While this is an older Alert in My Oracle Support, the article "After SAN Firmware Upgrade, ASM Diskgroups ( Using ASMLIB) Cannot Be Mounted Due To ORA-15085: ASM disk "" has inconsistent sector size" under note ID 1500460.1 may have some relevance for you and I wonder if this may have something to do with an issue we had a while ago with ASM. Apparently, the logical block sizes and physical block sizes can get out of sync after a SAN upgrade and more importantly the physical block size can be set to a size that ASM does not currently recognize as valid. Yikes!
Luckily, this article does a VERY through job of explaining the problem, the cause, and the ways that it can be resolved.
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