Disks not detected during ASM setup 11gR2

From: sundar mahadevan <sundarmahadevan82_at_gmail.com>
Date: Sat, 1 Jan 2011 17:57:04 -0500
Message-ID: <AANLkTim9usqafJ6+nVO6PY0j+OtJQ0_tuJOXfGNZTyHL_at_mail.gmail.com>

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_at_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_at_sunny2 /root$

*After iscsi initiator start:*

root_at_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_at_sunny2 /root$

root_at_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_at_sunny2 /root$

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Received on Sat Jan 01 2011 - 16:57:04 CST