[Ocfs-users] OCFS write/read across 2 nodes

[Dermot Reynolds]

I tried this with version 2 of ocfs and the same thing happens.

If this is not a bug then I'm curious as to how the filesystem can be used
for non datafiles?
I am assuming here that if I modify a config file on an ocfs on node A then
I should see a modified version of the file on node B??

For now this is not an issue for me but I would like some mechanism to
validate that my storage/ocfs is setup correctly between node A and B
without having to perform a database install.  Do you know of an easy way to
do this?

Thanks
Dermot


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-----Original Message-----
From: wim.coekaerts at oracle.com [mailto:wim.coekaerts at oracle.com]
Sent: 08 June 2004 18:53
To: Sunil Mushran
Cc: Dermot Reynolds; ocfs-users at oss.oracle.com
Subject: Re: [Ocfs-users] OCFS write/read across 2 nodes


eh this has ntohing to do with shared mmap

we should have actually killed off the pages after close of the cat, so
this seems to still be a problem,

this is a bug imo . we re supposed to invalidate buffers on close

On Tue, Jun 08, 2004 at 10:04:33AM -0700, Sunil Mushran wrote:
> Yes. ocfs does not supported shared mmap. So what's happening is that
> when you do the cat on node B in t1, the kernel does not read from the
> disk, just from the buffer cache. odirect reads will read the correct
> data.
>
> On Tue, 2004-06-08 at 05:20, Dermot Reynolds wrote:
> > Hi,
> >
> > If I have ocfs on 2 nodes should I be able to do the following:
> >
> > t=0
> >     Node A
> >         echo "1" > /ocfsmount/a
> >
> >     Node B
> >         cat /ocfsmount/a
> >
> > >>>>Question 1: At this point should I see "1"?
> >
> > t=1
> >     Node A
> >         echo "2" > /ocfsmount/a
> >
> >     Node B
> >         cat /ocfsmount/a
> >
> > >>>>Question 2: At this point should I see "2"?
> >
> > The problem is that at t=1 I am still seeing "1", however when I run
> > ocfstool on node B I can see "2".
> >
> > Assuming that this is correct behaviour this must imply that Oracle
> > writes and reads to/from the filesystem in a different manner.
> > Is this where o_direct comes in?
> >
> > Thanks
> > Dermot
> >
> >
> >
> >
> > ______________________________________________________________________
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> > Ocfs-users at oss.oracle.com
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