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.