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手册上有这么一段：
File System Response to Problems
When the file system encounters problems, it responds in one of three ways:
• marks an inode bad
• disables transactions
• disables the file system
Marking an Inode Bad
Inodes can be marked bad if an inode update or a directory-block update fails.
In these types of failures, the file system doesn’t know what information is on
the disk, and considers all the information that it finds to be invalid. After an
inode is marked bad, the kernel still permits access to the file name, but any
attempt to access the data in the file or change the inode fails.
Disabling Transactions
If the file system detects an error while writing the intent log, it disables
transactions. After transactions are disabled, the files in the file system can still
be read or written, but no block or inode frees or allocations, structural
changes, directory entry changes, or other changes to metadata are allowed.
Disabling the File System
If an error occurs that compromises the integrity of the file system, VxFS
disables itself. If the intent log fails or an inode-list error occurs, the superblock
is ordinarily updated (setting the VX_FULLFSCK flag) so that the next
fsck does a full structural check. If this super-block update fails, any further
changes to the file system can cause inconsistencies that are undetectable by
the intent log replay. To avoid this situation, the file system disables itself.
Recovering a Disabled File System
When the file system is disabled, no data can be written to the disk. Although
some minor file system operation still work, most simply return EIO. The only
thing that can be done when the file system is disabled is to do a umount and
run a full fsck.
Although a log replay may produce a clean file system, do a full structural
check to be safe. To do a full structural check, enter:
# fsck -F vxfs -o full -y /dev/rdsk/c1t0d0s1
The file system usually becomes disabled because of disk errors. Disk failures
that disabled a file system should be fixed as quickly as possible (see
fsck_vxfs(1M)). |
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发表于 2006-12-18 23:15
