我的vbox的根目录磁盘空间快不够用了，
[root@testdb2 ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_testdb2-lv_root
27431124 21329720 4707948 82% /
tmpfs 3481600 88 3481512 1% /dev/shm
/dev/sda1 495844 56258 413986 12% /boot
[root@testdb2 ~]#
我原来的oracle软件和数据，都放在根目录的/u01下，现在根目录已经82%了。
我决定给vbox加一块盘，扩大根目录的空间。
首先，在vbox的图形化界面添加一块硬盘。
add-vdisk
当然，如果不用图形化界面，用命令行如下，也是可以的。
VBoxManage createhd --filename "Z:\Oralce_Virtual_Box\Test DB\TestDB2(11g 12c)\Test_db(11 12c)_AttachStorage.vdi" --size 8192 --format VDI --variant Standard
VBoxManage storageattach "TestDB2(11g 12c)" --storagectl "SATA" --port 2 --device 0 --type hdd --medium "Z:\Oralce_Virtual_Box\Test DB\TestDB2(11g 12c)\Test_db(11 12c)_AttachStorage.vdi"
完成后，打开linux，进行扩容。
## 初始状态
[root@testdb2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_testdb2-lv_root
27G 21G 4.5G 82% /
tmpfs 3.4G 88K 3.4G 1% /dev/shm
/dev/sda1 485M 55M 405M 12% /boot
[root@testdb2 ~]#
[root@testdb2 ~]#
[root@testdb2 ~]#
[root@testdb2 ~]# cd /dev
[root@testdb2 dev]# ls -l sd*
brw-rw----. 1 root disk 8, 0 Nov 3 09:29 sda
brw-rw----. 1 root disk 8, 1 Nov 3 09:30 sda1
brw-rw----. 1 root disk 8, 2 Nov 3 09:29 sda2
brw-rw----. 1 root disk 8, 16 Nov 3 09:29 sdb
可以看到，我新加的一块盘，叫sdb。
创建分区，注意类型选8e，即LVM管理。
[root@testdb2 dev]# fdisk /dev/sdb
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 <<<输入n
Command action
e extended
p primary partition (1-4)
p <<<输入p
Partition number (1-4): 1 <<<输入1
First cylinder (1-1044, default 1): <<<回车
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1044, default 1044): <<<回车
Using default value 1044
Command (m for help): t <<<输入t
Selected partition 1
Hex code (type L to list codes): L <<<输入L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx
5 Extended 42 SFS 86 NTFS volume set da Non-FS data
6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility
8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt
9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access
a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT
f W95 Ext"d (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary
16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT
1e Hidden W95 FAT1
Hex code (type L to list codes): 8e <<<输入8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help):
Command (m for help): p <<<输入p，进行查看，确认没有问题
Disk /dev/sdb: 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: 0x039b1264
Device Boot Start End Blocks Id System
/dev/sdb1 1 1044 8385898+ 8e Linux LVM
Command (m for help): w <<<输入w，写出到分区表。
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@testdb2 dev]#
[root@testdb2 dev]# ls -l sd*
brw-rw----. 1 root disk 8, 0 Nov 3 09:29 sda
brw-rw----. 1 root disk 8, 1 Nov 3 09:30 sda1
brw-rw----. 1 root disk 8, 2 Nov 3 09:29 sda2
brw-rw----. 1 root disk 8, 16 Nov 3 09:29 sdb
brw-rw----. 1 root disk 8, 17 Nov 3 09:30 sdb1
可以用fdisk -l检查一下，新建的sdb1分区，是lvm管理：
[root@testdb2 dev]# fdisk -l
Disk /dev/sda: 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: 0x000b1d34
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 3917 30944256 8e Linux LVM
Disk /dev/sdb: 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: 0x039b1264
Device Boot Start End Blocks Id System
/dev/sdb1 1 1044 8385898+ 8e Linux LVM <<<<新建的分区，lvm管理
Disk /dev/mapper/vg_testdb2-lv_root: 28.5 GB, 28538044416 bytes
255 heads, 63 sectors/track, 3469 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_testdb2-lv_swap: 3145 MB, 3145728000 bytes
255 heads, 63 sectors/track, 382 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
[root@testdb2 dev]#
然后，先创建pv：
[root@testdb2 dev]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@testdb2 dev]#
[root@testdb2 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_testdb2 <<< 可以看到原来已经存在的一个pv，注意记录此名字，一会要用到。
PV Size 29.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 7554
Free PE 0
Allocated PE 7554
PV UUID FM5QpS-QVVz-HzaR-yDky-xyp7-pnii-ZjeqsV
"/dev/sdb1" is a new physical volume of "8.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name <<< 新创建的pv，还没加入到vg，所以显示是空。一会加入。
PV Size 8.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID BvodFn-begg-Fd3I-J12E-LzBE-Z9I7-PqhcFO
[root@testdb2 ~]#
我们再来看看，pv之上，vg的情况：
[root@testdb2 ~]# vgdisplay
--- Volume group ---
VG Name vg_testdb2 <<<< 注意记录此名字，一会要用到。
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 29.51 GiB
PE Size 4.00 MiB
Total PE 7554
Alloc PE / Size 7554 / 29.51 GiB
Free PE / Size 0 / 0 <<<<<< 注意Free的大小，vgextend之前，Free为0
VG UUID VOCOIo-ldU1-riYX-tKUc-fbVz-AkYY-QovsFe
[root@testdb2 ~]#
我们进行vgextend：
[root@testdb2 ~]# vgextend vg_testdb2 /dev/sdb1
Volume group "vg_testdb2" successfully extended
[root@testdb2 ~]#
[root@testdb2 ~]# vgdisplay
--- Volume group ---
VG Name vg_testdb2
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 37.50 GiB
PE Size 4.00 MiB
Total PE 9601
Alloc PE / Size 7554 / 29.51 GiB
Free PE / Size 2047 / 8.00 GiB <<<<<<<<有变化了，Free有8G了。
VG UUID VOCOIo-ldU1-riYX-tKUc-fbVz-AkYY-QovsFe
[root@testdb2 ~]#
我们再来看看lv的情况：
[root@testdb2 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_testdb2/lv_root
LV Name lv_root
VG Name vg_testdb2
LV UUID GvdFtq-RLee-iuXW-SZEw-XZsh-MHv3-yXf5Um
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2013-12-09 10:46:23 +0800
LV Status available
# open 1
LV Size 26.58 GiB
Current LE 6804
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Path /dev/vg_testdb2/lv_swap
LV Name lv_swap
VG Name vg_testdb2
LV UUID AxCkee-CZEx-pAPl-NDWN-h0VY-erfC-KISgl7
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2013-12-09 10:46:26 +0800
LV Status available
# open 2
LV Size 2.93 GiB
Current LE 750
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
[root@testdb2 ~]#
进行lvextend，注意大小稍微比原来的8G小一些：
[root@testdb2 ~]# lvextend -L +7.9G /dev/vg_testdb2/lv_root
Rounding size to boundary between physical extents: 7.90 GiB
Extending logical volume lv_root to 34.48 GiB
Logical volume lv_root successfully resized
[root@testdb2 ~]#
注意，lvextend之后，我们看文件系统，还是没有扩容的，因为还需要进行resize2fs命令：
[root@testdb2 ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_testdb2-lv_root
27431124 21329720 4707948 82% /
tmpfs 3481600 88 3481512 1% /dev/shm
/dev/sda1 495844 56258 413986 12% /boot
[root@testdb2 ~]#
resize2fs命令：
[root@testdb2 ~]# resize2fs /dev/vg_testdb2/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_testdb2/lv_root is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/vg_testdb2/lv_root to 9038848 (4k) blocks.
The filesystem on /dev/vg_testdb2/lv_root is now 9038848 blocks long.
[root@testdb2 ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_testdb2-lv_root
35587744 21333800 12448736 64% /
tmpfs 3481600 88 3481512 1% /dev/shm
/dev/sda1 495844 56258 413986 12% /boot
[root@testdb2 ~]#
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