先確認目前的磁碟狀況
[root@localhost ~]# fdisk -l Disk /dev/sda: 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 Disk label type: dos Disk identifier: 0x00073f29 Device Boot Start End Blocks Id System /dev/sda1 * 2048 2099199 1048576 83 Linux /dev/sda2 2099200 104857599 51379200 8e Linux LVM Disk /dev/mapper/centos-root: 48.4 GB, 48444211200 bytes, 94617600 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: 4160 MB, 4160749568 bytes, 8126464 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
發現擴充的空間沒有吃進去，接著有兩種做法
1. 重新開機
2. 使用 echo 1 > /sys/block/sda/device/rescan 做重新掃描
在不影響運作的狀況下選擇使用 echo 1 > /sys/block/sda/device/rescan
然後再做一次 fdisk -l 確認是否有吃進去
[root@localhost ~]# echo 1 > /sys/block/sda/device/rescan [root@localhost ~]# fdisk -l Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x00073f29 Device Boot Start End Blocks Id System /dev/sda1 * 2048 2099199 1048576 83 Linux /dev/sda2 2099200 104857599 51379200 8e Linux LVM Disk /dev/mapper/centos-root: 48.4 GB, 48444211200 bytes, 94617600 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: 4160 MB, 4160749568 bytes, 8126464 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
確認吃進去後我們開始建立新的分割
[root@localhost ~]# fdisk /dev/sda
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): p
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x00073f29
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3):
First sector (104857600-251658239, default 104857600):
Using default value 104857600
Last sector, +sectors or +size{K,M,G} (104857600-251658239, default 251658239):
Using default value 251658239
Partition 3 of type Linux and of size 70 GiB is set
Command (m for help): t
Partition number (1-3, default 3):
Hex code (type L to list all codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes):8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x00073f29
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
/dev/sda3 104857600 251658239 73400320 8e Linux LVM
Command (m for help): p
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x00073f29
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
/dev/sda3 104857600 251658239 73400320 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
分割區做好之後開始同步partition資訊
[root@localhost ~]# partprobe
然後將新的 partition 加入PV
[root@localhost ~]# pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created.
先確定 VG Name
[root@localhost ~]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size <49.00 GiB PE Size 4.00 MiB Total PE 12543 Alloc PE / Size 12542 / 48.99 GiB Free PE / Size 1 / 4.00 MiB VG UUID EkuUeX-v8uq-hZei-6bye-kQci-JMsH-vNhUEw
在這台機器的 VG Name 是 centos
接下來用 vgextend 做擴充的動作
[root@localhost ~]# vgextend centos /dev/sda3 Volume group "centos" successfully extended
擴充完 VG 後接下來是擴充到 LV 上面
在擴充之前要先看一下需要擴充到那個路徑
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 41M 3.8G 2% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/mapper/centos-root 46G 2.3G 43G 6% / /dev/sda1 1014M 188M 827M 19% /boot tmpfs 783M 0 783M 0% /run/user/0
這邊要針對主要區域做擴充所以選擇 /dev/mapper/centos-root 這個路徑
[root@localhost ~]# lvextend -l+100%FREE /dev/mapper/centos-root Size of logical volume centos/root changed from <45.12 GiB (11550 extents) to <115.12 GiB (29470 extents). Logical volume centos/root successfully resized.
完成後確認一下 LV 是不是有成功擴充進去
[root@localhost ~]# lvdisplay /dev/mapper/centos-root --- Logical volume --- LV Path /dev/centos/root LV Name root VG Name centos LV UUID OMpiPi-3e17-jART-5Juj-o1Fa-ZusK-lLj2ec LV Write Access read/write LV Creation host, time localhost.localdomain, 2019-10-16 12:38:56 +0800 LV Status available # open 1 LV Size <115.12 GiB Current LE 29470 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0
確認 LV 已經擴充之後就開始做 filesystem xfs 擴充
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=2956800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=11827200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=5775, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 11827200 to 30177280
filesystem xfs 擴充完畢後再來確認一次空間是否有加大
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 41M 3.8G 2% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/mapper/centos-root 116G 2.3G 113G 2% / /dev/sda1 1014M 188M 827M 19% /boot tmpfs 783M 0 783M 0% /run/user/0
確認空間有加大之後就完成所有的步驟了