RAREPL(8) 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 (drives such as the RA60 and RA81 on controllers like the UDA50). 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 logi- cal 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 -h option prints some header data from the first block of the RCT. UNIX makes no use of this info. -c prints geometry info for the drive. Either option suppresses the RCT listing. Rarepl causes logical block lbn on device dev to be marked as bad and replaced. The nearest available replacement block is used. The contents of lbn are copied into the replacement block if possible; if lbn is unreadable, the replacement block is initialized with zeroes. Both programs work only on the raw devices. Rarepl should be used only on a device which covers the entire drive (usu- ally partition 7). SEE ALSO ra(4) BUGS On the UDA50, 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 RAREPL(8) RAREPL(8) RCT is corrupted, the disk may still be used, but must be reformatted before additional bad blocks are remapped.