ODA : 24 Extra Disk paths exists in ASM with group_number 0 and without suffix p1 or p2

Asset ID:	1-72-1644043.1
Update Date:	2014-04-10
Keywords:

Solution Type Problem Resolution Sure

Solution 1644043.1 : ODA : 24 Extra Disk paths exists in ASM with group_number 0 and without suffix p1 or p2

Applies to:

Oracle Database Appliance - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

In ODA system there are 24 extra ASM disk path exist as given below.

e.g. from v$asm_disk output there are 24 extra disk with group number 0 and without p1 or p2 as suffix in path.

Group# PATH
------ ----------------------------------
0 /dev/mapper/SSD_E1_S23_805650174
0 /dev/mapper/SSD_E1_S22_805649834
0 /dev/mapper/SSD_E0_S21_805650092
0 /dev/mapper/SSD_E0_S20_805650143
0 /dev/mapper/HDD_E1_S07_979788859
0 /dev/mapper/HDD_E1_S15_980711351
0 /dev/mapper/HDD_E1_S03_979852663
0 /dev/mapper/HDD_E1_S19_979894387
0 /dev/mapper/HDD_E1_S11_979832047
0 /dev/mapper/HDD_E1_S18_978146743
0 /dev/mapper/HDD_E1_S14_979870115
0 /dev/mapper/HDD_E1_S10_979868675
0 /dev/mapper/HDD_E1_S06_979774155
0 /dev/mapper/HDD_E1_S02_979863959
0 /dev/mapper/HDD_E0_S05_979851287
0 /dev/mapper/HDD_E0_S01_979828143
0 /dev/mapper/HDD_E0_S13_979811543
0 /dev/mapper/HDD_E0_S09_979865295
0 /dev/mapper/HDD_E0_S17_979870371
0 /dev/mapper/HDD_E0_S12_979780459
0 /dev/mapper/HDD_E0_S16_979861967
0 /dev/mapper/HDD_E0_S08_979868995
0 /dev/mapper/HDD_E0_S04_979784547
0 /dev/mapper/HDD_E0_S00_979817979

Changes

This issue is due to incorrect asm_diskstring parameter. Current asm_diskstring parameter is set to '/dev/mapper/*D_*' which must be set to '/dev/mapper/*D_*p*' for ODA system .

Cause

asm_diskstring parameter is changed to '/dev/mapper/*D_*' .

On ODA system there are three multipath created for one disk.

e.g.

/dev/mapper/HDD_E0_S00_979817979

/dev/mapper/HDD_E0_S00_979817979p1

/dev/mapper/HDD_E0_S00_979817979p2

Suffix p1 is for disks belong to DATA or REDO(in case SSD) and p2 for disks belong to RECO.

asm_diskstring to '/dev/mapper/*D_*p*' removes the disk path without suffix p1 or p2 to be visible from asm side.

Solution

To resolve this issue change asm_diskstring parameter back to '/dev/mapper/*D_*p*' .

Run following action plan on both the nodes.

On ASM instance :

connect as SYSASM

SQL> alter system set asm_diskstring= '/dev/mapper/*D_*p*' ;

***This action plan can be executed on running system***

Now check v$asm_disk output, all the disks with group_number '0' and without suffix p1 or p2 are removed now.

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