linux 根目录扩容
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参考技术A 因为是在虚拟机上做的实验，故以虚拟机作为模板介绍1、虚拟机增加容量，我增加了40G
2、进centos 7系统，按Ctrl+alt+F5，进入命令符界面，为何不进入桌面模式，因为要修改home空间容量，所以直接命令符界面进入root模式
3、输入fdisk- l 查看系统容量，注意root盘名称，我的是cl，然后输入df -h 查看各个根目录的占用空间容量
4、对增加的分区进行分区操作 命令：fdisk /dev/sda
5、对分区完毕的分区进行lvm格式转换，8e
6、创建pv pvcreate /dev/sda3
7、查看当前卷组情况 vgdisplay 查看free pe /size 有无空间
8、扩展逻辑卷(根目录"/"的挂载点)
>lvextend -L +25G /dev/cl/root /dev/sda3
>lvextend -L +15G /dev/cl/root/home /dev/sda3
>/sbin/resize2fs /dev/cl/home
9、系统重新识别
>xfs_growfs /dev/cl/home
>xfs_growfs /dev/cl/root
linux根目录扩容
1、查看新添加的磁盘，如下: /dev/sde为新添加磁盘
可用如下脚本进行扫描
echo ‘ - - - ‘ > /sys/class/scsi_host/host0/scan
[[email protected] ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x00028c6a
Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 26 2611 20765696 8e Linux LVM
Disk /dev/sde: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 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
Disk /dev/mapper/vg_rac01-LogVol01: 12.7 GB, 12670992384 bytes
255 heads, 63 sectors/track, 1540 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
Disk /dev/mapper/vg_rac01-LogVol00: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 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
2、对磁盘进行分区，将其划分为一个主分区，并创建PV
[[email protected] ~]# fdisk /dev/sde
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x6751fd38.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won‘t be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It‘s strongly recommended to
switch off the mode (command ‘c‘) and change display units to
sectors (command ‘u‘).
Command (m for help): n #n为新建一个分区
Command action
e extended
p primary partition (1-4)
p #p为新建一个primary partition，即主分区
Partition number (1-4):
Value out of range.
Partition number (1-4): 1 #分区序号为1
First cylinder (1-1044, default 1): #默认从第一个柱面开始
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1044, default 1044): #默认到最后一个柱面结束
Using default value 1044
Command (m for help): t #改变分区格式为8e 即Linux LVM逻辑卷格式
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w #保存退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
3、查看创建情况
[[email protected] ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x00028c6a
Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 26 2611 20765696 8e Linux LVM
Disk /dev/sde: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 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: 0x6751fd38
Device Boot Start End Blocks Id System
/dev/sde1 1 1044 8385898+ 8e Linux LVM
Disk /dev/mapper/vg_rac01-LogVol01: 12.7 GB, 12670992384 bytes
255 heads, 63 sectors/track, 1540 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
Disk /dev/mapper/vg_rac01-LogVol00: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 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
4、创建物理卷组
[[email protected] ~]# pvcreate /dev/sde1
Physical volume "/dev/sde1" successfully created
[[email protected] ~]# pvdisplay #查看物理卷组情况
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_rac01
PV Size 19.80 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 5069
Free PE 0
Allocated PE 5069
PV UUID vHMLej-bAqh-yugI-UbFf-OyTC-31Yt-xouKeY
"/dev/sde1" is a new physical volume of "8.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sde1
VG Name
PV Size 8.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 7axfPk-Xxfg-HWQS-gBjj-GD0Q-xFgU-e9apR7
5、查看物理卷组
[[email protected] ~]# pvscan
PV /dev/sda2 VG vg_rac01 lvm2 [19.80 GiB / 0 free]
PV /dev/sde1 lvm2 [8.00 GiB]
Total: 2 [27.80 GiB] / in use: 1 [19.80 GiB] / in no VG: 1 [8.00 GiB]
6、扩展物理卷
[[email protected] ~]# vgextend vg_rac01 /dev/sde1
Volume group "vg_rac01" successfully extended
[[email protected] ~]# vgdisplay
--- Volume group ---
VG Name vg_rac01
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 27.80 GiB
PE Size 4.00 MiB
Total PE 7116
Alloc PE / Size 5069 / 19.80 GiB
Free PE / Size 2047 / 8.00 GiB
VG UUID z1Fila-7Cwx-8m9K-XQMG-UK4a-4iLq-kibPv2
7、查看逻辑卷
[[email protected] ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_rac01/LogVol01
LV Name LogVol01
VG Name vg_rac01
LV UUID mnT2Gu-OfUY-sBvc-mbU3-P1gZ-BJcC-S1QXcl
LV Write Access read/write
LV Creation host, time rac01, 2017-03-07 14:40:50 +0800
LV Status available
# open 1
LV Size 11.80 GiB
Current LE 3021
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_rac01/LogVol00
LV Name LogVol00
VG Name vg_rac01
LV UUID OJGG6E-dGBl-RBWB-pWcH-Utu2-sT3i-kvVt9k
LV Write Access read/write
LV Creation host, time rac01, 2017-03-07 14:40:55 +0800
LV Status available
# open 1
LV Size 8.00 GiB
Current LE 2048
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
9、查看情况
[[email protected] ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_rac01 2 2 0 wz--n- 27.80g 8.00g
[[email protected] ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
LogVol00 vg_rac01 -wi-ao---- 8.00g
LogVol01 vg_rac01 -wi-ao---- 11.80g
10、扩展逻辑卷 全部扩展
[[email protected] ~]# lvextend -l +100%FREE /dev/mapper/vg_rac01-LogVol01
Size of logical volume vg_rac01/LogVol01 changed from 11.80 GiB (3021 extents) to 19.80 GiB (5068 extents).
Logical volume LogVol01 successfully resized
[[email protected] ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_rac01 2 2 0 wz--n- 27.80g 0
[[email protected] ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
LogVol00 vg_rac01 -wi-ao---- 8.00g
LogVol01 vg_rac01 -wi-ao---- 19.80g
[[email protected] ~]# resize2fs /dev/mapper/vg_rac01-LogVol01
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_rac01-LogVol01 is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/mapper/vg_rac01-LogVol01 to 5189632 (4k) blocks.
The filesystem on /dev/mapper/vg_rac01-LogVol01 is now 5189632 blocks long.
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