[suse-oracle] Flash and ASM

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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