Discussion:
Oracle 18c grid infrastructure installation using dNFS as shared storage??
Rakesh Ra
2018-11-19 17:41:28 UTC
Permalink
All,

18c installation guides is not clear about whether we can install grid
infrastructure on dNFS ?? Is that possible?? All I see in the guide is
about ASM?? Is it mandatory to have ASM??

Thanks,
Rakesh RA
Rakesh Ra
2018-11-19 18:20:09 UTC
Permalink
Hmmm I just read the below where in it states ASM is mandatory to store
voting files and ocr... I think this will be challenge for companies who
rely on NFS highly..

https://community.oracle.com/thread/4058349
Post by Rakesh Ra
All,
18c installation guides is not clear about whether we can install grid
infrastructure on dNFS ?? Is that possible?? All I see in the guide is
about ASM?? Is it mandatory to have ASM??
Thanks,
Rakesh RA
n***@gmail.com
2018-11-19 19:21:34 UTC
Permalink
It is perfectly possible to create an ASM disk group on top of ASM. I
consider this daft of course, but still.
Post by Rakesh Ra
Hmmm I just read the below where in it states ASM is mandatory to store
voting files and ocr... I think this will be challenge for companies who
rely on NFS highly..
https://community.oracle.com/thread/4058349
Post by Rakesh Ra
All,
18c installation guides is not clear about whether we can install grid
infrastructure on dNFS ?? Is that possible?? All I see in the guide is
about ASM?? Is it mandatory to have ASM??
Thanks,
Rakesh RA
Tanel Poder
2018-11-19 20:07:27 UTC
Permalink
Niall, I think you meant having ASM disk groups stored on *NFS* here.

IIRC it's supported from 12.2 onwards and previously could be achieved by
setting (in an unsupported way) by setting an undocumented parameter. It
needed _asm_allow_only_raw_disks=false I think.

Tanel
Post by n***@gmail.com
It is perfectly possible to create an ASM disk group on top of ASM. I
consider this daft of course, but still.
Post by Rakesh Ra
Hmmm I just read the below where in it states ASM is mandatory to store
voting files and ocr... I think this will be challenge for companies who
rely on NFS highly..
https://community.oracle.com/thread/4058349
Post by Rakesh Ra
All,
18c installation guides is not clear about whether we can install grid
infrastructure on dNFS ?? Is that possible?? All I see in the guide is
about ASM?? Is it mandatory to have ASM??
Thanks,
Rakesh RA
n***@gmail.com
2018-11-19 20:19:37 UTC
Permalink
---------- Forwarded message ---------
From: <***@gmail.com>
Date: Mon, 19 Nov 2018, 20:19
Subject: Re: Oracle 18c grid infrastructure installation using dNFS as
shared storage??
To: Tanel Poder <***@tanelpoder.com>


I did. Read into the typo the degree to which I think this a good idea!
Post by Tanel Poder
Niall, I think you meant having ASM disk groups stored on *NFS* here.
IIRC it's supported from 12.2 onwards and previously could be achieved by
setting (in an unsupported way) by setting an undocumented parameter. It
needed _asm_allow_only_raw_disks=false I think.
Tanel
Post by n***@gmail.com
It is perfectly possible to create an ASM disk group on top of ASM. I
consider this daft of course, but still.
Post by Rakesh Ra
Hmmm I just read the below where in it states ASM is mandatory to store
voting files and ocr... I think this will be challenge for companies who
rely on NFS highly..
https://community.oracle.com/thread/4058349
Post by Rakesh Ra
All,
18c installation guides is not clear about whether we can install grid
infrastructure on dNFS ?? Is that possible?? All I see in the guide is
about ASM?? Is it mandatory to have ASM??
Thanks,
Rakesh RA
Tim Gorman
2018-11-19 20:29:26 UTC
Permalink
Be aware that the documentation referenced
<https://docs.oracle.com/database/122/UPGRD/deprecated-features-oracle-database-12c-r2.htm#UPGRD-GUID-2ABD2D83-F627-4BE5-87D8-B46B9CFCE5C7>
in this community thread does not substantiate what is instead
documented HERE
<https://docs.oracle.com/en/database/oracle/oracle-database/12.2/upgrd/desupported-features-oracle-database-12c-r2.html#GUID-2ABD2D83-F627-4BE5-87D8-B46B9CFCE5C7>.

*Deprecation* does not mean *mandatory*, particularly as the last
sentence of the substantiating document states, "/If your Oracle
Database files are stored on a shared file system, then you can continue
to use the same for database files, instead of moving them to Oracle ASM
storage./"

Having the vote disk in particular on a different clustered storage than
the database files essentially negates the concept of vote disk.  So I
believe that this deprecation notice is Oracle's way of both favoring
ASM as well as nudging people back to the base concept, where the OCR
and vote disk reside on the same storage as the database files.  I don't
see anywhere where Oracle has ever asserted that one type of clustered
storage is better or worse than others, but they've just stated their
preference for the type they themselves support, which is ASM.

Because ASM did not support the OCR and vote disk in its early versions,
many users established run books which employed other clustering
solutions like NFS or OCFS2 for those file structures, and ASM for
everything else, which was the only feasible and documented
configuration originally.  Chances are good that many DBAs still believe
that is the case.  So, I think Oracle is mostly nudging people to
realign with the basic concept, now that ASM does support OCR and vote
disk.  Just speculation, your mileage may vary...
Post by Rakesh Ra
Hmmm I just read the below where in it states ASM is mandatory to
store voting files and ocr... I think this will be challenge for
companies who rely on NFS highly..
https://community.oracle.com/thread/4058349
All,
18c installation guides is not clear about whether we can install
grid infrastructure on dNFS ?? Is that possible?? All I see in the
guide is about ASM??  Is it mandatory to have ASM??
Thanks,
Rakesh RA
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