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Annotation of researchv10dc/man/adm/man8/rarepl.8, revision 1.1.1.1

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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