7:43 a.m.
Hi All,
my setup is running in three nodes wherein 1 is arbiter node and another two is replica,
now one of my replica node entirely dead and wanted to replace it with new node, how do I
proceed the node replacement and safely remove the replica node?
7:50 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
Hello
There is an ansible playbook[2] for replacing a failed host in a
gluster-enabled cluster, do check it out [1], and see if that would work
out for you.
[1]
https://github.com/gluster/gluster-ansible/blob/master/playbooks/hc-ansib...
[2]https://github.com/gluster/gluster-ansible
On Tue, Nov 2, 2021 at 11:14 AM dhanaraj.ramesh--- via Users <
users(a)ovirt.org> wrote:
Hi All,
my setup is running in three nodes wherein 1 is arbiter node and another
two is replica, now one of my replica node entirely dead and wanted to
replace it with new node, how do I proceed the node replacement and safely
remove the replica node?
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8:21 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
In order to remove a dead host you will need to:- Remove all bricks (originating from that
host ) in all volumes of the TSPgluster volume remove-brick engine
host3:/gluster_bricks/brick1/ force- Remove the host from the TSPgluster peer-detach
host3
- Next remove the host from oVirt. In some cases you have to mark the host as rebooted, so
the engine can cancel any tasks that were supposed to run there. IT IS MANDATORY YO VERIFY
THAT THE HOST IS OFFLINE AND HAS NO ACCESS TO THE STORAGE. IF THE NODE IS STILL ALIVE -
FIX VDSM!
Best Regards,Strahil Nikolov
On Tue, Nov 2, 2021 at 7:51, Ritesh Chikatwar<rchikatw(a)redhat.com> wrote:
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11:38 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
when I try to remove all the node 2 bricks getting below error
volume remove-brick commit force: failed: Bricks not from same subvol for replica
when try to remove node 2 just one brick getting below error
volume remove-brick commit force: failed: Remove brick incorrect brick count of 1 for
replica 3
my setup running with 3 replica with 1 arbiter, and unable to remove the 2nd dead node...
11:41 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
the volume configured with Distributed Replicate volume with 7 bricks, when I try from GUI
getting below error.
Error while executing action Remove Gluster Volume Bricks: Volume remove brick force
failed: rc=-1 out=() err=['Remove arbiter brick(s) only when converting from arbiter
to replica 2 subvolume_']
10:10 p.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
You have to specify the volume type.When you remove 1 brick from a replica 3 volume - you
are actually converting it to replica 2.
As you got 2 data bricks + 1 arbiter, then Just remove the arbiter brick and the missing
node's brick:
gluster volume remove-brick VOL replica 1 node2:/brick node3:/brick force
What is the output of 'gluster volume info VOL' & 'gluster volume heal VOL
info summary' ?
Best Regards,Strahil Nikolov
On Wed, Nov 10, 2021 at 11:42, dhanaraj.ramesh--- via Users<users(a)ovirt.org>
wrote: the volume configured with Distributed Replicate volume with 7 bricks, when I try
from GUI getting below error.
Error while executing action Remove Gluster Volume Bricks: Volume remove brick force
failed: rc=-1 out=() err=['Remove arbiter brick(s) only when converting from arbiter
to replica 2 subvolume_']
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6:13 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
Hi Strahil Nikolov
Thank you for the suggestion but it does not help...
[root@beclovkvma01 ~]# sudo gluster volume remove-brick datastore1 replica 1
beclovkvma02.bec..net:/data/brick2/brick2 beclovkvma02.bec..net:/data/brick3/brick3
beclovkvma02.bec..net:/data/brick4/brick4 beclovkvma02.bec..net:/data/brick5/brick5
beclovkvma02.bec..net:/data/brick6/brick6 beclovkvma02.bec..net:/data/brick7/brick7
beclovkvma02.bec..net:/data/brick8/brick8 force
Remove-brick force will not migrate files from the removed bricks, so they will no longer
be available on the volume.
Do you want to continue? (y/n) y
volume remove-brick commit force: failed: need 14(xN) bricks for reducing replica count of
the volume from 3 to 1
[root@beclovkvma01 ~]# sudo gluster volume remove-brick datastore1 replica 1
beclovkvma02.bec..net:/data/brick2/brick2 forceRemove-brick force will not migrate files
from the removed bricks, so they will no longer be available on the volume.
Do you want to continue? (y/n) y
volume remove-brick commit force: failed: need 14(xN) bricks for reducing replica count of
the volume from 3 to 1
[root@beclovkvma01 ~]# sudo gluster volume remove-brick datastore1 replica 2
beclovkvma02.bec..net:/data/brick2/brick2 force
Remove-brick force will not migrate files from the removed bricks, so they will no longer
be available on the volume.
Do you want to continue? (y/n) y
volume remove-brick commit force: failed: need 7(xN) bricks for reducing replica count of
the volume from 3 to 2
6:42 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
Please provide 'gluster volume info datastore1' and specify which bricks you want
to remove.
Best Regards,Strahil Nikolov
On Thu, Nov 11, 2021 at 6:13, dhanaraj.ramesh--- via Users<users(a)ovirt.org> wrote:
Hi Strahil Nikolov
Thank you for the suggestion but it does not help...
[root@beclovkvma01 ~]# sudo gluster volume remove-brick datastore1 replica 1
beclovkvma02.bec..net:/data/brick2/brick2 beclovkvma02.bec..net:/data/brick3/brick3
beclovkvma02.bec..net:/data/brick4/brick4 beclovkvma02.bec..net:/data/brick5/brick5
beclovkvma02.bec..net:/data/brick6/brick6 beclovkvma02.bec..net:/data/brick7/brick7
beclovkvma02.bec..net:/data/brick8/brick8 force
Remove-brick force will not migrate files from the removed bricks, so they will no longer
be available on the volume.
Do you want to continue? (y/n) y
volume remove-brick commit force: failed: need 14(xN) bricks for reducing replica count of
the volume from 3 to 1
[root@beclovkvma01 ~]# sudo gluster volume remove-brick datastore1 replica 1
beclovkvma02.bec..net:/data/brick2/brick2 forceRemove-brick force will not migrate files
from the removed bricks, so they will no longer be available on the volume.
Do you want to continue? (y/n) y
volume remove-brick commit force: failed: need 14(xN) bricks for reducing replica count of
the volume from 3 to 1
[root@beclovkvma01 ~]# sudo gluster volume remove-brick datastore1 replica 2
beclovkvma02.bec..net:/data/brick2/brick2 force
Remove-brick force will not migrate files from the removed bricks, so they will no longer
be available on the volume.
Do you want to continue? (y/n) y
volume remove-brick commit force: failed: need 7(xN) bricks for reducing replica count of
the volume from 3 to 2
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8:11 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
Hi Strahil Nikolov
Volume Name: datastore1
Type: Distributed-Replicate
Volume ID: bc362259-14d4-4357-96bd-8db6492dc788
Status: Started
Snapshot Count: 0
Number of Bricks: 7 x (2 + 1) = 21
Transport-type: tcp
Bricks:
Brick1: beclovkvma01.bec.net:/data/brick2/brick2
Brick2: beclovkvma02.bec.net:/data/brick2/brick2
Brick3: beclovkvma03.bec.net:/data/brick1/brick2 (arbiter)
Brick4: beclovkvma01.bec.net:/data/brick3/brick3
Brick5: beclovkvma02.bec.net:/data/brick3/brick3
Brick6: beclovkvma03.bec.net:/data/brick1/brick3 (arbiter)
Brick7: beclovkvma01.bec.net:/data/brick4/brick4
Brick8: beclovkvma02.bec.net:/data/brick4/brick4
Brick9: beclovkvma03.bec.net:/data/brick1/brick4 (arbiter)
Brick10: beclovkvma01.bec.net:/data/brick5/brick5
Brick11: beclovkvma02.bec.net:/data/brick5/brick5
Brick12: beclovkvma03.bec.net:/data/brick1/brick5 (arbiter)
Brick13: beclovkvma01.bec.net:/data/brick6/brick6
Brick14: beclovkvma02.bec.net:/data/brick6/brick6
Brick15: beclovkvma03.bec.net:/data/brick1/brick6 (arbiter)
Brick16: beclovkvma01.bec.net:/data/brick7/brick7
Brick17: beclovkvma02.bec.net:/data/brick7/brick7
Brick18: beclovkvma03.bec.net:/data/brick1/brick7 (arbiter)
Brick19: beclovkvma01.bec.net:/data/brick8/brick8
Brick20: beclovkvma02.bec.net:/data/brick8/brick8
Brick21: beclovkvma03.bec.net:/data/brick1/brick8 (arbiter)
Options Reconfigured:
performance.client-io-threads: on
nfs.disable: on
transport.address-family: inet
storage.fips-mode-rchecksum: on
cluster.lookup-optimize: off
server.keepalive-count: 5
server.keepalive-interval: 2
server.keepalive-time: 10
server.tcp-user-timeout: 20
network.ping-timeout: 30
server.event-threads: 4
client.event-threads: 4
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
performance.strict-o-direct: on
performance.low-prio-threads: 32
storage.owner-gid: 36
storage.owner-uid: 36
network.remote-dio: off
All the bricks from beclovkvma02.bec.net as the node 2 dead, now the node has been
reinstalled,
8:17 a.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
wanted to remove beclovkvma02.bec.net as the node was dead, now I reinstalled this node
and trying to add as 4th node - beclovkvma04.bec.net however since the system UUID is same
Im not able to add the node in ovirt gluster..
9:09 p.m.
New subject: how to forcibly remove dead node from Gluster 3 replica 1 arbiter setup?
As I mentioned in the slack, the safest approach is to:
1. Reduce the volume to replica 1 (there is no need to keep the arbiter until
resynchronization
gluster volume remove-brick VOLUME replica
1 beclovkvma02.bec.net:/data/brick2/brick2 beclovkvma03.bec.net:/data/brick1/brick2 beclovkvma02.bec.net:/data/brick3/brick3
beclovkvma03.bec.net:/data/brick1/brick3 beclovkvma02.bec.net:/data/brick4/brick4
beclovkvma03.bec.net:/data/brick1/brick4 beclovkvma02.bec.net:/data/brick5/brick5
beclovkvma03.bec.net:/data/brick1/brick5 beclovkvma02.bec.net:/data/brick6/brick6
beclovkvma03.bec.net:/data/brick1/brick6 beclovkvma02.bec.net:/data/brick7/brick7
beclovkvma03.bec.net:/data/brick1/brick7 beclovkvma02.bec.net:/data/brick8/brick8
beclovkvma03.bec.net:/data/brick1/brick8 force
Note: I might have missed a brick, so verify that you are selecting all bricks for the
arbiter and beclovkvma02
2. Remove the broken nodegluster peer detach beclovkvma02.bec.net force
3. Add the freshly installed host:gluster peer probe beclovkvma04.bec.net
4. Umount all bricks on the arbiter.Then reformat them:mkfs.xfs -f -i size=512
/path/to/each/arbiter/brick/LV
5. Check if fstab is using UUID and if yes -> update with the /dev/VG/LV or with the
new UUIDs (blkid should help)
6. Mount all bricks on the arbiter - no errors should be reported:mount -a
7. Umount , reformat and remount all bricks on beclovkvma04.bec.net . Don't forget to
check the fstab. 'mount -a' is your first friend
8. Readd the bricks to the volume. Order is important (first 04, then arbiter, 04,
arbiter...)
gluster volume brick-add VOLUME replica 3 arbiter1
beclovkvma04.bec.net:/data/brick2/brick2 beclovkvma03.bec.net:/data/brick1/brick2 beclovkvma04.bec.net:/data/brick3/brick3 beclovkvma03.bec.net:/data/brick1/brick3 beclovkvma04.bec.net:/data/brick4/brick4 beclovkvma03.bec.net:/data/brick1/brick4 beclovkvma04.bec.net:/data/brick5/brick5 beclovkvma03.bec.net:/data/brick1/brick5 beclovkvma04.bec.net:/data/brick6/brick6 beclovkvma03.bec.net:/data/brick1/brick6 beclovkvma04.bec.net:/data/brick7/brick7 beclovkvma03.bec.net:/data/brick1/brick7 beclovkvma04.bec.net:/data/brick8/brick8 beclovkvma03.bec.net:/data/brick1/brick8
9. Trigger the full heal:gluster volume heal VOLUME full
10. If your bricks are high performant and you need to speed up the healing you can
increase these volume settings:
- cluster.shd-max-threads- cluster.shd-wait-qlenght
Best Regards,Strahil Nikolov
On Fri, Nov 12, 2021 at 8:21, dhanaraj.ramesh--- via Users<users(a)ovirt.org> wrote:
wanted to remove beclovkvma02.bec.net as the node was dead, now I reinstalled this node
and trying to add as 4th node - beclovkvma04.bec.net however since the system UUID is same
Im not able to add the node in ovirt gluster..
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10 comments
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participants (3)
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dhanaraj.ramesh＠yahoo.com -
Ritesh Chikatwar -
Strahil Nikolov