Re: An NFS-HA HOWTO anyone? WAS> Re: Stopping NFS, ip address take over, zero-copy NFS for 2.4.21, and misc

[Matt Schillinger <mschilli@vss.fsi.com>]

On Sat, 2003-09-20 at 05:22, ian sison (mailing list) wrote:
> 
> On Fri, 19 Sep 2003 rnews@tasking.nl wrote:
> 
> > Chris Worley <cworley@lnxi.com> wrote:
> > | 2) IP address takeover between NFS servers.
> > |
> > | With NFS stateless, and not running lock servers, I thought a simple IP
> > | address takeover scheme (when an I/O server goes down, another just adds
> > | the failed server's IP address as a virtual interface) would allow
> > | clients to immediately renegotiate with the same IP address pointing to
> > | another NFS server (serving the same partitions).  The take-over is
> > | successful: the clients can communicate with the new I/O server, but I
> > | get "permission denied" (as root or otherwise) on the NFS mounted
> > | partitions most of the time (sometimes it works).
> >
> > You need to migrate the entries in /var/lib/nfs/rmtab to the new
> > machine. Also, when the device number on the new machine differs
> > from the device number on the old machine, you need to use the "fsid"
> > option in /etc/exports, to make sure the file handles don't change.
> 
> This is important information, and it should go into a howto. NFS-HA is a
> very common requirement nowadays, and there's very little information i've
> seen on the net except for the Mission Critical Linux site.
> 
I need to update info on the page, and quite honestly, i think the info
i have is buggy.. (I will update this week), but i have a document
showing how I achieve 'Active-Active' HA NFS over Shared SCSI.. Mainly,
it's by replicating rmtab entries by storing mountpoint specific rmtab
entries on the shared storage mountpoint... 

the address is:

http://chilli.linuxmds.com/~mschilli/NFS/

Bookmark the page, and I promise by mid week, i'll have it updated.. I
will post to the mailing list when the update is complete.

Matt Schillinger
mschilli@vss.fsi.com
> 
> 
> 
> 
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