A/UX® System Administrator's Reference Sections 1M, 7, and 8

esch(8) esch(8)
Autorecovery file systems contain copies of files that are necessary
for a minimal multiuser A/UX system. If new versions of
commands, programs, or files are installed on the system, the autorecovery
file systems should be Updated using eu(1M) or
eseher(IM).
eseh will check each file system for bad blocks. This is done by
verifying that each block can be read. If possible, any blocks that
cannot be read will be spared by the hardware or replaced with alternate
blocks (see al tblk(4» by the software. If neither of
these is successful, the block number is added to a list of blocks
that is passed to fsck. fsek will add these blocks to a file associated
with inode one; this has the effect of removing the blocks
from the file system. Checking for bad blocks is a timeconsuming
process. This phase of autorecovery may be omitted
using the -b flag option. It is advisable to occasionally run eseh
without the -b flag option to be sure any bad blocks have been
dealt with in the appropriate manner.
eseh will then run fsek on each file system. This invocation of
fsek uses the -y flag option. All questionable files will be removed
from the file system. If fsek should fail or if the superblock
is unreadable, a mkfs (see mkfs(IM» will be performed
on the file system.
After the file systems have been checked for consistency, e s eh
will enter the file check merge phase. The configuration master
list (see eml(4» is a list of files required for a multiuser NUX
system. This file gives rules about the attributes of each required
file. The file check merge phase of e s eh will check each file in
the eml for conformity to the specified file attributes (size, version,
check sum, permissions, and so forth). If a file does not conform
to these rules, eseh will attempt to replace it with a copy
from an autorecovery file system. If the file in question is found
on an autorecovery file system, it must conform to the eml rules
or it will not be placed on the root or usr file system.
FILES
/ete/esehatology/init2files
SEE ALSO
eseher(IM), eu(IM), eupdate(1M), fsck(1M), mkfs(IM),
altblk(4), eml(4), dpme(4), fs(4), autoreeovery(8),
StartupShell(8).
"System Startup and Shutdown" inAIUX Local System Adminis-
2
February, 1990
RevisionC