Partition expansion of centos7 / redhat 7
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
