RE: Does ocssd.bin started from 11gASM home support diskgroups mounted by 10g ASM instance
Date: Mon, 3 Aug 2009 18:02:30 -0400
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.
From: Martin Berger [mailto:martin.a.berger_at_gmail.com] Sent: Mon 8/3/2009 4:34 PM
To: Matthew Zito
Cc: sanjeevorcle_at_gmail.com; John Hallas; oracle-l_at_freelists.org 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(!)
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.
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of sanjeev m Sent: Monday, August 03, 2009 2:13 PM To: John Hallas Cc: oracle-l_at_freelists.org 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_at_morrisonsplc.co.uk> 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)Received on Mon Aug 03 2009 - 17:02:30 CDT
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of sanjeev m Sent: 03 August 2009 05:53 To: oracle-l_at_freelists.org 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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