[ovirt-users] Hosted engine multipath iscsi

[Simone Tiraboschi]

----- Original Message -----
> From: "wodel youchi" <wodel.youchi at gmail.com>
> To: "Simone Tiraboschi" <stirabos at redhat.com>
> Cc: "Baptiste Agasse" <baptiste.agasse at lyra-network.com>, "Nir Soffer" <nsoffer at redhat.com>, "users"
> <users at ovirt.org>
> Sent: Wednesday, March 25, 2015 2:59:58 PM
> Subject: Re: [ovirt-users] Hosted engine multipath iscsi
> 
> Hi,
> 
> I am planning an ovirt hosted-engine installation with two nodes and an
> iSCSI SAN for the engine and VMs and NFS for ISO and Export domains, on
> another NAS.
> 
> The iSCSI SAN have two controllers, each one have two NICs at 1Gb/s, and I
> was planning to use a bond manually configured (two NICs) on
> hypervisors/nodes, so I'll end up with 4 paths.
> 
> - Creating a bond is it a good idea? or do I have to use the node NICs
> separately as in the link mentioned earlier?

Creating a iSCSI bond is indeed the recommended way to use iSCSI multipathing with oVirt
http://www.ovirt.org/Feature/iSCSI-Multipath#iSCSI_Bond_behaviour
But it relies on oVirt logical network that are still not available when you are deploying hosted-engine and with oVirt 3.5 you cannot than edit the hosted-engine storage domain.
A manually configured bond should work but than is not directly managed by the engine for additional hosts.

> - If I'll use a bond, will it survive the engine's installation?

hosted-engine is generally working with bonded interface and they generally survive but honestly I never directly tried deploying hosted-engine on iSCSI over bonded interface.
Please report us if you find any issue with that.

> - After the engine's installation, the link(s)/path(s) used to connect to
> the SAN storage will also be used to connect to the NAS, this will
> constitute a storage network, this network will be mandatory so I can't
> create an iSCSI bond on top of it. Will the multipath be configured
> automatically by the engine's installation on all hypervisors/nodes?

I think no, currently you cannot edit the hosted engine storage domain from the engine to configure the iSCSI bond involving another logical network.
We are working on that for 3.6

> thanks in advance.
> 
> 2015-03-24 10:30 GMT+01:00 Simone Tiraboschi <stirabos at redhat.com>:
> 
> >
> >
> > ----- Original Message -----
> > > From: "Baptiste Agasse" <baptiste.agasse at lyra-network.com>
> > > To: "users" <users at ovirt.org>
> > > Sent: Tuesday, March 24, 2015 10:12:36 AM
> > > Subject: [ovirt-users] Hosted engine multipath iscsi
> > >
> > > Hi all,
> > >
> > > I'm currently testing ovirt 3.5 on centos 7, with hosted engine on iscsi
> > > equallogic SAN.. It's running fine, i've configured multipath through the
> > > engine (http://www.ovirt.org/Feature/iSCSI-Multipath) for VMs storage
> > but i
> > > didn't find any documentation on hosted engine iscsi multipath. There is
> > a
> > > way to configure iscsi multipath for the engine storage ?
> >
> > In 3.5 is not directly supported from assisted setup.
> > Basically you have to manually pre-connect the storage on each involved
> > host and manually persist that configuration.
> >
> > You can find some hint there:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1193961#c2
> >
> > Adding Nir to double check it.
> >
> >
> > > Have a nice day.
> > >
> > > Regards.
> > >
> > > --
> > > Baptiste
> > > _______________________________________________
> > > Users mailing list
> > > Users at ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/users
> > >
> > _______________________________________________
> > Users mailing list
> > Users at ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
> >
>