CentOS分区 centos

分区格式化查看分区信息
fdisk -l

[root@www application]# fdisk -l WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.Disk /dev/sda: 6001.2 GB, 6001175126016 bytes, 11721045168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk label type: gpt Disk identifier: B408EEC8-6FC3-4F9B-B726-EB390EF3469D#StartEndSizeTypeName 1204840951MBIOS boot 2409621012471GMicrosoft basic 32101248117210439675.5TLinux LVM WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.Disk /dev/sdc: 6001.2 GB, 6001175126016 bytes, 11721045168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk label type: gpt Disk identifier: 44D5CA56-C9DA-437F-916D-F043BD79B458#StartEndSizeTypeNameDisk /dev/sdb: 6001.2 GB, 6001175126016 bytes, 11721045168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/vg-root: 5986.3 GB, 5986332966912 bytes, 11692056576 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/vg-swap: 12.7 GB, 12683575296 bytes, 24772608 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/vg-tmp: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes

查看已分区信息

[root@www application]# df -H FilesystemSizeUsed Avail Use% Mounted on devtmpfs13G013G0% /dev tmpfs13G013G0% /dev/shm tmpfs13G9.4M13G1% /run tmpfs13G013G0% /sys/fs/cgroup /dev/mapper/vg-root6.0T1.6G5.7T1% / /dev/sda21.1G125M880M13% /boot /dev/mapper/vg-tmp1.1G2.7M951M1% /tmp tmpfs

格式化分区

# 格式化为xfs格式 mkfs.xfs/dev/sdb

如果格式化成ext4模式，执行以下命令

# 格式化为ext4格式 mkfs -t ext4 /dev/sdb

挂载分区挂载分区

mount /dev/sdb/home/sdb

开机自动挂载
如果是ext4格式, 将下面的xfs 改成 ext4

vim/etc/fstab /* 添加如下信息*/ /dev/sdb /home/sdbxfs defaults0 0

添加分区到卷组分区除了挂载到指定目录外，还可以添加到卷组，这样可以将不同分区挂载到同一目录
pv、vg、lv的意思

文章图片

物理卷（Physical Volume,PV）：就是指硬盘分区，也可以是整个硬盘或已创建的软RAID，是LVM的基本存储设备。
卷组（Volume Group,VG）：是由一个或多个物理卷所组成的存储池，在卷组上能创建一个或多个逻辑卷。
逻辑卷（Logical Volume,LV）：类似于非LVM系统中的硬盘分区，它建立在卷组之上，是一个标准的块设备，在逻辑卷之上可以建立文件系统。
1. 创建PV(Physical Volume)
pvcreate /dev/sdb

[root@www application]# pvcreate /dev/sdb WARNING: ext4 signature detected on /dev/sdb at offset 1080. Wipe it? [y/n]: y Wiping ext4 signature on /dev/sdb. Physical volume "/dev/sdb" successfully created.

2. 把PV加入VG(Volume Group)中
相当于扩充VG的大小,

使用vgs查看vg组:

[root@www application]# vgs VG #PV #LV #SN AttrVSizeVFree vg130 wz--n- <5.46t 4.00m

可以看到有一个名称为"vg"的卷组， PV物理卷1个， LV逻辑卷3个, 可用空间5.46T
pvs查看这1个物理卷

[root@www application]# pvs PVVG FmtAttr PSizePFree /dev/sda3vg lvm2 a--<5.46t4.00m /dev/sdblvm2 ---<5.46t <5.46t

可以发现已经加入卷组的/dev/sda3物理卷，未加入卷组的/dev/sdb物理卷
【CentOS分区】lvs查看这3个逻辑卷:

[root@www application]# lvs LVVG AttrLSizePool Origin Data%Meta%Move Log Cpy%Sync Convert root vg -wi-ao----5.44t swap vg -wi-ao---- 11.81g tmpvg -wi-ao----1.00g

将/dev/sdb加入VG
vgextend vg(卷组名称) /dev/sdb(PV,物理卷)

[root@www application]# vgextend vg /dev/sdb Volume group "vg" successfully extended# 删除PV卷可以用命令 # vgreduce vg /dev/sdc

查看vgs、lvs、pvs的变化

[root@www application]# vgs VG #PV #LV #SN AttrVSizeVFree vg230 wz--n- <10.92t <5.46t/* sdb的容量添加进来的 */ [root@www application]# lvs LVVG AttrLSizePool Origin Data%Meta%Move Log Cpy%Sync Convert root vg -wi-ao----5.44t swap vg -wi-ao---- 11.81g tmpvg -wi-ao----1.00g [root@www application]# pvs PVVG FmtAttr PSizePFree /dev/sda3vg lvm2 a--<5.46t4.00m /dev/sdbvg lvm2 a--<5.46t <5.46t/* 成功加入了vg */

除了lvs， vgs、pvs都有sdb加入后的变化
LV(Logicl Volume)扩容
将sdb的容量添加到LV中

lvextend -l +100%FREE /dev/mapper/vg-root # 扩展全部空间到lv中去，后面的/dev/mapper/vg-root是指定扩展的文件位置，可在df -hT中看见# 也可以加指定容量 # lvextend -L +20G /dev/mapper/centos-root# 减少容量: # lvreduce -L -3G /dev/mapper/vg-root

再查看lvs, 容量已经增加了

[root@www application]# lvs LVVG AttrLSizePool Origin Data%Meta%Move Log Cpy%Sync Convert root vg -wi-ao---- 10.90t# 增加了sdb的容量 swap vg -wi-ao---- 11.81g tmpvg -wi-ao----1.00g
重新读取VG大小
此时查看df -hT

[root@www application]# df -hT FilesystemSizeUsed Avail Use% Mounted on devtmpfs13G013G0% /dev tmpfs13G013G0% /dev/shm tmpfs13G9.4M13G1% /run tmpfs13G013G0% /sys/fs/cgroup /dev/mapper/vg-root6.0T1.6G5.7T1% /# 没有增加sdb的容量 /dev/sda21.1G125M880M13% /boot /dev/mapper/vg-tmp1.1G2.7M951M1% /tmp tmpfs2.6G02.6G0% /run/user/0

如果是ext文件系统，使用 resize2fs /dev/mapper/vg-root 命令
如果是xfs文件系统，使用 xfs_growfs /dev/mapper/vg-root 命令

[root@www application]# resize2fs /dev/mapper/vg-root resize2fs 1.42.9 (28-Dec-2013) Filesystem at /dev/mapper/vg-root is mounted on /; on-line resizing required old_desc_blocks = 697, new_desc_blocks = 1396 The filesystem on /dev/mapper/vg-root is now 2926638080 blocks long.

再次用df -hT查看已分区信息

[root@www application]# df -hT FilesystemTypeSizeUsed Avail Use% Mounted on devtmpfsdevtmpfs12G012G0% /dev tmpfstmpfs12G012G0% /dev/shm tmpfstmpfs12G9.0M12G1% /run tmpfstmpfs12G012G0% /sys/fs/cgroup /dev/mapper/vg-root ext411T1.4G11T1% /# sdb的容量已经添加进来了 /dev/sda2ext21008M119M839M13% /boot /dev/mapper/vg-tmpext4976M2.6M907M1% /tmp tmpfstmpfs2.4G02.4G0% /run/user/0

完