[snipped] > However, based on the data you've reported, sda1 and sdc1 are identical, > down to the superblock bytes. And sdb1 and sdd1 are also identical, > down to the superblock bytes. > > Are you sure there were no misdirected "dd" operations? > > Phil I did not start using ddrescue until after I was no longer able to boot the raid array. When I did the ddrescuing, I specifically used the /dev/disk/by-id symlinks, not the sdX names, precisely in order to avoid accidents. I was extremely alarmed by the inability to boot the raid10, and took extra care to make sure I was doing it properly. Here are my ddrescue log files: # Rescue Logfile. Created by GNU ddrescue version 1.16 # Command line: ddrescue --cluster-size=65536 --no-split --force /dev/disk/by-id/ata-ST32000542AS_5XW1P852 /dev/disk/by-id/ata-Hitachi_HDS724040ALE640_PK1310PAG62REJ /mnt/windows/5XW1P852_to_PK1310PAG62REJ.txt # current_pos current_status 0x1D1C0000000 + # pos size status 0x00000000 0x1D1C1116000 + # Rescue Logfile. Created by GNU ddrescue version 1.16 # Command line: ddrescue --cluster-size=65536 --no-split --force /dev/disk/by-id/ata-ST32000542AS_6XW1T1CG /dev/disk/by-id/ata-Hitachi_HDS724040ALE640_PK1310PAG62T2J /mnt/windows/6XW1T1CG_to_PK1310PAG62T2J.txt # current_pos current_status 0x1D1C0000000 + # pos size status 0x00000000 0x1D1C1116000 + # Rescue Logfile. Created by GNU ddrescue version 1.16 # Command line: ddrescue --cluster-size=65536 --no-split --force /dev/disk/by-id/ata-ST32000542AS_6XW1T14N /dev/disk/by-id/ata-Hitachi_HDS724040ALE640_PK1311PAG4W5TS /mnt/windows/6XW1T14N_to_PK1311PAG4W5TS.txt # current_pos current_status 0x1D1C0000000 + # pos size status 0x00000000 0x1D1C1116000 + # Rescue Logfile. Created by GNU ddrescue version 1.16 # Command line: ddrescue --cluster-size=65536 --no-split --force /dev/disk/by-id/ata-ST32000542AS_5XW1P41K /dev/disk/by-id/ata-Hitachi_HDS724040ALE640_PK1310PAG5ZY0J /mnt/windows/5XW1P41K_to_PK1310PAG5ZY0J.txt # current_pos current_status 0x1D1C0000000 + # pos size status 0x00000000 0x1D1C1116000 + (/mnt/windows is just where I mounted a spare 64Gb fat32 partition that is an extra, previously empty partition on the boot drive that also holds /boot and a linux swap partition). Dave -- 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
