epub3: spaonbv.epub
Do not write anything to the damaged device. Create a full image ( dd if=/dev/sdX1 of=damaged.img ) and attempt recovery on the image copy. This paper applies to XFS versions v4 and v5 on Linux kernels 2.6+ through 6.x.
xfs_repair -c 4096 /dev/sdX1 This overrides automatic block size detection. If you have an earlier full disk image, extract superblock from offset 0 and write to damaged device: xfs-repair sorry could not find valid secondary superblock
xfs_db -c "sb 0" -c "print" /dev/sdX1 # Fails if primary bad xfs_db -c "sb 1" -c "print" /dev/sdX1 # Try AG 1's superblock If AG 1 works, you can attempt to copy it back to AG 0: Do not write anything to the damaged device
1. Introduction The XFS file system, commonly used in enterprise Linux distributions (RHEL, CentOS, Rocky Linux, Debian/Ubuntu), relies on a robust superblock structure. Unlike ext4, XFS uses a primary superblock (located at block 0) and a series of secondary superblocks spread throughout the allocation groups (AGs). xfs_repair -c 4096 /dev/sdX1 This overrides automatic block
