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…