Re: How does a LUN map to a disk or a partition

From: Karl Arao <>
Date: Fri, 17 Jul 2009 10:23:01 +0800
Message-ID: <>

> I would like to know how does a LUN map to a partition from a storage and
> host point of view ?
> how do i say /dev/sdb1 maps to LUN0 ?

To clearly show the relationship from the Oracle layer (ASM/raw), Linux, SAN. Get the following info



- Major Number
- Minor Number
- Device Name
- EMC Power Device Name (let's say you're on EMC)

- Logical Device ID
- Logical Device Name

Put these info in an Excel file. Any changes that you do, you must coordinate it with your storage admin or vice versa because you don't want to accidentally format a device allocated for an ASM disk group... :)

You could look at a sample table on Part 1: 2b of this doc

Received on Thu Jul 16 2009 - 21:23:01 CDT

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