From claude.durocher at cptaq.gouv.qc.ca Mon Jan 23 17:51:18 2017 Content-Type: multipart/mixed; boundary="===============1683102759331070242==" MIME-Version: 1.0 From: Claude Duropcher To: users at ovirt.org Subject: Re: [ovirt-users] Update NFS storage of the HE server Date: Mon, 23 Jan 2017 12:51:15 -0500 Message-ID: In-Reply-To: CAN8-ONr-24f1dp9UzSc6+oDmfdj2Fm+o7vdCM7ZMjagXszQk3w@mail.gmail.com --===============1683102759331070242== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------A983AC3C9C3F782E21725053 Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: quoted-printable Simone, thanks for replying, According to the documentation, global mode seems to be a superset of=3D20 local mode. Does setting to local mode maintenance on all hosts in the=3D20 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 =3DC3=3DA0 12:13, Simone Tiraboschi a =3DC3=3DA9crit : > > > On Mon, Jan 23, 2017 at 4:20 PM, Claude Duropcher=3D20 > > 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=3D20 > hosted-engine for all the time; depending on different factors,=3D20 > sanlock will fail updating the hosted-engine lease ans this can bring=3D20 > the watchdog to reboot the host. > Setting also local maintenance mode on the involved hosts is a good ide= =3D a. > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > > --------------A983AC3C9C3F782E21725053 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable

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 =3DC3=3DA0 12:13, Simone Tiraboschi a =3DC3=3DA9crit=3DC2=3DA0:

On Mon, Jan 23, 2017 at 4:20 PM, Claude Duropcher <claude.durocher(a)cptaq.gouv.qc.ca&= gt=3D ; 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.

=3DC2=3DA0

_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt= .o=3D rg/mailman/listinfo/users

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