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Annotation of researchv10dc/man/man8/rarepl.8, revision 1.1

1.1     ! root        1: .TH RAREPL 8
        !             2: .CT 1 sa_nonmortals
        !             3: .SH NAME
        !             4: rarepl, rarct \- replace bad blocks on MSCP disks
        !             5: .SH SYNOPSIS
        !             6: .B /etc/rarct
        !             7: [
        !             8: .B -c
        !             9: ]
        !            10: [
        !            11: .B -h
        !            12: ]
        !            13: .I special ...
        !            14: .PP
        !            15: .B /etc/rarepl
        !            16: .I special
        !            17: .I lbn ...
        !            18: .SH DESCRIPTION
        !            19: .I Rarct
        !            20: prints status information
        !            21: about MSCP disk drives
        !            22: like the RA60 and RA81.
        !            23: Normally the replacement table (RCT)
        !            24: is listed,
        !            25: as lines of the form
        !            26: .IP
        !            27: .IB rbn : \0flags : \0lbn
        !            28: .PP
        !            29: where
        !            30: .I rbn
        !            31: is the replacement block number,
        !            32: .I lbn
        !            33: is the logical block number
        !            34: replaced by
        !            35: .IR rbn ,
        !            36: and
        !            37: .I flags
        !            38: are constructed from the following bits:
        !            39: .TP
        !            40: .PD 0
        !            41: .B 01
        !            42: alternate (not primary) replacement block
        !            43: .TP
        !            44: .B 02
        !            45: normal, allocated replacement block
        !            46: .TP
        !            47: .B 04
        !            48: this replacement block is bad
        !            49: .TP
        !            50: .B 010
        !            51: this replacement block does not exist
        !            52: .PD
        !            53: .PP
        !            54: Entries whose
        !            55: .I flags
        !            56: are zero,
        !            57: indicating a good,
        !            58: unused replacement block,
        !            59: are not listed.
        !            60: .PP
        !            61: The options suppress the RCT listing and perform other functions:
        !            62: .TP
        !            63: .B -h
        !            64: Print some header data
        !            65: from the first block of the RCT.
        !            66: The system does not use this information.
        !            67: .TP
        !            68: .B -c
        !            69: Print geometry information for the drive.
        !            70: .PP
        !            71: .I Rarepl
        !            72: causes logical block
        !            73: .I lbn
        !            74: on device
        !            75: .I dev
        !            76: to be marked as bad
        !            77: and replaced.
        !            78: The nearest available replacement block
        !            79: is used.
        !            80: The contents of
        !            81: .I lbn
        !            82: are copied into the replacement block if possible;
        !            83: if
        !            84: .I lbn
        !            85: is unreadable,
        !            86: the replacement block
        !            87: is initialized with zeros.
        !            88: .PP
        !            89: Both programs
        !            90: work only
        !            91: on the raw devices.
        !            92: .I Rarepl
        !            93: should be used only
        !            94: on a device
        !            95: which covers the entire drive
        !            96: (usually partition 7).
        !            97: .SH SEE ALSO
        !            98: .IR ra (4),
        !            99: .IR smash (8)
        !           100: .SH BUGS
        !           101: There are various controller- and drive-dependent anomalies.
        !           102: Some controllers,
        !           103: like the RQDX3,
        !           104: report an RCT
        !           105: but don't allow forwarding.
        !           106: On many controllers,
        !           107: the RCT exists
        !           108: only so programs in the host can look at it;
        !           109: the controller ignores its contents.
        !           110: There is no way to read the controller's `real' forwarding data,
        !           111: only a way to set it for a particular block.
        !           112: Hence if the RCT is corrupted,
        !           113: the disk may still be used,
        !           114: but must be reformatted
        !           115: before additional bad blocks are remapped.

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