The two Intel MEMPEK1W016GA's are in raid10, but you aren't really
protected unless the drive reports a discrete read error. Only in that
case would the md driver know to use the mirror copy. While it
certainly should sooner report a read error than return zeros or
garbage, this is the situation we're in with SSDs. Is that what's
happening? *shrug* Needs more investigation. But it's at either the
bcache or mdadm level, near as I can tell.

Was there a crash or power failure while using this array by any chance?


Chris Murphy