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RAREPL(8) System Manager's Manual RAREPL(8) NAME rarepl, rarct - replace bad blocks on MSCP disks SYNOPSIS /etc/rarct [ -c ] [ -h ] special ... /etc/rarepl special lbn ... DESCRIPTION Rarct prints status information about MSCP disk drives like the RA60 and RA81. Normally the replacement table (RCT) is listed, as lines of the form rbn: flags: lbn where rbn is the replacement block number, lbn is the logical block number replaced by rbn, and flags are constructed from the following bits: 01 alternate (not primary) replacement block 02 normal, allocated replacement block 04 this replacement block is bad 010 this replacement block does not exist Entries whose flags are zero, indicating a good, unused replacement block, are not listed. The options suppress the RCT listing and perform other functions: -h Print some header data from the first block of the RCT. The system does not use this information. -c Print geometry information for the drive. Rarepl causes logical block lbn on device dev to be marked as bad and replaced. The nearest available replacement block is used. The con- tents of lbn are copied into the replacement block if possible; if lbn is unreadable, the replacement block is initialized with zeros. Both programs work only on the raw devices. Rarepl should be used only on a device which covers the entire drive (usually partition 7). SEE ALSO ra(4), smash(8) BUGS There are various controller- and drive-dependent anomalies. Some con- trollers, like the RQDX3, report an RCT but don't allow forwarding. On many controllers, the RCT exists only so programs in the host can look at it; the controller ignores its contents. There is no way to read the controller's `real' forwarding data, only a way to set it for a particular block. Hence if the RCT is corrupted, the disk may still be used, but must be reformatted before additional bad blocks are remapped. RAREPL(8)