That's fine. The only limitation is how the file is updated.
In 1.2, one cannot create a shared writeable mmap. But one
is free to use write() and have shared readonly mmaps.
Patch to address shared writeable mmap has been checked into
mainline. It will be available in 2.6.23 and with ocfs2 1.4.
Luis Freitas wrote:
Anyone have coments on the shared mmap?
What could happen if a file is mmaped by say, 3000 different processes
in a 4 node cluster, and someone went there and changed its contents?
This is a possible situation on a large production APPS environment,
or any forms based application.
Regards,
Luis
*/Alexei_Roudnev <[EMAIL PROTECTED]>/* wrote:
It's really a good question. We should know _which exactly
combinations are used internally_. (OS, File System, NAS/SAN).
In reality therse particular combinations are most stable and
preffered ones - no matter what is _officially certified_.
----- Original Message -----
*From:* Luis Freitas <mailto:[EMAIL PROTECTED]>
*To:* [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> ;
[email protected] <mailto:[email protected]>
*Sent:* Wednesday, August 22, 2007 6:46 PM
*Subject:* Re: [Ocfs2-users] Urgent :: 11i on OCFS2.. I mean
APPL_TOP,COMMON_TOP etc..
Prabhakar,
This post is only my personal opinion. I do not work for
Oracle nor have any close contact with the support and
development groups. But I never heard of anyone using this
combination.
This is kind of a gray area, since Oracle usually
provides support for OCFS2 in conjunction with RAC database.
The APPS people is a different group internally at Oracle, so
even if this is officially supported you could get into
situations where the support analysts start to redirect the
TAR between these groups, or could argue that since the issues
are not related to Oracle Database or Oracle database binaries
they would not fix it.
I would not do it unless with a very large customer that
could escalate any issues to get a fast resolution with
support. It probably is better to get a NAS storage and map it
using NFS.
That said since it is supported for the database binaries,
there should not be immediate problems with other files. The
FAQ about shared APPL_TOP on metalink says that any disk
sharing technology can be used.
One thing that comes to my attention is that Oracle Forms
uses memory mapped files extensively. I dont know how
completelly this is implemented on OCFS2 and if it works
well. Anyone can comment on this? There are some posts on
this list about problems with shared mmap.
Regards,
Luis
*/[EMAIL PROTECTED]/* wrote:
All,
Is Shared APPL_TOP certified with 11i on OCFS2? Please
send me the information as soon as possible..
We have two RAC nodes on ASM file system and one middle
tier right now. Now want to setup Shared APPL_TOP so need
your help whether this is a certied with OCFS2 or not.
OS is SUSE 9 SP3.
Regards,
Prabhakar Tammina.
(614)598-3487(cell).
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