RE: Disks not detected during ASM setup 11gR2

What I do not see is any mention of a SHARED disk that is visible to
both of your servers: without this you cannot run RAC.

 

From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of sundar mahadevan
Sent: Saturday, January 01, 2011 5:57 PM
To: Oracle-L@xxxxxxxxxxxxx
Subject: Disks not detected during ASM setup 11gR2

 

Hi All,
Wish you all a very happy new year. I am trying to setup a 11gR2 non RAC
with ASM on OEL 5.4 I am having trouble setting up ASM. I have an ACER
laptop with 4GB RAM and 320 GB hard drive each. Would appreciate if you
could help me with the following:

1) ASM is defined as a feature. So is there a file system underneath or
is it working on raw devices? I did not find a straight answer for this.
2) To setup 11gR2 RAC with ASM and 11gR2 NON RAC with ASM, am I correct
in understanding that 2 separate binaries are required on 2
laptops/servers meaning there will be 4 oracle homes: 1 for ASM, 1 for
RAC binary, 1 for Non RAC binary, 1 for clusterware
3) I installed a 11gR2 non rac binary successfully (just the software no
database). Now I am trying to install ASM with grid infrastructure
runinstaller. My disks are not detected at this stage. The default OS
setup came with 4 logical volumes and I created a logical volume
LogVol04 of size 105GB to be used for ASM. I used iscsi initiator and
detected it as /dev/sdb. What am I doing wrong here. Should n't
/dev/sdb1 be detected by asm for disks? Please advice. Many Thanks for
your help.

Before iscsi initiator start:

root@sunny2 /root$ fdisk -l

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       38913   312464250   8e  Linux LVM
root@sunny2 /root$ 

After iscsi initiator start:

root@sunny2 /root$ fdisk -l

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       38913   312464250   8e  Linux LVM

Disk /dev/sdb: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       12748   102398278+  83  Linux
root@sunny2 /root$ 


root@sunny2 /root$ ll /dev/VolGroup01/*
lrwxrwxrwx 1 root root 31 Jan  1 17:40 /dev/VolGroup01/LogVol00 ->
/dev/mapper/VolGroup01-LogVol00
lrwxrwxrwx 1 root root 31 Jan  1 17:40 /dev/VolGroup01/LogVol01 ->
/dev/mapper/VolGroup01-LogVol01
lrwxrwxrwx 1 root root 31 Jan  1 17:40 /dev/VolGroup01/LogVol02 ->
/dev/mapper/VolGroup01-LogVol02
lrwxrwxrwx 1 root root 31 Jan  1 17:40 /dev/VolGroup01/LogVol03 ->
/dev/mapper/VolGroup01-LogVol03
lrwxrwxrwx 1 root root 31 Jan  1 17:40 /dev/VolGroup01/LogVol04 ->
/dev/mapper/VolGroup01-LogVol04
root@sunny2 /root$ 

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