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[Cluster-devel] Re: [NFS] [PATCH 3/4 Revised] NLM - kernel lockd-statd changes



Olaf Kirch wrote:
On Friday 13 April 2007 21:16, Lon Hohberger wrote:
The simplification here is a bit incorrect; we need to be able to handle
a given *set* of size >= 1 IPs which is paired with a *set* of size >= 1
of fsids. The sets are not broken up (that is, we won't be moving file systems between IP addresses or vice-vers), but the number of
IPs:filesystems need not be 1:1.

   * 1 file system, 1 ip address
   * 2 fs, 1 ip
   * 1 ip, 2 fs
   * 18 ip, 42 fs.

So you move a bunch of file systems with a bunch of IPs, and that
information is recorded somewhere. So if you know you're moving
set X, which goes with IPs 1.2.3.4 and 1.2.3.5, you might as well
send notifications from both these IPs to all clients having established
locks on a file system from that set.

I think in term of correctness, it's better to send an SM_NOTIFY
for each IP associated with such a set, anyway.

That's exactly what we have been proposing... :) .. We'll rely heavily on HA callout program to tell us which client uses which (server) floating IP.
To me, it seems the crucial point of information here when monitoring
a client, is which file system (or set of file systems) the client has
accessed.

The summary will be sent out shortly ... sorry - it is a little bit behind schedules due to other issues.

-- Wendy


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