Re: [suse-oracle] Flash and ASM

Hi Damien,

maybe this link helps a bit
 http://jarneil.wordpress.com/2008/01/02/book-review-oracle-automatic-storage-management/

On Fri, Jul 31, 2009 at 09:24:00AM -0400, Damien Pinault wrote:
> Hello all,
> 
> I would like to know where I could find some good links ( or
> documentation) about "How ASM works internally".
> I am especially interested about knowing how ASM maintains consistency
> across multiple disks ( file hearers, time stamp, journaling , etc .. ).
> 
> We have :
> * Oracle instances on ASM ( All active components reside on 1 VG :
> +DATA )
> * +DATA VG is based on multiple disks ( between 4 and 10 depending on
> the guest )
> * We flash the running instance with an hardware (IBM DS8100) or
> software ( LVM snapshots) solution without any consistency groups
> defined for the ASM disks.
>    The operation is really quick ( < 1 second ) and basically flashes
> the disks 1 by 1.
> * Database is in backup mode during the flash (alter database begin/end
> backup;)
> 
> ASM and DB seems to be in consistent mode every time when we start them
> both on the flashed system.
> I can understand the DB part but not really the ASM one. so is this just
> luck ?
> 
> Thanks in advance,
> 
> D>

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