ASM 11.2 error ORA-15038

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The error appears upon starting the ASM instance mounting a diskgroup manually

ORA-15032: not all alterations performed
ORA-15040: diskgroup is incomplete
. . .
ORA-15038: disk **** mismatch on 'Time Stamp' with target disk group [1752361090] [1751191692]


THis happend to us right after an upgrade of the ASM an was kind of thrilling. I thought we damaged some of the disk headers during the upgrade.

But the problem is far smaller. You just need to fix the value of asm_diskstring. With the right string, it works like charm.

11.1 would show far less shocking error message in this case…