Hi folks, I have a case where I lost the last ~2000 sectors of my hard drives*. As that's where the 0.90 superblock is stored, those disks are no longer automatically recognized by md. Apart from that part, my disks and other hardware is fine. This is a RAID6 with 6 disks, 3 of which were chomped, so my RAID is at this point failed. However, I'm the kind of embedded engineer who likes to program with live wires and magnetic tape, so I figure I can try and reconstruct that data, possibly by copying and altering the superblocks from the other disks. My google-fu may be weak, but I haven't found any info on the wiki or on the ML about on-disk structures and recovering from this kind of nightmare scenario. I haven't yet opened up the source (kernel or mdadm). So my questions are: Has anybody else faced and recovered from such a situation? Apart from the superblock, is there any metadata I have to worry about in the last 1MB of space on the disk? This may not be the best place to ask, but is there any XFS data around there which I have to worry about as well? I can give much more details of course. And, oh yeah, merry Festivus ;) John *I'm going to name names: the consumer motherboard Gigabyte GA-P35-DS4 has a feature/bug where it backs up the BIOS at the end of the first hard disk, hiding that part using Host Protected Area. By the time I understood what was going on, I had already had 3 disks chomped from swapping them on the controller. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
