Hi guys,
I've got a running HA Cluster with shared storage on RHEL 5 on s390x. It
works fine but I've had to do some VM modifications underneath the
covers to adequately implement a safe STONITH package due to RACF
policies and so on.
I'm starting to experiment with RHEL 6 and I think a great solution for
me would be to implement DRBD with Pacemaker and Corosync since I
believe it would release me from the VM modifications that I'd really
like to avoid. I'm having a bit of a difficult time understanding how
DRBD works to be honest. All of the examples show how to set up the
cluster and then create a partition on both nodes for DRBD but I'm
really lacking a deep understanding on how this works and so I'm a bit
confused.
I currently have the cluster built and mysql resource enabled and
working. Regarding the DRBD partition that I create on each node - will
this partition hold a database? For instance, I have 3 databases created
- > wiki, drupal and testDB. Should I create a separate partition on
each node for each one of these databases and insert them into DRBD
config? So in effect I would have 3 separate filesystems /var/lib/wiki,
/var/lib/drupal and /var/lib/testDB ? Or is this DRBD partition a sort
of messaging partition that sits outside the database directories
themselves and handles the transaction messaging to the actual database?
Know what I mean?
-tks
Mike
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