Selon thornber@xxxxxxxxxx: > > Any insight on where to put the log of the mirror target when mapping over > a > > MD-created raid1 ? > > MD effectively uses a log with a single region in it. So we only need > 3 sectors (2 for the header 1 for the bitset) for the log, is there > any space in the MD metadata where this could be placed ? > Nope : the sb is 4096 bytes long, and is full of holes. The biggest one is 128 bytes long, at the tail. We could lower the maximum number of device in a raid from 27 to 21 to free 3 sectors, but it won't be appreciated and would leave us with the most fundamental problem : logging in the MD superblock would corrupt the checksum ... :(
