NFS Client Failover

2007-12-25 11:55:00

My original question:

I'm curious about the NFS Client Failover that Sun introduced with

Solaris 2.6. I have several questions about it. I've searched various

Sun sites, the archives, and the Internet in general, and can't seem to

find much helpful information about NFS client failover. With that in

mind, if anyone has experience using the feature and can provide insight,

I'd be extremely grateful.

1) The mount_nfs(1m) man page specifies that failover should only be

used for read-only mounts, using replicated filesystems. Does anyone

know what happens if you mount a filesystem read-write, but specify

multiple NFS servers, as is the case when you use the client failover

feature? Specifically, I'm asking whether the client ignores the

multiple servers, or will attempt to perform the failover even though

the filesystem is mounted read-write.

2) Can the NFS client failover feature be used to handle failure of a

NIC in one NFS server? In other words, if I have one server with

multiple network interfaces, can I specify both interfaces of that

server when I mount the filesystem?

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To summarize, it seems that the OS is smart enough not to attempt

dynamic failover if the filesystem is mounted read-write. It will,

however, use the multiply defined hostnames at mount time, and if the

first listed server is unavailable, it will try the next in the list.

The answer to question 2) was, yes, that this can be done, obviously

with the restriction that the filesystem must be mounted read-only.

Thanks to the following people for their responses:

Casper Dik

Christophe Dupre

Clifford Thurber

Darren Dunham

David Foster

--
Charles Brian Hill
brian@doodlabs.com

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