Alan Stern wrote:
James:
This is an updated and unmangled version of the patch sent in by Martin
Peschke. Apparently some drives report Hardware Error sense for
problems which do improve after retrying, so the patch retries these
supposedly "unrecoverable" errors for such devices.
Recent SPC-3 and SBC-2 drafts treat the sense keys of
MEDIUM ERROR and HARDWARE ERROR in a similar way.
Both can return an "info" field which has the same
meaning (lba of first failure). The distinction is that
MEDIUM ERROR is a little more precise (at least for
magnetic rotating media) **. For flash ram the distinction
is moot.
I believe MEDIUM ERROR and HARDWARE ERROR should be
treated the same way in scsi_check_sense() (i.e.
both return NEEDS_RETRY). That way an extra black list
category is avoided.
** HARDWARE ERROR is returned in cases of self diagnostic
failure and lack of available blocks for reassignment.
It seems valid for a device to return a HARDWARE ERROR
sense key both for these cases and unrecoverable data
errors (and ignore MEDIUM ERROR).
Doug Gilbert
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
