[ClusterLabs] DRBD or SAN ?

[Lentes, Bernd]

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



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Bernd Lentes 

Systemadministration 
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