Skip to Main Content

Oracle Database Discussions

Announcement

For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle.com. Technical questions should be asked in the appropriate category. Thank you!

ORA-15038: disk 'ORCL:DISK1' mismatch on 'Physical Sector Size' with target disk group [4096] [512]

Tiny_May 11 2023

Dears,

I have 2 nodes 12c cluster running on Oracle Linux 7.8, they are use ASM as data store, where there's 2 Disk groups (DATA and FRA) and they was working fine for years.

The second node can access and mount the disk groups without problems:

SELECT MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,TOTAL_MB,FREE_MB,NAME,PATH,LABEL FROM V$ASM_DISK;

CACHED	MEMBER	ONLINE	NORMAL	1048572	894420	FRA_0000	/dev/oracleasm/disks/DISK2	DISK2
CACHED	MEMBER	ONLINE	NORMAL	1048576	298304	DATA_0000	/dev/oracleasm/disks/DISK1	DISK1

Where the first one fails to start the disk group and gave me:

ORA-15038: disk 'ORCL:DISK1' mismatch on 'Physical Sector Size' with target disk group [4096] [512]

fdisk -l shows disks correctly on both nodes, also oracleasm listdisks !

# fdisk -l /dev/sdb

Disk /dev/sdb: 2395.0 GB, 2394997915648 bytes, 4677730304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 1048576 bytes
Disk label type: dos
Disk identifier: 0x3a9e4612

Device Boot Start End Blocks Id System
/dev/sdb1 2048 2147485695 1073741824 83 Linux
/dev/sdb2 2147485696 4294967294 1073740799+ 83 Linux
# oracleasm listdisks
DISK1
DISK2
# oracleasm querydisk DISK1
Disk "DISK1" is a valid ASM disk

The strange is on error message it says “target disk group [4096] [512]” ie. 4096 Logical sector size and 512 physical sector size, Is the correct ?

On my database the sectors size are as follow:

SELECT *FROM V$ASM_DISKGROUP;

1	DATA	512	512	4096	4194304	CONNECTED	EXTERN
2	FRA	512	512	4096	4194304	CONNECTED	EXTERN

Where should I start my search and do you have any ideas regarding this issue ?

Thanks and best regards

This post has been answered by Tiny_ on May 14 2023
Jump to Answer
Comments
Post Details
Added on May 11 2023
2 comments
1,331 views