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| # 1、增加新硬盘空间
# 2、动态识别新加硬盘
[root@lvm-server ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
# 2.1、查看识别后的所有硬盘信息
[root@lvm-server ~]# lsblk
# 3、格式化硬盘
[root@lvm-server ~]# fdisk /dev/sdc
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xa824af8e.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-10485759, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-10485759, default 10485759):
Using default value 10485759
Partition 1 of type Linux and of size 5 GiB is set
Command (m for help): p
Disk /dev/sdc: 5368 MB, 5368709120 bytes, 10485760 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xa824af8e
Device Boot Start End Blocks Id System
/dev/sdc1 2048 10485759 5241856 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@lvm-server ~]# partprobe
# 将新加的硬盘创建成pv
[root@lvm-server ~]# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created.
[root@lvm-server ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <19.50g 0
/dev/sdb1 centos lvm2 a-- <5.00g 2.00g
/dev/sdc1 lvm2 --- <5.00g <5.00g
# 将新加的磁盘空间添加到centos VG组里
[root@lvm-server ~]# vgextend centos /dev/sdc1
Volume group "centos" successfully extended
# 查看信息 /dev/sdc1 已经被绑定
[root@lvm-server ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <19.50g 0
/dev/sdb1 centos lvm2 a-- <5.00g 2.00g
/dev/sdc1 centos lvm2 a-- <5.00g <5.00g
# 再次查看centos这个VG组容量已经扩充了，但是也只有底层的VG扩充了lv此时还没变
[root@lvm-server ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 3 3 0 wz--n- <29.49g <7.00g
# 扩充lv的大小
[root@lvm-server ~]# lvextend -L +3G /dev/mapper/centos-home
Size of logical volume centos/home changed from 11.49 GiB (2942 extents) to 14.49 GiB (3710 extents).
Logical volume centos/home successfully resized.
# 不过逻辑卷lv扩容了，但是没有真正的增加到实际空间上去
[root@lvm-server ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 591M 0 591M 0% /dev
tmpfs 603M 0 603M 0% /dev/shm
tmpfs 603M 9.2M 594M 2% /run
tmpfs 603M 0 603M 0% /sys/fs/cgroup
/dev/mapper/centos-root 10G 1.3G 8.8G 13% /
/dev/sda1 509M 131M 379M 26% /boot
/dev/mapper/centos-home 12G 33M 12G 1% /home
tmpfs 121M 0 121M 0% /run/user/0
[root@lvm-server ~]# xfs_info /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=512 agcount=6, agsize=556544 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=3012608, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@lvm-server ~]# xfs_growfs /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=512 agcount=6, agsize=556544 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=3012608, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 3012608 to 3799040
# 经过xfs_info和xfs_growfs的操作后实际空间也随之增加了
[root@lvm-server ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 591M 0 591M 0% /dev
tmpfs 603M 0 603M 0% /dev/shm
tmpfs 603M 9.2M 594M 2% /run
tmpfs 603M 0 603M 0% /sys/fs/cgroup
/dev/mapper/centos-root 10G 1.3G 8.8G 13% /
/dev/sda1 509M 131M 379M 26% /boot
/dev/mapper/centos-home 15G 33M 15G 1% /home
tmpfs 121M 0 121M 0% /run/user/0
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