- **status**: accepted --> review
---
** [tickets:#3058] amfd: add support for dynamically modifying saAmfRank of
SaAmfSIRankedSU**
**Status:** review
**Milestone:** 5.19.07
**Created:** Mon Jul 15, 2019 08:18 PM UTC by Alex Jones
**Last Updated:** Mon Jul 15, 2019 08:18 PM UTC
**Owner:** Alex Jones
Add support for modifying saAmfRank of SaAmfSIRankedSU class.
This is useful in the following case. You have two geographically separated
sites. You want to have the concept of an active site, and a standby site. You
also have 2 nodes in each site (4 total), because you want to always fail to
the other local node if possible. Only if you can't fail locally do you want to
fail to the other site.
This can be accomplished using an N-way service group across the two sites. You
can configure 1 SI which is active on one node and standby on the other 3. You
can setup the 2 SUs in site A, one on each node, to have the same rank in
SaAmfSIRankedSU objects. You set up the other 2 SUs at the other site, one on
each node, to have a lower rank. This way failovers will always have local
preference.
When a site failover occurs, this is where modifying saAmfRank is needed. Now
you need to change the rank of the SUs in the previously active site, so that
AMF doesn't fail back to the other site before trying to fail locally.
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