Boot disks order and informations

Latest response

Hi,

I have an issue difficult to deal with on a RHEL 7.5 entreprise Linux.
Here is the Oracleasm disks on my server, and after a reboot, it seems that boot disk order has changed causing some issue with the ASM disk.

First i want to know what is exactly thoses couples of numbers below:
8, 81
8, 97
8, 113

[root@myserver disks]# ls -l
total 0
brw-rw---- 1 oracle oinstall 8, 81 Feb 12 12:30 DATA
brw-rw---- 1 oracle oinstall 8, 97 Feb 12 12:30 FRA
brw-rw---- 1 oracle oinstall 8, 113 Feb 12 12:30 OCR

and if i can change the boot disk order manualy

Thanks all

Responses

Hi,

Have your Oracle ASM disks configured properly? If not, please refer this knowledge base article https://access.redhat.com/solutions/272153

Regarding your other questions, those are block device Major & Minor numbers. You could simply run the "lsblk -d" command to print out main block devices details (partition details are excluded) along with Major & Minor number as shown below:

[root@status rsyslog.d]# lsblk -d
NAME MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
fd0    2:0    1    4K  0 disk 
sda    8:0    0   20G  0 disk 
sdb    8:16   0   10G  0 disk 
sdc    8:32   0    1G  0 disk 
sr0   11:0    1  3.8G  0 rom  /run/media/root/RHEL-7.4 Server.x86_64

So, to cut out media drive, need to include '-e' with major device number as shown here:

[root@status rsyslog.d]# lsblk -d -e 2,11
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda    8:0    0  20G  0 disk 
sdb    8:16   0  10G  0 disk 
sdc    8:32   0   1G  0 disk 

I hope this helps.