Can I safely assume that the only difference between a ro node and a rw node in
the same cluster is the "ro" or "rw" switch in /etc/fstab upon mount (we are
using Redhat)? If a ro node crashes, will it be fenced off the cluster just
like a rw node causing a brief jitter? Any doc that you can refer me to for
details? Thank you for your help!
Billy
--- On Sun, 12/6/09, Sunil Mushran <sunil.mush...@oracle.com> wrote:
> From: Sunil Mushran <sunil.mush...@oracle.com>
> Subject: Re: [Ocfs2-users] mixed mode mount options?
> To: "Billy" <lfl200...@yahoo.com>
> Cc: "ocfs2-users@oss.oracle.com" <ocfs2-users@oss.oracle.com>
> Date: Sunday, December 6, 2009, 12:48 PM
> The node doing the ro mount is a full
> member of the cluster. Yes, it will participate in cluster
> activities including replaying a dead node's journal, etc.
> So it is not the spectator node that gfs2, I believe, has.
> I've never quite understood how a spectator node can
> maintain cache coherencies.... other than by disabling all
> caches and hitting disk on every read. Not sure if gfs2 does
> that or what level of coherency it guarantees the user.
>
>
> On Dec 6, 2009, at 9:14 AM, Billy <lfl200...@yahoo.com>
> wrote:
>
> > Thank you Sunil!
> >
> > Is there any difference in setup for a ro node vs. rw
> nodes? In other words, will a ro node be a member of
> the cluster and sending/receiving heartbeat? I would
> image a ro node should not affect the cluster in any way
> should the node fail/crash, but I am not sure if it is
> correct.
> >
> > Billy
> >
> > --- On Fri, 12/4/09, Sunil Mushran <sunil.mush...@oracle.com>
> wrote:
> >
> >> From: Sunil Mushran <sunil.mush...@oracle.com>
> >> Subject: Re: [Ocfs2-users] mixed mode mount
> options?
> >> To: "Billy" <lfl200...@yahoo.com>
> >> Cc: ocfs2-users@oss.oracle.com
> >> Date: Friday, December 4, 2009, 5:11 PM
> >> Billy wrote:
> >>> Does anyone know if OCFS2 supports mixed
> mounts?
> >> We have 4-node OCFS2 cluster, is it possible for
> one node to
> >> mount read only and the other 3 nodes mount -rw on
> a same
> >> volume?
> >>>
> >>
> >> Sure.
> >>
> >
> >
> >
>
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