One of the ASM concepts isn't clear for me. Can anybody explain?
- From: "Jurijs Velikanovs" <j.velikanovs@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 30 Jun 2006 02:04:15 +0100
Hello community,
Just wonder if anybody from you can comment:
A.FS
In case of a regular File System (FS) Oracle process passes file name
and relative block number to FS/OS code is responsible for retrieving
the particular block to the process, right?
B. RAW
In case of raw device Oracle process opens device and requests device
driver to retrieve the particular block by providing offset of it.
C. ASM Question !!!!
Question is that is going on in case of ASM?
Oracle instance doesn't pass an IO request to ASM. It is clear. ASM is
there just for providing metadata for all Oracle instance about files'
blocks location/offset.
Does Oracle Instance asks ASM about offset of the particular block the
Instance is interested in each time it needs issue IO request or each
Oracle instance has additional data structures (cache) to stores
metadata about offsets and physical layout of the particular disc
group and files located on it?
PS Never worked with ASM so far. Pointers to the documentation there
this question would be covered really appreciated.
Thank you in advance,
--
Yury
+44 7738 013090 (GMT)
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