Linux系统中对逻辑卷(LVM)的实现

Linux系统中对逻辑卷(LVM)的实现

1.分区并转换lvm格式
[root@localhost ~]# fdisk -cu /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xd8e8fb90.
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)
Command (m for help): n
Command action
e  extended
p  primary partition (1-4)
p
Partition number (1-4): 1
First sector (2048-4485119, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-4485119, default 4485119): +200M
Command (m for help): n
Command action
e  extended
p  primary partition (1-4)
p
Partition number (1-4): 2
First sector (411648-4485119, default 411648):
Using default value 411648
Last sector, +sectors or +size{K,M,G} (411648-4485119, default 4485119): +200M
Command (m for help): n
Command action
e  extended
p  primary partition (1-4)
p
Partition number (1-4): 3
First sector (821248-4485119, default 821248):
Using default value 821248
Last sector, +sectors or +size{K,M,G} (821248-4485119, default 4485119): +200M
Command (m for help): n
Command action
e  extended
p  primary partition (1-4)
p
Selected partition 4
First sector (1230848-4485119, default 1230848):
Using default value 1230848
Last sector, +sectors or +size{K,M,G} (1230848-4485119, default 4485119): +200M
Command (m for help): p
Disk /dev/sdb: 2296 MB, 2296381440 bytes
255 heads, 63 sectors/track, 279 cylinders, total 4485120 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 identifier: 0xd8e8fb90
Device Boot      Start        End      Blocks  Id  System
/dev/sdb1            2048      411647      204800  83  Linux
/dev/sdb2          411648      821247      204800  83  Linux
/dev/sdb3          821248    1230847      204800  83  Linux
/dev/sdb4        1230848    1640447      204800  83  Linux
Command (m for help): t
Partition number (1-4): 1
Hex code (type L to list codes): 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
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 8e
Changed system type of partition 2 to 8e (Linux LVM)
Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)
Command (m for help): t
Partition number (1-4): 4
Hex code (type L to list codes): 8e
Changed system type of partition 4 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sdb: 2296 MB, 2296381440 bytes
255 heads, 63 sectors/track, 279 cylinders, total 4485120 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 identifier: 0xd8e8fb90
Device Boot      Start        End      Blocks  Id  System
/dev/sdb1            2048      411647      204800  8e  Linux LVM
/dev/sdb2          411648      821247      204800  8e  Linux LVM
/dev/sdb3          821248    1230847      204800  8e  Linux LVM
/dev/sdb4        1230848    1640447      204800  8e  Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]#

2.将分区转换为pv物理卷,将pv加入到一个vg组中,从vg划出lv逻辑卷
[root@localhost ~]# pvcreate /dev/sdb{1,2,3,4}    --将分区转换为物理卷
Physical volume "/dev/sdb1" successfully created
Physical volume "/dev/sdb2" successfully created
Physical volume "/dev/sdb3" successfully created
Physical volume "/dev/sdb4" successfully created
[root@localhost ~]# pvscan    --查看物理卷
PV /dev/sda2  VG VolGroup        lvm2 [7.51 GiB / 0    free]
PV /dev/sdb1                      lvm2 [200.00 MiB]
PV /dev/sdb2                      lvm2 [200.00 MiB]
PV /dev/sdb3                      lvm2 [200.00 MiB]
PV /dev/sdb4                      lvm2 [200.00 MiB]
Total: 5 [8.29 GiB] / in use: 1 [7.51 GiB] / in no VG: 4 [800.00 MiB]
[root@localhost ~]# vgcreate vg0 /dev/sdb{1,2,3}    --将物理卷1,2,3加入到卷组
Volume group "vg0" successfully created
[root@localhost ~]# vgscan    --查看卷组
Reading all physical volumes.  This may take a while...
Found volume group "vg0" using metadata type lvm2
Found volume group "VolGroup" using metadata type lvm2
[root@localhost ~]# lvcreate -n test -L 150M vg0    --从卷组中分出pv逻辑卷
Rounding up size to full physical extent 152.00 MiB
Logical volume "test" created
[root@localhost ~]# lvcreate -n test1 -L 150M vg0
Rounding up size to full physical extent 152.00 MiB
Logical volume "test1" created
[root@localhost ~]# lvscan
ACTIVE            '/dev/vg0/test' [152.00 MiB] inherit
ACTIVE            '/dev/vg0/test1' [152.00 MiB] inherit
ACTIVE            '/dev/VolGroup/lv_root' [6.51 GiB] inherit
ACTIVE            '/dev/VolGroup/lv_swap' [1.00 GiB] inherit
[root@localhost ~]# mkfs.ext4 /dev/vg0/test    --格式化物理卷
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
38912 inodes, 155648 blocks
7782 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
19 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@localhost ~]# mount /dev/vg0/test /mnt/sdb  --挂载
[root@localhost ~]# mkdir /mnt/sdb/12        --可以使用了
[root@localhost ~]# ll /mnt/sdb/
total 14
drwxr-xr-x. 2 root root  1024 Jan  9 15:24 12
drwx------. 2 root root 12288 Jan  9 15:23 lost+found
[root@localhost ~]#

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