term% cat index.txt 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 (drives such as
the RA60 and RA81 on controllers like the UDA50). Normally the re‐
placement 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 -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 con‐
tents 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 (usually 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 partic‐
ular 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)