Thanks Ian.
>From the Solaris mount_nfs man page:
Replicated file systems and failover
resource can list multiple read-only file systems to
be used to provide data. These file systems should
contain equivalent directory structures and identical
files. It is also recommended that they be created by
a utility such as rdist(1). The file systems may be
specified either with a comma-separated list of
host:/pathname entries and/or NFS URL entries, or with
a comma -separated list of hosts, if all file system
names are the same. If multiple file systems are named
and the first server in the list is down, failover
will use the next alternate server to access files. If
the read-only option is not chosen, replication will
be disabled. File access will block on the original if
NFS locks are active for that file.
Wayne
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Monday, November 15, 2004 8:34 AM
To: Keeler, Wayne T (Wayne)
Cc: [EMAIL PROTECTED]
Subject: Re: [autofs] Replicated hosts in autofs
On Fri, 12 Nov 2004, Keeler, Wayne T (Wayne) wrote:
>
> Hi,
>
> I have read many threads regarding replicated hosts for autofs v3 and
> v4.
>
> Here is my scenario:
>
> On a linux host (Opteron running RHEL 3 WS kernel 2.4.21-20.ELsmp, I
> have the following automount configured:
>
> mountpoint -fstype=nfs,-proto=tcp,ro host1,host2:/tmp/ro
>
> The goal in my implementation is that after the initial mount occurs
to
> host1 or host2, if that particular host fails, nfs will pick up the
> mount on the alternate host. Note that since both mount points are
read
> only, this serves as a lower cost, higher availability solution. This
> works on Solaris.
Nop. Not available in Linux.
>
> I have had no success with this on Linux. It seems that the
replication
> only works on the initial mount/rpc call. Once the initial mount
occurs,
> it doesn't appear there is any fail-over capability.
Yep. I believe you are correct.
>
> I have even installed RedHat's Beta version of E4 (kernel
> 2.6.9-1.648_ELsmp). The result is the same. If I crash the machine
that
> originally had the mount-point, the end result is a hung mount and
> fail-over never occurs.
>
> I can't seem to find any information that indicates that this should
or
> should not work by design.
>
> Can someone please definitively tell me if the capability I am seeking
> is available via the autofs supplied by RedHat in Enterprise 3?
I don't think that this is practicle to do in autofs.
This is the source of statements like "this functionality belongs in NFS
or mount". The limited implementation in autofs is there because of the
lack of it in NFS.
The question then is "does autofs or mount/NFS handle this in Solaris"?
Mike?
Ian
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