> We've previously used node-based recovery, which is basically what's
> implemented right now in Ganesha. However, for a number of reasons we
> need an IP-based recovery solution. Malahal told me that Redhat wants an
> IP-based solution as well. Soumya (or anyone else), have you been working
> on this? Do you have anything to show yet?

I thought the recovery was IP based already...

There are basically three scenarios of interest:

1. Node goes down and IPs are moved to other nodes
2. Interface on Node goes down and IP is moved to another node
3. Actually there's just two scenarios, because failback when a node or
interface comes back online is just scenario 2...

This means there are three main actions to manage the transfer of state:

1. RELEASE_IP, if an interface goes down, the node that is losing that IP
needs to release state associated with that IP

2. TAKE_IP, whichever node is acquiring an IP address (whether from a failed
node, failed interface, or failback) must notify v3 clients and then accept
reclaims from the appropriate v3 and v4 cleints.

3. Somewhere in there all nodes need to cooperate to enforce grace period.

Frank


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