[ovirt-users] Update NFS storage of the HE server

[Claude Duropcher]

Simone, thanks for replying,

According to the documentation, global mode seems to be a superset of 
local mode. Does setting to local mode maintenance on all hosts in the 
cluster really bring any benefits?

  *

    |global| - All high-availability agents in the cluster are disabled
    from monitoring the state of the engine virtual machine. The global
    maintenance mode must be applied for any setup or upgrade operations
    that require the engine to be stopped, such as upgrading to a later
    version of oVirt.

  *

    |local| - The high-availability agent on the host issuing the
    command is disabled from monitoring the state of the engine virtual
    machine. The host is exempt from hosting the engine virtual machine
    while in local maintenance mode; if hosting the engine virtual
    machine when placed into this mode, the engine will be migrated to
    another host, provided there is a suitable contender. The local
    maintenance mode is recommended when applying system changes or
    updates to the host.

Le 2017-01-23 à 12:13, Simone Tiraboschi a écrit :
>
>
> On Mon, Jan 23, 2017 at 4:20 PM, Claude Duropcher 
> <claude.durocher at cptaq.gouv.qc.ca 
> <mailto:claude.durocher at cptaq.gouv.qc.ca>> wrote:
>
>     Hi,
>
>     We need to update/reboot the NFS server on wich the hosted engine
>     is installed. This server also hosts a couple of extra storage
>     domains (ISO, Export and a iScsi domain). I'm wondering if this
>     procedure is complete for an oVirt 4.0 installation :
>
>     1-set the environment to global maintenance
>
>     2-set the extra domains to maintenance mode
>
>     3-shutdown the hosted engine
>
>     4-update/reboot the storage server
>
>     5-reboot the hosted engine
>
>     6-reactivate extra domains
>
>     7-disable global maintenance mode
>
>     I'm wondering what's happening after step 4 and how ovirt will
>     react when the NFS storage disapear and come back.
>
>
> ovirt-ha-agent will try to reconnect the shared storage if 
> hosted-engine for all the time; depending on different factors, 
> sanlock will fail updating the hosted-engine lease ans this can bring 
> the watchdog to reboot the host.
> Setting also local maintenance mode on the involved hosts is a good idea.
>
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