In the past I have been a little critical of Oracle’s support notes and documentation regarding the use of Advanced Format 4k storage devices. I must now take that back, as my new friends in Oracle ASM Development and Product Management very kindly offered to let me write a new support note, which they have just published on My Oracle Support. It’s only supposed to be high level, but it does confirm that the _DISK_SECTOR_SIZE_OVERRIDE parameter can be safely set in database instances when using 512e storage and attempting to create 4k online redo logs.
The new support note is:
Using 4k Redo Logs on Flash and SSD-based Storage (Doc ID 1681266.1)