Once, long ago--actually, on Mon, Oct 29, 2012 at 12:59:44PM CDT--Robert Nichols (rnicholsNOSPAM@xxxxxxxxxxx) said: > A sector that is unreadable even after retries CANNOT be remapped until it > is written, and any attempts to read it MUST return an I/O error until > that remapping has occurred. On a full failure, yes. The firmware should, however, detect sectors that are failing and remap them on an ongoing basis. You wouldn't get notifications about those, and they should be far more frequent than undetected full read failures. > If the drive were to go ahead and immediately remap that unreadable > sector, what data would you suggest that it return when the sector > is read? All-zeros with no indication of error is NOT acceptable. Of course not, and just what the firmware should do with a full read failure of a previously unsuspected bad sector, I'm sure, has been the subject of design meetings at the various disk manufacturers. My suspicion is that such a full failure would have to be exempt from automatic remapping, resulting in reported failures before all of the available spare sectors are allocated. I would, however, expect such a condition to be either a rare occurance--due to physical damage/shock, unexpected power failure, etc.--making it a class of general "one-off" events, or part of an increasing cascade of detected predictive failures resulting in automatic remapping in the case of a failing disk. And I suspect we've gotten much more deeply into the topic than I expect most of the list cares about. Cheers, -- Dave Ihnat dihnat@xxxxxxxxxx -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
