[NFS-Ganesha-Devel] Re: Question about recovery in cluster envirnment
On 4/2/19 9:07 AM, fanzi2009(a)hotmail.com wrote:
Thanks for Daniel and Soumya!
Putting whole cluster into grace period, will it cause performance issue?
Is it OK that we save all the session informations into backend. When ServerA crashed and
client connect ServerB, ServerB can resume session from backend including open and locking
resource.
You have to do that, and you also have to put the cluster into Grace.
When the client connects to the new server, it will re-acquire any state
it had before, and so the new server needs to know what clients can do this.
As I said, NFS is not a great clustered protocol. If you have multiple
servers serving the same data, and any of them goes down, you need to
put them all into Grace. This is to keep any *other* clients from
getting locks that should belong to the clients that were connected to
the down server. Yes, this will have performance issues, but it's the
only way to avoid data corruption.
Daniel