[Ocfs2-devel] Global heartbeat - drop#1

[Sunil Mushran]

If the io stack on a non-hb device fails, the apps will start getting
EIOs. Possibly leading to application death. But the system will stay
up.

The dlm domain should remain available.

One case I can see happening is if the journal op fail (say commit
triggered by downconvert). In that case, the fs will fence the box.

Do you have a specific example?

On 07/28/2010 07:45 AM, Wengang Wang wrote:
> Hi Sunil,
>
> The global heartbeat also introduce a difference comparing with local heart.
> With the ghb, what if the non-heartbeat ocfs2 volume(s) fail(s)? Say some lower
> layer(raid/disk-driver) become unhappy to work anymore. In case, no failover
> since no self-fence I think. So it could cause the domain in question
> unavailable(finally), isn't it? With the original lhb scheme, no such problem.
> Is there a solution?
>
> regards,
> wengang.
>
> On 10-07-23 16:55, Sunil Mushran wrote:
>    
>> This is the first drop of the global heartbeat patches for ocfs2/kernel.
>>
>> The first few patches add support for heartbeat mode in sysfs, the new
>> incompat clusterinfo flag and the new mount option heartbeat=global.
>>
>> 0001-ocfs2-cluster-Add-heartbeat-mode-configfs-parameter.patch
>> 0002-ocfs2-Add-an-incompat-feature-flag-OCFS2_FEATURE_INC.patch
>> 0003-ocfs2-Add-support-for-heartbeat-global-mount-option.patch
>> 0004-ocfs2-dlm-Expose-dlm_protocol-in-dlm_state.patch
>>
>> The next few patches enhance the join domain protocol to get the list
>> of configured nodes and heartbeating regions to ensure that all nodes
>> in the cluster have the same view of the cluster.
>>
>> 0005-ocfs2-cluster-Get-all-heartbeat-regions.patch
>> 0006-ocfs2-dlm-Add-message-DLM_QUERY_HBREGION.patch
>> 0007-ocfs2-Print-message-if-user-mounts-without-starting-.patch
>> 0008-ocfs2-dlm-Add-message-DLM_QUERY_NODEINFO.patch
>>
>> The one known missing bit concerns quorum calculation. I am still
>> working on it.
>>
>> http://oss.oracle.com/osswiki/OCFS2/DesignDocs/NewGlobalHeartbeat
>>
>> Thanks
>> Sunil
>>
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