Linux 建立 LVM 磁碟方式

目標

要將 /dev/sdb 建立成一個 LVM 磁碟

可以使用 fdisk -l 列出目前主機內的所有實體硬碟資料清單

1 fdisk

fdisk /dev/sdb

:
Command (m for help): n
:
   p   primary partition (1-4) p
Partition number (1-4): 1
First cylinder (1-24321, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-24321, default 24321):
Using default value 24321

Command (m for help): t
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
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

2 pvcreate/vgcreate

pvcreate /dev/sdb1
vgcreate vg-seagate1 /dev/sdb1
vgdisplay vg-seagate1

  --- Volume group ---
  VG Name               vg-seagate1
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               298.09 GB
  PE Size               4.00 MB
  Total PE              76310
  Alloc PE / Size       0 / 0
  Free  PE / Size       76310 / 298.09 GB
  VG UUID               XrrB58-E5zC-OFg0-e3Ch-lNsj-wr0n-LiyH33

3 create, format, and mount logical volume

指定特定空間大小 290G
- lvcreate -L 290G -ndata01 vg-seagate1
- mkfs -t ext3 /dev/vg-seagate1/data01
- mount /dev/vg-seagate1/data01 /backup
由上面 vgdisplay 可以知道 vg-seagate1 的可用大小為 VG Size = 298.09 GB 如果想要擴增到 100% 可透過 lvextend 來加上剩下的 8.08G¹⁾
- lvextend -L +8.08G /dev/vg-seagate1/data01
- ext2online /dev/vg-seagate1/data01

看執行的內容

[root@ibm-x206 ~]# lvextend -L +8.09G /dev/vg-seagate1/data01
  Rounding up size to full physical extent 8.09 GB
  Extending logical volume data01 to 298.09 GB
  Insufficient free space: 2072 extents needed, but only 2070 available

[root@ibm-x206 ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg-seagate1/data01
  VG Name                vg-seagate1
  LV UUID                1nFltd-kgtz-v8od-k1LK-y717-pOlp-piBcrE
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                290.00 GB
  Current LE             74240
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:2

[root@ibm-x206 ~]# lvextend -L +8.08G /dev/vg-seagate1/data01
  Rounding up size to full physical extent 8.08 GB
  Extending logical volume data01 to 298.08 GB
  Logical volume data01 successfully resized

[root@ibm-x206 ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg-seagate1/data01
  VG Name                vg-seagate1
  LV UUID                1nFltd-kgtz-v8od-k1LK-y717-pOlp-piBcrE
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                298.08 GB
  Current LE             76309
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:2

[root@ibm-x206 backup]# df -k
Filesystem             1K-區段      已用     可用 已用% 掛載點
/dev/mapper/VolGroup00-LogVol00
                     305346824   1237084 288599008   1% /
/dev/sda1               101086     19636     76231  21% /boot
none                    517016         0    517016   0% /dev/shm
/dev/mapper/vg--seagate1-data01
                     299315840     98368 284013120   1% /backup

[root@ibm-x206 backup]# ext2online /dev/vg-seagate1/data01
ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b
[root@ibm-x206 backup]# df -k
Filesystem             1K-區段      已用     可用 已用% 掛載點
/dev/mapper/VolGroup00-LogVol00
                     305346824   1237084 288599008   1% /
/dev/sda1               101086     19636     76231  21% /boot
none                    517016         0    517016   0% /dev/shm
/dev/mapper/vg--seagate1-data01
                     307656824     98368 291930476   1% /backup

如果有安裝 X Window 又在 Console 前面也可使用 system-config-lvm 的圖形介面來建立

參考網址

Linux, 磁碟儲存

¹⁾ 8.09G 會出現空間不足的問題

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tech/lvm.txt · 上一次變更: 2008/01/08 06:34 來自 jonathan

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