Common disk management tools

Common disk management tools

1. make2fs - ext series of file system management tool

• -t {ext2 | ext3 | ext4} specifies the file system type
• -b {1024 | 2048 | 4096} specify the file system block size
• -L specified volume label
• -j Create a log function with ext3
• -i bypte-per-inode the inode bytes specified ratio; and the number of bytes not create an inode
• -N directly specify how many inode creation
• -m specified percentage of space reserved for the root user
• -O holding of specified when creating the file system

2. tune2fs - ext modify certain properties

Block size can not be adjusted

-l listed in the superblock

Modify the properties:

-j will upgrade ext2 to ext3

-L modify the label

-m modify the percentage reserved for root

When the holding of the -O [^] mount options specify the file system is created

3. dumpe2fs Show Details ext file system

-h View superblock information

4. fsck manually perform file system detected

-t specifies the file system type (not specified)

-a no need of repair Interactive

-f interactive repair

5. blkid View UUID

The positioning device -L LABEL

The positioning device -U UUID

6. mount

mount [-rwn] [-t vfstype] [-o options] device dir

-r mount read-only

-w write mount

-N By default mount unloading operations will be synchronized to the / etc / mtab -n prohibited under this feature

When the volume label indicates the device mounted -L

-U in a manner specified device UUID

Mount the file system characteristics -o:

sync / async: synchronous / asynchronous

atime / noatime: Update / time stamp is not updated

diratime / dirnoatime directory update / non-update timestamp

remount remount

acl Access Control Lists

ro Tada读

rw read and write

Whether to allow the dev / nodev this device create a device file;

Whether files on exec / noexec equipment executable;

user / nouser whether to allow ordinary users to mount

suid / nosuid suid and sgid on whether to allow the entry into force of the program files

defaults： rw suid dev exec auto nouser async relatime

A tips

mount --bind source directory target directory

7. umount

lsof mount_point

fuser -km mount_point kill all processes of occupation

8. /etc/fstab

• Device file / UUID
• Mount points
  
• Mount Type
  
• Mount Options
  
• Dump frequency
  • 0 never Backup
  • 1 daily backups
  • 2 every other day
• Self-test order
  • 0 slatternly
  • 1 First self-test, usually only the root file system
  • 2 secondary self-test
  • ...
  • 9