On Mon, 2013-06-24 at 08:18 -0400, Mark Lord wrote: > And the SCSI stack in Linux has rather atrocious error handling. > It lumps multiple requests together, and can fail the entire lot even > if only a single sector is bad.
That's rather misleading. SCSI doesn't lump anything together; it handles the requests it was passed. For reads and writes through the page cache, block will aggregate in the elevators, but you avoid that by not using the page cache (O_DIRECT or SG_IO). For devices which report failing sectors correctly data up to the failed sector is returned and the request is shortened and retried from the failed sector on. If we get a second failure at the beginning (where the previous bad sector was), then we give up. James -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
