Linux increases LV (logical volume) capacity

Linux increases LV (logical volume) capacity2017-09-29-17:34:13

Personal original Blog, reproduced please indicate the source.

To view the relevant commands for a logical volume:

LVS VGS

Command:

[Email protected] ~]# VGS

VG #PV #LV #SN Attr vsize vfree

Vg_arch 1 4 0 wz--n-544.01g 0

[Email protected] ~]# PVs

PV VG Fmt Attr PSize pfree

/dev/sda2 vg_arch lvm2 a--u 544.01g 0

Command Df-h

looking at the existing disks, we found that the disk SDB has 1305 cylinders, each of which is 8225280 bytes (approximately 8M). There is a disk partition SDB1, only 650 cylinders are used, and the remaining 655 cylinders are not used.

Command Fdisk-l

create a new partition on disk SDB

command:fdisk/dev/sdb

enter p to print an existing partition (not yet partitioned)

Enter n New partition

enter p to establish the primary partition (at which point P is after n, not printed)

Enter 2 to establish a second primary partition

the partition start position can be directly carriage return, default is 651

the last position of the partition can be directly carriage return, default is 1305

Enter p to print the partition and find that a partition/DEV/SDB2 has been established, but this partition is in Linux format

because partition/DEV/SDB2 is in linux format, we need to change the system identifier for the Linux LVM format:

Enter T to change the properties of the partition

entering 2 means changing the properties of the second partition

input 8e change partition 1 for Linux LVM format

enter P print partition and find the established partition/DEV/SDB1 for Linux LVM format

input W Save partition

To make kernel read the partition table again

command:partprobe

But there was some warning about SDB, rebooting the system.

command:reboot

using Fdisk-l again to view the disk in the system found a/DEV/SDB2 partition on/DEV/SDB that already has a Linux LVM format

Create PV:

Create PV:pvcreate/dev/sdb2

View System PV:pvscan

so we're going to create a 5.02G PV

Increase VG Capacity:

added VG:vgextend vg_test/dev/sdb2

View VG:vgdisplay

This allows us to increase the vg_test by 5.02G (1284 free PE, to remember this number)

increase LV Capacity:

Increase Lv:lvresize-l +1284/dev/vg_test/lv_test (1284 is the number of free PE in VG)

View Lv:lvdisplay

so we can increase the capacity of the lv_test to 9.99G.

increase the file system capacity:

command:resize2fs/dev/vg_test/lv_test

file system Lv_test has been increased from 4.9G to 9.9G

at this point, it's done!

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Linux increases LV (logical volume) capacity