72dc-4a57-a8a3-f22b54ceac3e>
<gfid:b6994926-5788-492b-8224-3a02100be9a2>
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<gfid:5184933d-6470-47dc-a010-6f7cb5661160>
<gfid:d4c4bc62-705b-405d-a4b4-941f8e55e5d2>
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<gfid:14f73281-21c9-4830-9a39-1eb6998eb955>
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<gfid:7dbd1e30-c4e0-4b19-8f0d-d4ef9199b89f>
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Status: Connected
Number of entries: 76
-------------- next part --------------
Volume Name: cm_shared
Type: Replicate
Volume ID: f6175f56-8422-4056-9891-f9ba84756b87
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 3 = 3
Transport-type: tcp
Bricks:
Brick1: 172.23.0.4:/data/brick_cm_shared
Brick2: 172.23.0.5:/data/brick_cm_shared
Brick3: 172.23.0.6:/data/brick_cm_shared
Options Reconfigured:
nfs.event-threads: 3
config.brick-threads: 16
config.client-threads: 16
performance.iot-pass-through: false
config.global-threading: off
performance.client-io-threads: on
nfs.disable: off
storage.fips-mode-rchecksum: on
transport.address-family: inet
features.cache-invalidation: on
features.cache-invalidation-timeout: 600
cluster.lookup-optimize: on
client.event-threads: 32
server.event-threads: 32
performance.stat-prefetch: on
performance.cache-invalidation: on
performance.md-cache-timeout: 600
network.inode-lru-limit: 1000000
performance.io-thread-count: 32
performance.cache-size: 8GB
performance.parallel-readdir: on
cluster.lookup-unhashed: auto
performance.flush-behind: on
performance.aggregate-size: 2048KB
performance.write-behind-trickling-writes: off
transport.listen-backlog: 16384
performance.write-behind-window-size: 1024MB
server.outstanding-rpc-limit: 1024
nfs.outstanding-rpc-limit: 1024
nfs.acl: on
storage.max-hardlinks: 0
performance.cache-refresh-timeout: 60
performance.md-cache-statfs: off
performance.nfs.io-cache: on
nfs.mount-rmtab: /-
nfs.nlm: off
nfs.export-volumes: on
nfs.export-dirs: on
nfs.exports-auth-enable: on
nfs.auth-refresh-interval-sec: 360
nfs.auth-cache-ttl-sec: 360
cluster.favorite-child-policy: none
nfs.mem-factor: 15
cluster.choose-local: true
network.ping-timeout: 42
cluster.read-hash-mode: 1
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Status of volume: cm_shared
Gluster process TCP Port RDMA Port Online Pid
------------------------------------------------------------------------------
Brick 172.23.0.5:/data/brick_cm_shared 49153 0 Y 50199
Brick 172.23.0.6:/data/brick_cm_shared 49153 0 Y 59380
Self-heal Daemon on localhost N/A N/A Y 10817
NFS Server on localhost 2049 0 Y 10775
Self-heal Daemon on 172.23.0.5 N/A N/A Y 16645
NFS Server on 172.23.0.5 2049 0 Y 16603
Task Status of Volume cm_shared
------------------------------------------------------------------------------
There are no active volume tasks
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