File system specifier -- For disk-based file systems, either a device file name (/dev/sda1), a file system label specification (LABEL=/), or a devlabel-managed symbolic link (/dev/homedisk)
Mount point -- Except for swap partitions, this field specifies the mount point to be used when the file system is mounted (/boot)
File system type -- The type of file system present on the specified device (note that auto may be specified to select automatic detection of the file system to be mounted, which is handy for removable media units such as diskette drives)
Mount options -- A comma-separated list of options that can be used to control mount‘s behavior (noauto,owner,kudzu)
Dump frequency -- If the dump backup utility is used, the number in this field controls dump‘s handling of the specified file system
File system check order -- Controls the order in which the file system checker fsck checks the integrity of the file systems
损坏的磁盘阵列修复
发现某块磁盘出了问题后，使用mdadm命令移除磁盘。查看磁盘状态。
mdadm /dev/md0 -f /dev/sdb 模拟sdb出现问题 、
mdadm -D /dev/md0 查看整列状态，注意 faulty位置/
umount 移除整列位于的文件夹
mdadm /dev/md0 -a /dev/sdb （-a = add 热加入。在无法添加的情况下使用--re-add命令）
resize2fs /dev/storage/vo ext2/ext3/ext4 file system resizer 重置容量。
缩小逻辑卷
resize2fs /dev/storage/vo 120M
lvreduce -L 120M /dev/storage/vo
注意扩容和缩小的操作顺序。
If you wish to shrink an ext2 partition, first use resize2fs to shrink the size of filesystem.Then you may use fdisk(8) to shrink the size of the partition. When shrinking the size of the partition, make sure you do not make it smaller than the new size of the ext2 filesystem!
