LVM Logical Volume Management

LVM: Logical Volume Manager (Logical Volume Manager)

Combine multiple physical disk partitions (PVS) into large volume groups (VG), and then partition the required size from the large volume group (LV)

• PV (physical Volume, physical volume)

• VG (Volume Group, Volume group)

• PE (physical Extend, physical expansion block): PE is the minimum storage block for LVM, a bit like the file system block

• LV (Logical Volume, Logic extension block): System ID = 8e

Characteristics

• Dynamically adjust file system size, add capacity on demand

• Support for snapshot backups

implementation Process :

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Create, modify, close steps

1:PV

• pvcreate/dev/sda{7,8,9}

• View: Pvscan Pvdisplay//Legend is just an example

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2:VG

• vgcreate [-S definition pe size] VG group name/dev/sda{7,8,9}

• View Vgscan, Vgdisplay

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3 Increase/Decrease PV amount in VG:

• Vgextend/vgreduce VG Group name PV

Delete VG:

• Vgremove

3:LV

• Lvcreate [-L allocated PE number] [-l allocated size, must be an integer multiple of PE size]-n LV name VG name

• Lvdisplay

4: format the LV, and mount the use

• LV Device Name and directory example:/DEV/BOXINVG/BOXINLV or/DEV/MAPPER/BOXINVG-BOXINLV

5: zoom in on LV and file system capacity

• Lvresize [-L +/-increase/decrease PE number] [-l +/-increase/decrease size] Device

• You can use the lvdisply command to see that the LV is increased but the file system does not grow

• RESIZE2FS [Device]//Dynamic Extended file system capacity to the same as LV, if added file size, expand to the specified size

6: reduce LV and file system capacity

• Reduce file system size first

1: Uninstall

2: Disk check e2fsck-f [device]

3: Shrink file system resize2fs [device] [size]

• Finally zoom out LV

7: Remove LV

• First take advantage of Pvmove [LV to remove] [others can accommodate LV to remove the number of PE in LV]//PE transfer of LV to be removed

• Vgreduce VG Group [LV to remove]//Removed from VG

• pvremove [LV to remove]

8: Turn off LVM

• Uninstall all LVM file systems first

• Lvremove Delete LV

• Vgchange-an vgname//Let VG not have active flag, equivalent to shutdown

• Vgremove Delete VG

• Pvremove removing PV

• Delete the partition, or change the system ID back to 82 later use

This article is from the "Call Me boxin" blog, so be sure to keep this source http://boxinknown.blog.51cto.com/10435935/1664037

LVM Logical Volume Management