centos7 磁盘目录扩容
1.使用 fdisk -l 查看到这块新盘为/dev/sde：
Disk /dev/sde: 53.7 GB, 53687091200 bytes, 104857600 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.对新盘分区(不分区也可以)
[root@hxlhost ~]# fdisk /dev/sde
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): 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 (2048-104857599, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599):
Using default value 104857599
Partition 1 of type Linux and of size 50 GiB is set
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): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@hxlhost ~]# partprobe
使用 fdisk 命令对新盘进行分区，这里建立了一个主分区/dev/sde，大小50GB，最后使用 partprobe 命令重新读取分区表：
在分区的过程中，注意设置格式为8e，这是LVM的分区格式。
3、创建物理卷（PV）
使用 pvcreate 命令创建物理卷，pvdisplay 查看物理卷信息:
[root@hxlhost ~]# pvcreate /dev/sde1 ##不分区就是单块磁盘创建pv,如:pvcreate /dev/sde
Physical volume "/dev/sde1" successfully created.
[root@hxlhost ~]# pvscan
PV /dev/sda3 VG vgroot lvm2 [32.80 GiB / 0 free]
PV /dev/sde1 lvm2 [<50.00 GiB]
Total: 2 [<82.80 GiB] / in use: 1 [32.80 GiB] / in no VG: 1 [<50.00 GiB]
若配置了multipath的环境执行命令报如下错误：
[root@rac01 ~]# pvcreate /dev/sdv
Device /dev/sdv excluded by a filter.
解决办法：
修改配置文件
[root@rac01 ~]# more /etc/multipath.conf
blacklist {
devnode "^sda"
devnode "sdv"
}
defaults {
user_friendly_names yes
path_grouping_policy multibus
failback immediate
no_path_retry fail
}
multipaths {
multipath {
wwid VBOX_HARDDISK_VBd39e876e-721b6efb
alias ocrdisk01
path_grouping_policy multibus
}
把sdv加入到白名单，然后重启服务
systemctl restart multipathd.service
4、将PV加入卷组（VG）
使用 vgdisplay 查看卷组信息
[root@hxlhost ~]# vgdisplay
--- Volume group ---
VG Name vgroot
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 32.80 GiB
PE Size 4.00 MiB
Total PE 8397
Alloc PE / Size 8397 / 32.80 GiB
Free PE / Size 0 / 0
VG UUID hDjETu-sNQM-ZpM1-YcPJ-NC6H-8bCS-PedQmr
使用 vgextend 命令把/dev/vdb1加入到centos:
[root@hxlhost ~]# vgextend vgroot /dev/sde1
Volume group "vgroot" successfully extended
[root@hxlhost ~]# vgdisplay
--- Volume group ---
VG Name vgroot
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size <82.80 GiB
PE Size 4.00 MiB
Total PE 21196
Alloc PE / Size 8397 / 32.80 GiB
Free PE / Size 12799 / <50.00 GiB
VG UUID hDjETu-sNQM-ZpM1-YcPJ-NC6H-8bCS-PedQmr
5.创建逻辑卷（LV）&扩容
查看lv
[root@hxlhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vgroot/lvroot
LV Name lvroot
VG Name vgroot
LV UUID wHodVu-dCCm-vndQ-S6IH-jWRY-hNJP-RWBDPH
LV Write Access read/write
LV Creation host, time localhost, 2020-11-06 01:25:50 -0500
LV Status available
# open 1
LV Size 32.80 GiB
Current LE 8397
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
扩容:
[root@hxlhost ~]# lvextend -l +12799 /dev/vgroot/lvroot
Size of logical volume vgroot/lvroot changed from 32.80 GiB (8397 extents) to <82.80 GiB (21196 extents).
Logical volume vgroot/lvroot successfully resized.
或是使用
lvextend -l +100%FREE /dev/vgroot/lvroot
6.使用 xfs_growfs 命令在线调整xfs格式文件系统大小(CentOS6使用resize2fs)：
[root@hxlhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 2.9G 0 2.9G 0% /dev
tmpfs 2.9G 0 2.9G 0% /dev/shm
tmpfs 2.9G 9.1M 2.9G 1% /run
tmpfs 2.9G 0 2.9G 0% /sys/fs/cgroup
/dev/mapper/vgroot-lvroot 33G 22G 12G 66% /
/dev/sda1 197M 144M 54M 73% /boot
tmpfs 581M 0 581M 0% /run/user/0
[root@hxlhost ~]# xfs_growfs /dev/mapper/vgroot-lvroot
meta-data=/dev/mapper/vgroot-lvroot isize=512 agcount=4, agsize=2149632 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=8598528, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=4198, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 8598528 to 21704704
[root@hxlhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 2.9G 0 2.9G 0% /dev
tmpfs 2.9G 0 2.9G 0% /dev/shm
tmpfs 2.9G 9.1M 2.9G 1% /run
tmpfs 2.9G 0 2.9G 0% /sys/fs/cgroup
/dev/mapper/vgroot-lvroot 83G 22G 62G 27% /
/dev/sda1 197M 144M 54M 73% /boot
tmpfs 581M 0 581M 0% /run/user/0
--The End --
