LVM and disk quotas

LVM and disk quotas

A, LVM Overview

LYM is the Linux system to a logical disk partition management mechanism, which is based on the hard disk and the partition, a file system under the logical layer, the lower layer disk partition layout screen when a file system, it is possible to maintain dynamic disk capacity adjustment in the case of existing data unchanged, thereby increasing the flexibility of disk management.

• Logical Volume Manager, logical volume management
  • Dynamic adjustment disk capacity, disk management to improve flexibility
  • / Boot partition for storing boot files can not be created on LVM
  • Graphical Interface Management
  • system-config-lvm

• The basic concept of the mechanism of LVM

  • PV (physical volume)
  • VG (volume group)
  • LV (Logical Volume)
    

    LVM administration commands

    * Main command

    
    

    Note: We will convert the disk format, is converted to a format you can create LVM

    Case

    
    
    
    The first step Subdivision, as shown:
    
    Creating partitions
    
    
    
    
    and then need to do a physical volume:
    
    
    here ".." indicates continuous
    at this time to see if there is a physical volume
    
    
    

    The basic unit of the size of each PE 4MB

    In this case the logical volume is divided, as shown:
    
    
    
    
    at which time expansion space:

After completion of the addition must be formatted as:

create a mount point:



At this view:

carry out!

Disk quotas

Achieve conditions disk quota

• Linux kernel support needed
• Installation xfsprogs and quota package

  Features Linux disk quota

• Range: for a specified file system (partition)
• Restrictions target: user accounts, group accounts
• Limit Type: disk capacity, the number of files
• Restriction method: soft limit, hard limit
  

  Enable file system quota support

  

  Note: usrquota for a user group for grpquota

  Edit user and group account quota settings

  

• -u Specifies the user
• -g specified group account
• -x Enable Expert Mode
• Use -c command

  Verify Disk quota feature

  • Switch to set the quota partition (mount directory)
  • Creates a specified number of files: use the touch command, or cp command
  • Create a file designated capacity: Use the dd command, or cp command

    Check quota usage

    

• -a View all
• -u user view
• -g View Group
• -b output report
• -i View node information

  Case:

  Node capacity disk quota soft limit hard limit
  viewing installed packages
  
  

  Attachment: Close Enhanced security features, without closing the quota function can not be written

  
  
  
  At this time, need to be remounted:
  
  the next node verifies:
  
  
  At this verification Capacity:
  Note: if the take place of ... ... ... file generated from
  
  

  As long as there is a limit of two kinds of ultra-limit, it can not be written to use.

  This chapter concludes:

  Dynamic disks using LVM scheme, the flexibility to expand disk space, the basic process of creating and using LVM scheme:

• Create a physical volume
• Create a volume group
• Creating a Logical Volume
• Format File System
• Hanging in