On 09/05/2012 01:26 AM, Stefan Schloesser wrote: > my problem with the rolling upgrade is the drbd partition. If you migrate the service its data will move too. If you then restart the cluster and migrate back the data will not be in an upgraded state and thus not match the binary. Hence you can't be sure your service will start on the recently upgraded node with the old data version.
I think if your requirements are zero downtime and a database engine that's not compatible with itself, your only option is to not upgrade. Otherwise one or the other has to go. HTH -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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