On Thu, Oct 9, 2014 at 11:43 PM, John R Pierce <pierce at hogranch.com> wrote: >> >> Most people forget that DRDB is a 'clustered' storage that creates a new >> block device on top of existing block devices, over the network. >> >> There are issues like SPLIT BRAIN and a possible data inconsistency, >> should >> there be multiple network timeouts, congestions (since it is all network >> based) etc. This may not be the best solution for your problem! > > > those are potential issues with ANY high availability clustering solution > that need to be carefully engineered around. HA clusters commonly use > fencing technology to prevent split brain, dedicated network adapters just > for replication, and redundant connections for status monitoring, etc. > And you still need backups. Other things besides hardware failures can wipe your data and with mirrors/clusters, software or operator errors will take all the copies at once. -- Les Mikesell lesmikesell at gmail.com