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Re: HAMMER and bad disk sectors

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Jan 2011 20:29:11 -0800 (PST)

:What does HAMMER do about bad sectors? Does it mark them as corrupt, and
:allow system to function normally?

    You will get read errors.  EIO for any related files/directories.
    It may or may not be able to reallocate them but HAMMER does not keep
    a bad-block table.  media errors generally mean the media must be
    replaced.  If the media error occurs in a bad place, like a bitmap or
    undo record, the filesystem will be knocked down to read-only mode.

    If the media errors prevent you from being able to backup the filesystem
    you can use the hammer recover directive to exhaustively locate and copy
    the directory tree to another hammer filesystem on different media.

					Matthew Dillon 

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