Advertisement
REPAIR COMMAND
22.4 -- Retrieval Information Block Check
write commands can
be
used
to
reconstruct
a
valid
RIB.
Sometimes,
it
will
re~uire
less effort to recreate a file's
RIB (if the allocation map has been recently printed via
the
D1R command) than to recreate the file itself.
After
a
RIB has been reconstructed, REPAIR should be run
again to ensure that there is no dual allocation with another
fi 1
e.
After
all
Or
the RIBs have been checked,
di~played
to
monitor
REPAIR's
progress.
information takes on the following Tormat:
a summary is
The
summary
xx
GOOD
FILES
yy
FILES WITH
BAD
RIBS
where
"
XX "
and
nl:p::I1f
are
both
hexadecimal
numbers.
The
display of this message indicates the end of Phase
3.
22.5
CAT Regeneration Phase
Phase
4 of
the REPAIR
command
reconstructs
a
cluster
allocation
table in memory from the RIBs of those files that
have no errors
("xx"
in the Phase
3.
summary message>.
Phase
4
consists of three passes.
Pass
1
o~
Phase
4
reads all valid RIBs.
All clusters
that are allocated are retained in memory in a
table
called
Table
1.
A
second
table,
Table
2,
also in memory,
will
contain all clusters which have been allocated to
more
than
one Tile.
If no dual allocation has occurred, Table
2
should
be empty at the end of Pass
1.
IT it is,
the rest
oT
Phase
4
is skipped.
If
Pass
1
has determined that dual allocation occurred,
then Pass
2
of Phase
4
will read
all
RIBs
a
second
time.
This time, the files which have clusters allocated in Table 2
are Tlagged so the file's names and conflicts can be shown in
Pass
3.
A summary message is displayed at the end of Pass 2 that
gives totals of the number of files
with
and
without
dual
allocation.
The format of the summary message is
xx GOOD FILES
yy FILES WITH DUPLICATIONS
zzzz
ALLOCATION DUPLICATIONS
whe-re
"XX":
"yy".1
and
"ZIZZ"
are all hexadecimal numbers.
The totals "xx" and "yy" refer
to
numbers
of
files.
The
number "
ZIZZ ",
however, refers to the number of clusters that
are
common
to
th e
I I
\j \j
tI
of
i
I es.
Th e
ac tual
messag e
is
displayed on a single line.
Pass
3 of Phase 4 will perform an analysis of all riles
Page
22-15
Advertisement
