Ric Wheeler wrote:
We still have the following challenges:
(1) read-ahead often means that we will retry every bad sector at
least twice from the file system level. The first time, the fs read
ahead request triggers a speculative read that includes the bad sector
(triggering the error handling mechanisms) right before the real
application triggers a read does the same thing. Not sure what the
answer is here since read-ahead is obviously a huge win in the normal case.
Probably the only sane thing to do is to remember the bad sectors and
avoid attempting reading them; that would mean marking "automatic"
versus "explicitly requested" requests to determine whether or not to
filter them against a list of discovered bad blocks.
-hpa
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