How To Stop and Start Primo to minimize failover
- Article Type: General
- Product: Primo
Desired Outcome/Goal:
To determine the proper Primo Shutdown and Start-up sequence that will minimize failover conditions, especially for MFE N+1 topologies.
Users with proper server access will occasionally unknowingly trigger a Primo failover (either FE or SE) while attempting to stop or restart Primo components.
If this happens and components are stopped before the failover is actually completed, problems can occur when Primo is restarted.
Procedure:
Shutdown:
1. Stop BE
2. Stop FEs
3. Stop SEs
4. Stop Apache (if needed)
5. Stop DB (if needed)
Startup:
1. Start DB
2. Start Apache
3. Start FEs
4. Start SEs
5. Start BE
Additional Information
Explanation:
BE controls FE failover.
--This means when BE is stopped first, then FEs can be stopped in any order without risk of causing FE failover.
FEs (whichever FE is MFE Primary) control SE failover.
--This means if FEs are stopped next, then finally SEs can be stopped in any order without risk of causing an SE failover.
For example:
If a different sequence is used in an MFE N+1 environment,
* stopping an SE with a slice first, while FEs are running, will cause the SE indexer to failover to replace that missing slice. Slices often take several minutes to completely load before becoming searchable.
* stopping the FE that is MFE Primary while the BE is running, will cause the Secondary FE to failover and become the MFE Primary.
Conclusion:
During a shutdown it is very common to stop the components quickly, especially with SEs, before the failover process is completed, and this can cause problems.
This sequence can also be applied to other smaller or simpler topologies as well.
Category: Primo
Subject: Primo
- Article last edited: 11/6/2014