[Gluster-users] URGENT - Cheat on quorum

[Ravishankar N]

On 05/22/2017 03:11 AM, W Kern wrote:
>
> So I am experimenting with shards using a couple VMs and decided to 
> test his scenario (i.e. only one node available on a simple 2 node + 1 
> arbiter replicated/sharded volume use 3.10.1 on Cent7.3)
>
> I setup a VM testbed. Then verified everything including the sharding 
> works and then shutdown nodes 2 and 3 (the arbiter).
>
> As expected I got a quorum error on the mount.
>
> So I tried
>
> gluster volume set VOL cluster.quorum-type none
>
> from the remaining 'working' node1 and it simply responds with
>
> "volume set: failed: Quorum not met. Volume operation not allowed"
>
> how do you FORCE gluster to ignore the quorum in such a situation?
>
You probably also have server quorum enabled (cluster.server-quorum-type 
= server). Server quorum enforcement does not allow modifying volume 
options or other actions like peer probing/detaching if server quorum is 
not met.

Also, don't disable client quorum for arbiter volumes or you will end up 
corrupting the files. For instance, if the arbiter brick was the only 
one that is up, and you disabled client quorum, then a writev from the 
application will get a success but nothing will ever get written on-disk 
on the arbiter brick.

-Ravi
>
> I tried stopping the volume and even rebooting node1 and still get the 
> error (And of course the volume wont start for the same reason)
>
> -WK
>
>
> On 5/18/2017 7:41 AM, Ravishankar N wrote:
>> On 05/18/2017 07:18 PM, lemonnierk at ulrar.net wrote:
>>> Hi,
>>>
>>>
>>> We are having huge hardware issues (oh joy ..) with RAID cards.
>>> On a replica 3 volume, we have 2 nodes down. Can we somehow tell
>>> gluster that it's quorum is 1, to get some amount of service back
>>> while we try to fix the other nodes or install new ones ?
>> If you know what you are getting into, then `gluster v set <volname> 
>> cluster.quorum-type none` should give you the desired result, i.e. 
>> allow write access to the volume.
>>> Thanks
>>>
>>>
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>>> Gluster-users at gluster.org
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>>
>>
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>
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