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Re: ASM Record Deletions

From: Sanjay Mishra <>
Date: Thu, 15 Jun 2006 14:12:33 -0700 (PDT)
Message-ID: <>

Alex Here is what I am referring. As per the notes and even on the Link Implementing ASM Storage In Oracle Databases Every database instance that uses ASM for file storage will also need two new processes. The Rebalancer background process (RBAL) handles global opens of all ASM disks in the ASM Disk Groups, while the ASM Bridge process (ASMB) connects as a foreground process into the ASM instance when the regular database instance starts. ASMB facilitates communication between the ASM instance and the regular database, including handling physical file changes like data file creation and deletion.   ASMB exchanges messages between both servers for statistics update and instance health validation. These two processes are automatically started by the database instance when a new Oracle file type - for example, a tablespace's datafile -- is created on an ASM disk group. When an ASM instance mounts a disk group, it registers the disk group and connect string with Group Services. The database instance knows the name of the disk group, and can therefore use it to locate connect information for the correct ASM instance.    

  Now as per the Documentation    


- OCSSD is part of RAC and Single Instance with ASM
- Provides access to node membership
- Provides group services
- Provides basic cluster locking
- Integrates with existing vendor clusteware, when present
- Can also runs without integration to vendor clustware
- Runs as Oracle.


  You are right that I can check this from v$asm_client and even can check the diskgroup information from v$asm_diskgroup on the database instance that will show as what diskgroup are available on the associated ASM instance. What I am trying to find is that where and how this Group services works. Is there any file that will be maintained by CSS or something linked to it.    

  Sorry it is stupid question but I am trying to understand more deep concept when my company is planning to go all installation using ASM.    


Alex Gorbachev <> wrote:   


I have an impression that you are trying to do something wrong because your questions are somewhat strange. At least, I don't understand where are you going. Perhaps, you could explain a bit more what you are trying to achieve

Regarading you questions:
ASM sees database instances connected as clients. You can see ASM clients in the V$ASM_CLIENT view of the ASM instance.


2006/6/15, Sanjay Mishra :
> thanks for the information. I will send the slide itself to you as I don't
> have the link. Is there any way I can get the information outside the
> database like from CSS temp file that it is maintaining this information as
> long as both ASM and associated database is running.

Best regards,
Alex Gorbachev

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Received on Thu Jun 15 2006 - 16:12:33 CDT

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