centos 增加分区容量
增加完新硬盘后，执行以下命令
/sys/class/scsi_host/
[root@centos4 scsi_host]# ls
host0 host1 host2
有几个host就刷几次
[root@centos4 scsi_host]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@centos4 scsi_host]# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@centos4 scsi_host]# echo "- - -" > /sys/class/scsi_host/host2/scan
刷新后悔出现/dev/sdb1之类的新设备
刷新后悔出现/dev/sdb1之类的新设备
1. 登录到系统中，查看硬盘情况。 /dev/sdb就是新增加的硬盘。（如果sda的空间没有用完，可以对sda进行以下操作）
lsblk #也可以用fdisk -l 查看
分区后重启或用partprobe刷新 [root@controller ~]# fdisk -l
Disk /dev/sda: 23.6 GB, 23593779200 bytes, 46081600 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: 0x000ac27e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 46079999 22526976 8e Linux LVM
Disk /dev/sdb: 85.9 GB, 85899345920 bytes, 167772160 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 /dev/mapper/centos-root: 20.7 GB, 20661141504 bytes, 40353792 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 /dev/mapper/centos-swap: 2361 MB, 2361393152 bytes, 4612096 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
2. 操作/dev/sdb，进行分区，格式化。
[root@controller ~]#
[root@controller ~]#
[root@controller ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
[root@controller ~]#
[root@controller ~]#
[root@controller ~]# fdisk /dev/sdb
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 0xd7252d64.
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
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 (2048-167772159, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-167772159, default 167772159):
Using default value 167772159
Partition 1 of type Linux and of size 80 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@controller ~]#
[root@controller ~]# fdisk -l
Disk /dev/sda: 23.6 GB, 23593779200 bytes, 46081600 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: 0x000ac27e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 46079999 22526976 8e Linux LVM
Disk /dev/sdb: 85.9 GB, 85899345920 bytes, 167772160 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: 0xd7252d64
Device Boot Start End Blocks Id System
/dev/sdb1 2048 167772159 83885056 83 Linux
Disk /dev/mapper/centos-root: 20.7 GB, 20661141504 bytes, 40353792 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 /dev/mapper/centos-swap: 2361 MB, 2361393152 bytes, 4612096 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
3. 修改硬盘类型，修改为linux LVM，代码8e。此步骤也可以在分区步骤中直接完成。
[root@controller ~]#
[root@controller ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
[root@controller ~]#
[root@controller ~]# fdisk /dev/sdb
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.
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sdb: 85.9 GB, 85899345920 bytes, 167772160 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: 0xd7252d64
Device Boot Start End Blocks Id System
/dev/sdb1 2048 167772159 83885056 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@controller ~]#
[root@controller ~]# fdisk -l
Disk /dev/sda: 23.6 GB, 23593779200 bytes, 46081600 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: 0x000ac27e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 46079999 22526976 8e Linux LVM
Disk /dev/sdb: 85.9 GB, 85899345920 bytes, 167772160 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: 0xd7252d64
Device Boot Start End Blocks Id System
/dev/sdb1 2048 167772159 83885056 8e Linux LVM
Disk /dev/mapper/centos-root: 20.7 GB, 20661141504 bytes, 40353792 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 /dev/mapper/centos-swap: 2361 MB, 2361393152 bytes, 4612096 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
partprobe 同步新分区信息，不用重启了
mkfs.ext4 /dev/sdb 格式化新分区
mkfs.ext4 /dev/sdb 格式化新分区
4. 创建 PV。
[root@controller ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.
[root@controller ~]#
5. 查看VG. 注意VG的名称
[root@controller ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz--n- 21.48g 40.00m
[root@controller ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz--n- 21.48g 40.00m
[root@controller ~]#
6. 扩展 VG。
[root@controller ~]# vgextend centos /dev/sdb1
Volume group "centos" successfully extended
[root@controller ~]#
[root@controller ~]# df -hl
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 20G 5.7G 14G 30% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 8.4M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 215M 283M 44% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@controller ~]#
[root@controller ~]# vgextend centos /dev/sdb1
Volume group "centos" successfully extended
[root@controller ~]#
[root@controller ~]# df -hl
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 20G 5.7G 14G 30% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 8.4M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 215M 283M 44% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@controller ~]#
7. 扩展 LV./dev/mapper/centos-root 为根目录。
[root@controller ~]#
[root@controller ~]# lvextend -L +70G /dev/mapper/centos-root /dev/sdb1
Size of logical volume centos/root changed from 19.24 GiB (4926 extents) to 89.24 GiB (22846 extents).
Logical volume centos/root successfully resized.
[root@controller ~]#
[root@controller ~]#
[root@controller ~]# df -hl
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 20G 5.7G 14G 30% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 8.5M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 215M 283M 44% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@controller ~]#
8. 扩展生效。
[root@controller ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=1261056 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0 spinodes=0
data = bsize=4096 blocks=5044224, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
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 5044224 to 23394304
[root@controller ~]#
[root@controller ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 90G 5.7G 84G 7% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 8.5M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 215M 283M 44% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@controller ~]#
[root@controller ~]#
---------------------
作者：李家乐
来源：CSDN
原文：https://blog.csdn.net/weixin_39992639/article/details/79082944
版权声明：本文为博主原创文章，转载请附上博文链接！
[root@controller ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=1261056 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0 spinodes=0
data = bsize=4096 blocks=5044224, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
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 5044224 to 23394304
[root@controller ~]#
[root@controller ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 90G 5.7G 84G 7% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 8.5M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 215M 283M 44% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@controller ~]#
[root@controller ~]#
---------------------
作者：李家乐
来源：CSDN
原文：https://blog.csdn.net/weixin_39992639/article/details/79082944
版权声明：本文为博主原创文章，转载请附上博文链接！
