[NFS-Ganesha-Devel] Re: Two Ganesha processes on one server

On Tue, May 21, 2019 at 12:47:32PM +0530, Suhrud Patankar wrote: > We want to run two separate Ganesha processes on one node. (Using > 2.7.1 code level) > > The config params "Bind_Addr" and "Dbus_Name_Prefix" work as expected > to isolate the two instances. > So we have each process binding to separate network interface and gets > its own DBus bus-name. > They need to serve different file systems, so not much worry about the > cache consistency between them. > > Is there any specific area we need to worry about? Has anyone tried > similar setup? Yes, I tried it in a cluster of storage gateways with one ganesha daemon per virtual ip and automatic failover via ctdb, against a ceph backend. Short version: Locking will be a problem. (It's a problem to begin with, but beyond that.) NFSv3 locking is hopeless, the rpc daemons are not aware of multiple processes, they will mess each other up and no amount of namespacing or containerizing will convince it otherwise.

NFSv4 depends on the client. We had all kinds of vague issues depending on type of workload. A vmware client had no apparent problems whatsoever, others did. I built this on ganesha 2.7.1. Currently running 2.7.3 on a few test vips but we couldn't get it stable enough for production use. There was the odd crashing ganesha daemon if I was really hammering it, but other than the locking issue it was looking pretty good. Performed well, too.