On Wed, 15 Apr 2009, Uwe Dippel wrote:
Now I wonder where that error came from. It was just a single checksum error. It couldn't go away with an earlier scrub, and seemingly left no traces of badness on the drive. Something serious? At least it looks a tad contradictory: "Applications are unaffected.", it is unrecoverable, and once cleared, there is no error left.
Since it was not reported that user data was impacted, it seems likely that there was a read failure (or bad checksum) for ZFS metadata which is redundantly stored. It could just as well been file data but you are lucky this time.
If you are worried about your individual files, then it might be wise to set copies=2 so that file data is duplicated, but this will consume more space and reduce write performance. It is better to add a mirror disk if you can since the whole disk could fail.
Ubuntu Linux is unlikely to notice data problems unless the drive reports hard errors. ZFS is much better at checking for errors.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
