@lispi314 good question.
- Maybe because #dmraid as Software-#RAID was tasked with checking itself and the underlying filesystems like #ext3 were taked to check integrity on their level as well?
After all physical device <=> physical volume partution <=> logical volume groups (w/ RAID) <=> filesystems were used in classic #Linux-RAID transparently to each other.
- This also allows for weird shit like =RAID10 with an odd number of drives](https://en.wikipedia.org/wiki/RAID#Non-standard_levels) (just having data duplicated on different drives and striped in one go.
But yeah, you are correct in that an integrity checkibg module was overdue...