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

[Simone Tiraboschi]

On Mon, Jan 23, 2017 at 6:51 PM, Claude Duropcher <
claude.duroc...@cptaq.gouv.qc.ca> wrote:

> 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?
>

No, not really: they are different and global is not superset of local.
global maintenance mode is needed if you need to do maintenance on the
engine VM, no host will restart the engine VM. local maintenance mode is if
you need to do maintenance or upgrade a single host.



>
>-
>
>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.duroc...@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.
>
>
>
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
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Re: [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 
> 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.

___
Users mailing list
Users@ovirt.org 
http://lists.ovirt.org/mailman/listinfo/users





___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users

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

[Simone Tiraboschi]

On Mon, Jan 23, 2017 at 4:20 PM, Claude Duropcher <
claude.duroc...@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.



> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users

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

[Claude Duropcher]

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.


___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users