[ClusterLabs] DRBD or SAN ?

Lentes, Bernd bernd.lentes at helmholtz-muenchen.de
Tue Jul 18 10:34:50 EDT 2017

----- 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 ?


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