On Wed, 2004-03-03 at 11:24, Mike Gigante wrote: > On Wednesday 03 March 2004 10:43, Felipe Alfaro Solana wrote: > > But XFS easily breaks down due to media defects. Once ago I used XFS, > > but I lost all data on one of my volumes due to a bad block on my hard > > disk. XFS was unable to recover from the error, and the XFS recovery > > tools were unable to deal with the error. > > A single bad-block rendered the entire filesystem non-recoverable > for XFS? Sounds difficult to believe since there is redundancy such > as multiple copies of the superblock etc. You should believe it... It was a combination of a power failure and some bad disk sectors. Maybe it was just a kernel bug, after all, as this happened with 2.5 kernels: during kernel bootup, the kernel invoked XFS recovery but it failed due to media errors. > I can believe you lost *some* data, but "lost all my data"??? -- I > believe that you'd have to had had *considerably* more than > "a bad block" :-) It was exactly one disk block, at least that's what the low-level HDD diagnostic program for my IBM/Hitachi laptop drive told me. In fact, the HDD diagnostic was able to recover the media defects. That could have been one of those very improbable cases, but I lost the entire volume. Neither the kernel nor XFS tools were able to recover the XFS volume. However, I must say that I didn't try every single known way of performing the recovery, but recovery with ext2/3 is pretty straightforward. As I said, it could have been a kernel bug, or maybe I simply didn't understand the implications of recovery, but xfs_repair was totally unable to fix the problem. It instructed me to use "dd" to move the volume to a healthy disk and retry the operation, but it was not easy to do that as I explained before. _______________________________________________ Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
