2 Crucible Instances on 1 Database

SomnathK

We are trying to explore resiliency options for Crucible We are looking at the following configuration 2 Instances in Hot Warm Mode 2nd Crucible Instance will not be ópen for users We will keep it running as we want the Fisheye Cache to updated 2nd Instance will be configured with same data In case of primary node failure we would failover to 2nd node Thoughts?

Piotr Swiecicki

Hi Somnath,

I am assuming you want to configure both instances to connect to a single shared database, right? Otherwise they would not share reviews data etc.

I don't think it is a good idea to keep hot failover server connected to the same database. That would result in duplicate emails being sent with review reminders for example. Also, some of the sequences like review perm id generator are kept in memory, so keeping two instances connected to the same database would result in review perm id collisions. What about keeping it as a cold failover server though? You can keep it fully configured and ready for start, but not actually started until the primary server crashed.

Finally, you also need to ensure file system is synchronised between two servers. Bear in mind NFS is not supported, so you may want to set up some rsync synchronisation to run periodically from primary node to the failover one. And obviously such synchronisation would need to be run again if primary server crashed, assuming you can still access its file systems.

Hope that helps,
Piotr