[ClusterLabs] Antw: Re: Antw: Re: Antw: Re: OCFS2 on cLVM with node waiting for fencing timeout

[Eric Ren]

Hi,

On 10/14/2016 03:17 PM, Ulrich Windl wrote:
>>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 13.10.2016 um 16:49 in Nachricht
> <97fdafc7-7efe-41d8-99fa-20abb20506f6 at redhat.com>:
>> On 10/13/2016 03:36 AM, Ulrich Windl wrote:
>>> That's what I'm talking about: If 1 of 3 nodes is rebooting (or the cluster
>> is split-brain 1:2), the single node CANNOT continue due to lack of quorum,
>> while the remaining two nodes can. Is it still necessary to wait for
>> completion of stonith?
>>
>> If the 2 nodes have working communication with the 1 node, then the 1
>> node will leave the cluster in an orderly way, and fencing will not be
>> involved. In that case, yes, quorum is used to prevent the 1 node from
>> starting services until it rejoins the cluster.
> The $%&/@ problem of a root process having a file open on OCFS prevented the clean unmount of the filesystem. I think newer versions of the RA now even kill root processes.
> Can anybody explain why root processes were excluded before?
@Ken Gaillot
Thanks your explanation on the fencing things.

@Ulrich Windl
I did't try the RAs you mentioned. But I am wondering if the new version of the RA can kill
the root process that is doing IO in D state?

Eric
>
>> However, if the 2 nodes lose communication with the 1 node, they cannot
>> be sure it is functioning well enough to respect quorum. In this case,
>> they have to fence it. DLM has to wait for the fencing to succeed to be
>> sure the 1 node is not messing with shared resources.
>>
>>
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