Hi Bob, Bob Friesenhahn wrote:
>> AFAIK this is not done during the normal operation (unless a disk asked >> for a sector cannot get this sector). > > ZFS checksum validates all returned data. Are you saying that this fact > is incorrect? > No sorry, too long in front of a computer today I guess: I was referring to hardware RAID controllers, AFAIK these usually do not check the validity of data unless a disc returns an error. My knowledge regarding ZFS is exactly that, that data is checked in the CPU against the stored checksum. >> That's exactly what volume checking for standard HW controllers does as >> well. Read all data and compare it with parity. > > What if the data was corrupted prior to parity generation? > Well, that is bad luck, same is true if your ZFS box has faulty memory and the computed checksum is right for the data on disk, but wrong in the sense of the file under consideration. Sorry for the confusion Cheers Carsten _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
