LVM逻辑卷基本操作
2019-03-14 本文已影响0人
ArthurIsUsed
相关命令
- pvcreate /dev/sdb //创建物理卷(VGDA:卷组描述区域)
- pvscan, pvdisplay //扫瞄，显示物理卷
- pvremove /dev/sdb //删除物理卷
[root@KMVS-CENTOS shm]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_kmvscentos
PV Size 79.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 20354
Free PE 0
Allocated PE 20354
PV UUID Ggncx1-y0eb-XVyQ-6jxi-SX35-tzbp-rSeJHP
- vgdisplay 查看卷组，vgcreate 创建卷组
- vgcreate <volume-group1卷组名> /dev/sdb1 /dev/sdb2 /dev/sdb3
- vgremove <volume-group1> //删除卷组
- vgchange -a y // 激活所有卷组
- vgextend <volume-group1> <pv-path> //增大卷组，把新的物理卷加入现在卷组
- vgreduce <volume-group1> <pv-path>//减小卷组，把物理卷从卷组中移出
[root@KMVS-CENTOS shm]# vgdisplay
--- Volume group ---
VG Name vg_kmvscentos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 79.51 GiB
PE Size 4.00 MiB
Total PE 20354
Alloc PE / Size 20354 / 79.51 GiB
Free PE / Size 0 / 0
VG UUID HbeVkk-bnpi-O4NZ-aGzQ-N8jy-D8rZ-QNcqgD
- lvcreate -L 100M -n <lv1逻辑卷名> <volume-group1卷组名> //创建逻辑卷
- lvdisplay
- lvremove /dev/volume-group1/lv1 //删除逻辑卷
- lvresize -L 200M /dev/volume-group1/lv1 // 增大，或 缩小逻辑卷大小
- lvextend -L|--size +逻辑卷大小增量 逻辑卷全路径名 //增大
- lvreduce q -L|--size +逻辑卷减小量 逻辑卷全路径名 //缩小
- lvchange -an <logical volume path> //inactive 逻辑卷
- lvchange -ay <logical volume path>//active 激活逻辑卷
[root@KMVS-CENTOS shm]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_kmvscentos/lv_home
LV Name lv_home
VG Name vg_kmvscentos
LV UUID UoK2Gc-Y1Ec-lJXr-Vv57-xAkc-iZsz-HaAtNV
LV Write Access read/write
LV Creation host, time KMVS-CENTOS, 2013-08-08 12:25:46 +0800
LV Status available
# open 1
LV Size 25.63 GiB
Current LE 6562
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
- 格式化逻辑卷
- sudo mkfs.ext4 /dev/mapper/dataVG-data
- 每次开机自动挂载
- echo "/dev/mapper/dataVG-data /data ext4 defaults,noatime,barrier=0,data=writeback 0 0" | sudo tee -a /etc/fstab
- 建立/data目录，不然挂载不上
- sudo mkdir /data
不重启，显示新硬盘
- 确定主机总线号：
[root@KMVS-CENTOS shm]# ls /sys/class/scsi_host/
host0 host1 host2
- 重新扫描SCSI总线来添加设备：
[root@iNeedle~]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@iNeedle~]# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@iNeedle~]# echo "- - -" > /sys/class/scsi_host/host2/scan
- fdisk -l
Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
添加新硬盘，纳入逻辑卷
- create物理卷
[root@KMVS-CENTOS shm]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
- 扩充逻辑卷
[root@KMVS-CENTOS shm]# vgextend vg_kmvscentos /dev/sdb
Volume group "vg_kmvscentos" successfully extended
[root@KMVS-CENTOS shm]# vgdisplay
--- Volume group ---
VG Name vg_kmvscentos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size 109.50 GiB
PE Size 4.00 MiB
Total PE 28033
Alloc PE / Size 20354 / 79.51 GiB
Free PE / Size 7679 / 30.00 GiB
VG UUID HbeVkk-bnpi-O4NZ-aGzQ-N8jy-D8rZ-QNcqgD
- 给特定逻辑卷增加容量
[root@KMVS-CENTOS shm]# lvresize -L 30G /dev/mapper/vg_kmvscentos-lv_home
Extending logical volume lv_home to 30.00 GiB
Logical volume lv_home successfully resized
[root@KMVS-CENTOS shm]# lvextend -L +25.6G /dev/mapper/vg_kmvscentos-lv_home
Rounding size to boundary between physical extents: 25.60 GiB
Extending logical volume lv_home to 55.60 GiB
Logical volume lv_home successfully resized
- resize2fs /dev/mapper/vg_kmvscentos-lv_home
[root@KMVS-CENTOS shm]# resize2fs /dev/mapper/vg_kmvscentos-lv_home
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_kmvscentos-lv_home is mounted on /home; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 4
Performing an on-line resize of /dev/mapper/vg_kmvscentos-lv_home to 14582784 (4k) blocks.
The filesystem on /dev/mapper/vg_kmvscentos-lv_home is now 14582784 blocks long.
[root@KMVS-CENTOS shm]# df -h
文件系统 容量 已用 可用 已用%% 挂载点
/dev/mapper/vg_kmvscentos-lv_root
50G 14G 33G 30% /
tmpfs 7.9G 292K 7.9G 1% /dev/shm
/dev/sda1 485M 38M 423M 9% /boot
/dev/mapper/vg_kmvscentos-lv_home
55G 20G 33G 39% /home
/dev/sda3 119G 13G 101G 11% /disk
