From: Suhrud Patankar [mailto:suhrudpatankar@gmail.com]
On Tue, May 21, 2019 at 1:42 PM Michel Buijsman <michelb@bit.nl> wrote:
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.
Yes, can imagine problems with statd. Long time back there was some discussion on possibility of getting statd code inside Ganesha. Has this ever considered/tried?
NFSv3 is always going to be a bit tricky because it relies on rpcbind which isn't prepared to give more than one port number. I think these days an NFSv3 mount can work by specifying both the NFS port and the MNT port, but I don’t know if there's a way for the client to specify the NLM port. If we had a custom statd, it could treat each server IP separately and properly make it appear to the client that each server IP is a totally independent server. A custom rpcbind could solve the problem of the NLM port (and NFS and MNT ports to boot)...
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.
I'd love to understand what all the issues were, they may be issues that affect single instance also. Frank
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.
Thanks for the quick response!
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