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Full Discussion: Understanding fsck pass in /etc/vfstab
Operating Systems Solaris Understanding fsck pass in /etc/vfstab Post 302968535 by MadeInGermany on Thursday 10th of March 2016 11:52:36 AM
Old 03-10-2016
Yes / is an exception, it needs to be there in order to have any files.
If a file system is read-only, you can run fsck on it. But as soon fsck modifies something, the system is likely to crash (because cashed things do not match real things), so it should be umounted/remounted ASAP.
If a file system is read-write, you can technically run fsck on it. But if either a user or fsck does modifications during the fsck run, the whole stuff goes out of sync, and the system is likely to crash with a permanently inconsistent file system. Once inconsistent, any further write will grow the inconsistencies. A long grown inconsistency can lead to a point that finally an fsck during a system boot will move a major part of the files to lost+found, with lost attributes, file names, directory names, directory hierarchy.
 

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LEARN ABOUT V7

fsck_cachefs

fsck_cachefs(1M)					  System Administration Commands					  fsck_cachefs(1M)

NAME

       fsck_cachefs - check integrity of data cached with CacheFS

SYNOPSIS

       fsck -F cachefs [-m] [-o noclean] cache_directory

DESCRIPTION

       The  CacheFS  version  of the fsck command checks the integrity of a cache directory.This utility corrects any CacheFS problems it finds by
       default. There is no interactive mode. The most likely invocation of fsck for CacheFS file systems is at boot time from	an  entry  in  the
       /etc/vfstab file. See  vfstab(4).

OPTIONS

       The following options are supported:

       -m	       Check, but do not repair.

       -o noclean      Force a check on the cache even if there is no reason to suspect there is a problem.

EXAMPLES

       Example 1: Using fsck_cachefs to Force a Check on the Cache Directory

       The following example forces a check on the cache directory /cache3:

       example% fsck -F cachefs -o noclean /cache3

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cfsadmin(1M), fsck(1M), mount_cachefs(1M), vfstab(4), attributes(5)

SunOS 5.10							    9 Oct 2002							  fsck_cachefs(1M)
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