800xA Event Storage and Alarm Manager Storage Settings
1. On an 800xA system I saw that the engineering company setting up the version 6.1 800xA system with Harmony Connect (only) had chosen these default settings for Event Storage:
Files = 3, Storage = 20,000,000, Messages = 10,000 and Max Files = 10. No storage categories had been changed from the default. I would suggest that 1. the event categories appropriate for Harmony should be have their storage space increased and 2. That the default should be changed so that Max Files = 5 and Storage = five times the system default value (only). For the high rate Harmony storage categories Messages should be set t0 50,000. Comments?
2. The same system has Alarm Manager storage set to 50,000. This does appear excessive at normal operation but maybe it is set up to handle alarm storms at shutdowns? I have suggested that a high value may affect system performance in a negative way. Comments?
Voted best answer
- The proposed change is within the performance envelope of Event Storage and documented in the user documentation. Adding 5x more files when increasing from 10k to 50k events sounds like a good plan.
Hint: there are performance gains to make by using proper filtering The Common Event List Filter embraces most event categories and is hence one of the slowest you can use in a customized configuration. Don't include categories not expected among the objects you search.
- Increasing the Alarm Manager storage beyond 10k is not documented. 10k should suffice, even for larger systems if well tuned.
There are bulletins and alerts released on the Alarm Manager and potential performance issues when using certain options like Tabbed Navigation and having certain geometry and size of the system.
Educate the end users to not use alarm lists to view "alarm history", use event lists. Please note the additional optional events you can select to generate, e.g. on acknowledge and disabling.
Hint: set system alarm categories with a small (e.g. 500) storage to allow the main storage to cater for process alarms, only. Never enable Make new alarm each time a condition gets active.