RE: Does ocssd.bin started from 11gASM home support diskgroups mounted by 10g ASM instance

That was going to be my question, if I have multiple ASM instances, how does 
your Oracle instance know which one to talk to?  Also, what happens if I have 
my diskstring set to /dev/sd* in both instances?  Do they both try to mount the 
diskgroups?  Does Oracle have any sane sort of fencing to prevent that?  If so, 
is it just a race to acquire a lock?

It seems like bad mojo, even if technically it is possible.

Matt


-----Original Message-----
From: Martin Berger [mailto:martin.a.berger@xxxxxxxxx]
Sent: Mon 8/3/2009 4:34 PM
To: Matthew Zito
Cc: sanjeevorcle@xxxxxxxxx; John Hallas; oracle-l@xxxxxxxxxxxxx
Subject: Re: Does ocssd.bin started from 11gASM home support diskgroups  
mounted by 10g ASM instance
 

 I run some tests and it's really possible to run different ASMs on one 
machine. I also didn't found some evidence multiple ASMs are not _supported_ 
(even all documents I red only mentioned one ASM per node). - Only in RACs, 
only one ASM is _supported_.
 So I could not find any reason not to run multiple ASMs on one node (even it's 
very complicated).
 Just note, one Instance can only use all DiskGroups from one ASM; I didn't 
found any method to use DGs from different ASMs in one Instance. 
 I didn't analyse this fact to the end, but it seems to be based on the way an 
Instance gets the DG-metadata from the first ASM it asks, and therefore cannot 
merge this information with the one of any other ASMs. But this is just a 
guess(!)

br
 Martin


Am 03.08.2009 um 20:17 schrieb Matthew Zito:


                Uhhh, that is probably not a supported configuration.  One ASM 
instance per machine is the rule, AFAIK.
         
        Matt
         
        ________________________________

                From: oracle-l-bounce@xxxxxxxxxxxxx 
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of sanjeev m
        Sent: Monday, August 03, 2009 2:13 PM
        To: John Hallas
        Cc: oracle-l@xxxxxxxxxxxxx
        Subject: Re: Does ocssd.bin started from 11gASM home support diskgroups 
mounted by 10g ASM instance
         
        Since we can have only ONE ocssd.bin per host and there is a need to 
use 10gASM instance to keep things in sync with PRD env we brought up 10gASM 
instance. There are other 11g RDBMS on this host making use of 11g ASM instance.
         
        Regards,
        Sanjeev.
        On Mon, Aug 3, 2009 at 4:13 AM, John Hallas 
<John.Hallas@xxxxxxxxxxxxxxxxxx> wrote:

        I am a bit confused.

         

        11g ASM supports 10G RDBMS

        If I was running an 11g ASM instance I would start the occsd using  the 
11G binaries whether or not the 10G occsd binary worked

        Remember to get you compatibility settings correct

         

        col COMPATIBILITY form a10
        col DATABASE_COMPATIBILITY form a10
        col NAME form a20
        col VALUE form a10
        select group_number, name, compatibility, database_compatibility 
        from v$asm_diskgroup;

         

         

        alter diskgroup data set attribute 'compatible.rdbms'='10.2';
         
        alter diskgroup data set attribute 'compatible.asm'='11.1';
          

        (or whatever is appropriate)

        ________________________________

                From: oracle-l-bounce@xxxxxxxxxxxxx 
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of sanjeev m
        Sent: 03 August 2009 05:53
        To: oracle-l@xxxxxxxxxxxxx
        Subject: Does ocssd.bin started from 11gASM home support diskgroups 
mounted by 10g ASM instance

         

        Listers,

         

        On our non-rac environment we have upgraded 10g ASM home to 11g ASM 
home.Can we mount diskgroup belonging to 10g RDMS  from 10g ASM home even 
though the ocssd.bin process is running out of 11g ASM home. In our testing it 
looks like it is working. I would like to know from support and configuration 
point of view whether this i ok.

        In other words does ocssd.bin started from 11gASM home support 
diskgroups mounted by 10g ASM instance.

         

        Regards,

        Sanjeev.

        
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