Shulou(Shulou.com)06/02 Report--

Linux capacity expansion: change the system id of the partition to lvm (8e) with fdisk before the partition capacity expansion

Create a logical volume:

Create PV (convert physical volumes)-- > create VG--- > create LV and format

Fdisk / dev/sdb, create partition and change id to 8e

Fdisk / dev/sdc create partition and change id to 8e

Fdisk / dev/sdd create partition and change id to 8e

Pvscan to see if physical volumes are currently available

Pvdisplay

1. [root@localhost ~] # pvcreate / dev/sdb1

Physical volume "/ dev/sdb1" successfully created.

[root@localhost ~] # pvcreate / dev/sdc1

Physical volume "/ dev/sdc1" successfully created.

[root@localhost ~] # pvcreate / dev/sdc1

Physical volume "/ dev/sdc1" successfully created.

[root@localhost ~] #

2. Create a volume group VG

Vgscan 、 vgdisplay

[root@localhost ~] # vgscan

Reading volume groups from cache.

[root@localhost ~] # vgcreate mail_store / dev/sdc1 / dev/sdb1 / dev/sdd1

Volume group "mail_store" successfully created

[root@localhost ~] #

3. Create LV

[root@localhost ~] # lvscan

[root@localhost ~] # lvdisplay

[root@localhost ~] #

[root@localhost ~] # lvcreate-L 15G (size)-n mail (name) mail_store (volume group)

Logical volume "mail" created.

[root@localhost ~] # lvscan

ACTIVE'/ dev/mail_store/mail' [15.00 GiB] inherit

[root@localhost ~] # lvdisplay

-Logical volume

LV Path / dev/mail_store/mail

LV Name mail

VG Name mail_store

LV UUID j5Hvhi-ppem-Okz1-CV0o-SnKY-Gkdk-lr2zXU

LV Write Access read/write

LV Creation host, time localhost.localdomain, 2019-12-01 03:11:40 + 0800

LV Status available

Open 0

LV Size 15.00 GiB

Current LE 3840

Segments 2

Allocation inherit

Read ahead sectors auto

Currently set to 8192

Block device 253:0

Format lv to ext4 file type: mkfs-t ext4 / dev/mail_store/mail

[root@localhost] # mkfs-t ext4 / dev/mail_store/mail

Mke2fs 1.42.9 (28-Dec-2013)

File system label =

OS type: Linux

Block size = 4096 (log=2)

Chunk size = 4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

983040 inodes, 3932160 blocks

196608 blocks (5.00%) reserved for the super user

First data block = 0

Maximum filesystem blocks=2151677952

120 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Allocating group tables: done

Writing inode table: complete

Creating journal (32768 blocks): complete

Writing superblocks and filesystem accounting information: done

Mount lv to the / mnt directory: mount / dev/mail_store/mail / mnt/

[root@localhost ~] # mount / dev/mail_store/mail / mnt/

[root@localhost ~] # df-Th

File system type capacity used available used mount point

/ dev/sda2 ext4 17G 3.5G 13G 22% /

Devtmpfs devtmpfs 897M 0 897m 0% / dev

Tmpfs tmpfs 912M 0912m 0% / dev/shm

Tmpfs tmpfs 912m 9.1m 903m 1% / run

Tmpfs tmpfs 912M 0912m 0% / sys/fs/cgroup

/ dev/sda1 xfs 1014M 175M 840M 18% / boot

Tmpfs tmpfs 183M 20K 183M 1% / run/user/1000

/ dev/sr0 iso9660 3.8G 3.8G 0100% / run/media/mcq/RHEL-7.4 Server.x86_64

Tmpfs tmpfs 183M 0 183M 0% / run/user/0

/ dev/mapper/mail_store-mail ext4 15G 41m 14G 1% / mnt

[root@localhost ~] #

Summarize the steps:

A, pvcreate / dev/sdc1 create a new pv partition

Note: a possible error may be reported. You need to update the partition table, execute partprobe, and then execute

Partprobe

[root@localhost ~] # pvcreate / dev/sdb2

Physical volume "/ dev/sdb2" successfully created.

B. Vgextand ROOT / dev/sdc1 expands the new pv partition to vg group ROOT

[root@localhost ~] # vgextend VAR / dev/sdb2

Volume group "VAR" successfully extended

C, lvextend / dev/VAR/var / dev/sdb2 or lvextend-L + 20g / dev/VAR/var put the newly expanded space into the lv volume

[root@localhost ~] # lvextend / dev/VAR/var / dev/sdb2

Size of logical volume VAR/var changed from 2.00 GiB (512 extents) to

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