How to Identify and Map the Real Physical Raw Device on Solaris Used as ASM Member or Candidate Disks on RAC or Standalone Configurations. (Doc ID 1911166.1)

Last updated on MAY 30, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.2 to 12.1.0.2 [Release 10.2 to 12.1]
Information in this document applies to any platform.

Goal

A) The present document shows an example about how to identify and map the real physical raw device on Solaris used as ASM member or candidate disk on RAC or Standalone configurations.

B) On Solaris configurations, ASM has several options to access the real raw/character devices presented as candidate/member disks.

Option 1:

1) Accessing the real raw device name located at “/dev/rdsk/<raw device name>”, example:

 
C) But on a cluster configuration, the “raw logical device name" (e.g. “/dev/rdsk/c1t0d0s6”) or “major/minor numbers" (“e.g. “[30,  6]”) associated to the “real physical raw/character device" (e.g. “../../devices/pci@0,0/pci108e,484d@1a/hub@1/storage@2/disk@0,0:g,raw”) could be the same or different in every node.

 
D) In other words, the same “real physical raw/character device" (e.g. “../../devices/pci@0,0/pci108e,484d@1a/hub@1/storage@2/disk@0,0:g,raw”) shared among all the nodes in the cluster, could be being accessed from every node with a different “raw logical device name” (e.g. “/dev/rdsk/c1t0d0s6” on "Node #1" &  “/dev/rdsk/c1t0d5s6” on "Node #2") and also the associated “major/minor numbers” could be different (e.g. “[30,  6]” on "Node #1" and “[30,  9]” on "Node #2") for the same physical raw device.

 
E) This behavior is expected on a cluster configuration, because the “raw logical device name” & “major/minor numbers” associated to a “real physical raw/character device” could be the same or different on every node in the same cluster.

 
F) Therefore, it is very important to understand how the “real physical raw/character devices” are mapped to the “raw logical device” and also how they are mapped to the “device alias” (if alias are defined) as explained in the following example.

Solution

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