[Ocfs2-users] Urgent :: 11i on OCFS2.. I mean APPL_TOP, COMMON_TOP etc..

[Sunil Mushran]

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 <Alexei_Roudnev at exigengroup.com>/* 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:lfreitas34 at yahoo.com>
>         *To:* PRABHAKAR.TAMMINA at ORACLE.COM
>         <mailto:PRABHAKAR.TAMMINA at ORACLE.COM> ;
>         ocfs2-users at oss.oracle.com <mailto:ocfs2-users at oss.oracle.com>
>         *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
>
>
>         */PRABHAKAR.TAMMINA at ORACLE.COM/* 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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