I think today i noticed a problem described here. I have a running server with two disks (2x400) running in RAID-1, /dev/md0-5. I prepared an other set of disks (2x500) on another machine: /dev/md0, /dev/md1, /dev/md2. And now - when i put these 2x500 disks into my server whic halready has and raid-1 array (2x400) then the server WONT boot. Kernel panic - could not mount root. Right before some messages like:
/dev/md0 (driver?) /dev/md1 (driver?)
So, I think, i need to "destroy" the 2x500 array on another machine and then create again on my server directly. I found this site looking for an option if it's possible to tell mdadm to create the arrays staticaly or sth.
Peace.