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Update the fsck command in /etc/rc to use the new background

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fsck checking. Applying these changes (typically via mergemaster)
will cause your system to start running background checks on all
your soft update enabled filesystems (provided that you have
a kernel with the required functionality, e.g., one built since
the end of April). Please report any and all problems to
mckusick@mckusick.com (not mckusick@freebsd.org which I read
infrequently). See the comment above the fsck command in /etc/rc
for instructions on how to disable background checking should it
cause you too much trouble.

Several FAQs:

1) Can I reboot before the background checks are done?

Ans) Yes, when the system restarts the checks will pick up
     where they left off.

2) Can a crash during checking corrupt my filesystem?

Ans) No, recovered resources are returned to the system using soft
     updates which ensure that the freeing is done in a safe order.

3) How will I know if any background checks are being done?

Ans) Filesystems that are to be checked in background will be listed
     as `DEFER FOR BACKGROUND CHECKING' at the usual fsck check time
     during system startup.

4) What happens to the output of the background checks?

Ans) It is sent to syslog `daemon' facility log level `notice'.

5) When will this feature be available in the 4.X kernel?

Ans) Never. It is much too radical and extensive a change to be
     MFC'ed. Besides, it needs many months of experience and
     tuning before it is ready for widespread use.

6) What happens if a background fsck fails (i.e., fsck finds
   errors that would normally require a manual fsck)?

Ans) The filesystem will be marked as needing a manual fsck.
     At the next system reboot, the check will be done in
     foreground and the usual actions taken (usually a failure
     to go multi-user until fsck has been run by hand on the
     affected filesystem).
This commit is contained in:
mckusick 2001-05-11 07:40:39 +00:00
parent ba4a7b751f
commit 78ec8b22ef
1 changed files with 7 additions and 1 deletions
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8
etc/rc
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@ -184,7 +184,9 @@ swapon -a
case ${bootmode} in
autoboot)
echo 'Automatic boot in progress...'
fsck -p
# To restore old fsck behavior use:
# fsck -p
fsck -F -p
case $? in
0)
;;
@ -810,6 +812,10 @@ case ${kern_securelevel_enable} in
;;
esac
# Start background fsck checks
echo 'Starting background filesystem checks'
nice -4 fsck -B -p 2>&1 | logger -p daemon.notice &
echo ''
date