[ClusterLabs] DRBD or SAN ?

[emmanuel segura]

yes, if you are using drbd in master/slave, first promote the resource to
master and then start vm on the node, if you use drbd in multimaster, only
start the vm when drbd is started.

Use SAN, with multipath.

2017-07-18 16:34 GMT+02:00 Lentes, Bernd <bernd.lentes at helmholtz-muenchen.de
>:

>
>
> ----- On Jul 17, 2017, at 11:51 AM, Bernd Lentes bernd.lentes at helmholtz-
> muenchen.de wrote:
>
> > Hi,
> >
> > i established a two node cluster with two HP servers and SLES 11 SP4.
> I'd like
> > to start now with a test period. Resources are virtual machines. The vm's
> > reside on a FC SAN. The SAN has two power supplies, two storage
> controller, two
> > network interfaces for configuration. Each storage controller has two FC
> > connectors. On each server i have one FC controller with two connectors
> in a
> > multipath configuration. Each connector from the SAN controller inside
> the
> > server is connected to a different storage controller from the SAN. But
> isn't a
> > SAN, despite all that redundancy, a SPOF ?
> > I'm asking myself if a DRBD configuration wouldn't be more redundant and
> high
> > available. There i have two completely independent instances of the vm.
> > We have one web application with a databse which is really crucial for
> us.
> > Downtime should be maximum one or two hours, if longer we run in trouble.
> > Is DRBD in conjuction with a database (MySQL or Postgres) possible ?
> >
> >
> > Bernd
> >
>
> Is with DRBD and Virtual Machines live migration possible ?
>
>
> Bernd
>
>
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