一个数据中心机器连接了 6 个磁盘，如下所示
# pvscan
pvscan -- ACTIVE PV "/dev/sda" of VG "dev" [1.95 GB / 0 free]
pvscan -- ACTIVE PV "/dev/sdb" of VG "sales" [1.95 GB / 0 free]
pvscan -- ACTIVE PV "/dev/sdc" of VG "ops" [1.95 GB / 44 MB free]
pvscan -- ACTIVE PV "/dev/sdd" of VG "dev" [1.95 GB / 0 free]
pvscan -- ACTIVE PV "/dev/sde1" of VG "ops" [996 MB / 52 MB free]
pvscan -- ACTIVE PV "/dev/sde2" of VG "sales" [996 MB / 944 MB free]
pvscan -- ACTIVE PV "/dev/sdf1" of VG "ops" [996 MB / 0 free]
pvscan -- ACTIVE PV "/dev/sdf2" of VG "dev" [996 MB / 72 MB free]
pvscan -- total: 8 [11.72 GB] / in use: 8 [11.72 GB] / in no VG: 0 [0]
# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/dev/cvs 1342492 516468 757828 41% /mnt/dev/cvs
/dev/dev/users 2064208 2060036 4172 100% /mnt/dev/users
/dev/dev/build 1548144 1023041 525103 66% /mnt/dev/build
/dev/ops/databases 2890692 2302417 588275 79% /mnt/ops/databases
/dev/sales/users 2064208 871214 1192994 42% /mnt/sales/users
/dev/ops/batch 1032088 897122 134966 86% /mnt/ops/batch
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新磁盘将在 ops 和 dev 之间平均分配，因此将其分区为两个物理卷 /dev/sdg1 和 /dev/sdg2
# fdisk /dev/sdg
Device contains neither a valid DOS partition table, nor Sun or SGI
disklabel Building a new DOS disklabel. Changes will remain in memory
only, until you decide to write them. After that, of course, the
previous content won't be recoverable.
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1000, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1000, default 1000): 500
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (501-1000, default 501):
Using default value 501
Last cylinder or +size or +sizeM or +sizeK (501-1000, default 1000):
Using default value 1000
Command (m for help): t
Partition number (1-4): 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Unknown)
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 (Unknown)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: If you have created or modified any DOS 6.x partitions,
please see the fdisk manual page for additional information.
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接下来在此分区上创建物理卷
# pvcreate /dev/sdg1
pvcreate -- physical volume "/dev/sdg1" successfully created
# pvcreate /dev/sdg2
pvcreate -- physical volume "/dev/sdg2" successfully created
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然后将卷添加到 dev 和 ops 卷组
# vgextend ops /dev/sdg1
vgextend -- INFO: maximum logical volume size is 255.99 Gigabyte
vgextend -- doing automatic backup of volume group "ops"
vgextend -- volume group "ops" successfully extended
# vgextend dev /dev/sdg2
vgextend -- INFO: maximum logical volume size is 255.99 Gigabyte
vgextend -- doing automatic backup of volume group "dev"
vgextend -- volume group "dev" successfully extended
# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE PV "/dev/sda" of VG "dev" [1.95 GB / 0 free]
pvscan -- ACTIVE PV "/dev/sdb" of VG "sales" [1.95 GB / 0 free]
pvscan -- ACTIVE PV "/dev/sdc" of VG "ops" [1.95 GB / 44 MB free]
pvscan -- ACTIVE PV "/dev/sdd" of VG "dev" [1.95 GB / 0 free]
pvscan -- ACTIVE PV "/dev/sde1" of VG "ops" [996 MB / 52 MB free]
pvscan -- ACTIVE PV "/dev/sde2" of VG "sales" [996 MB / 944 MB free]
pvscan -- ACTIVE PV "/dev/sdf1" of VG "ops" [996 MB / 0 free]
pvscan -- ACTIVE PV "/dev/sdf2" of VG "dev" [996 MB / 72 MB free]
pvscan -- ACTIVE PV "/dev/sdg1" of VG "ops" [996 MB / 996 MB free]
pvscan -- ACTIVE PV "/dev/sdg2" of VG "dev" [996 MB / 996 MB free]
pvscan -- total: 10 [13.67 GB] / in use: 10 [13.67 GB] / in no VG: 0 [0]
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接下来要做的是扩展文件系统，以便用户可以使用额外的空间。
有一些工具允许在线调整 ext2 文件系统的大小，但在这里我们采取安全的方式，并在调整大小之前卸载这两个文件系统
# umount /mnt/ops/batch
# umount /mnt/dev/users
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然后我们使用 e2fsadm 命令在一个操作中调整逻辑卷和 ext2 文件系统的大小。我们使用 ext2resize 而不是 resize2fs（它是 e2fsadm 的默认命令），因此我们定义环境变量 E2FSADM_RESIZE_CMD 来告诉 e2fsadm 使用该命令。
# export E2FSADM_RESIZE_CMD=ext2resize
# e2fsadm /dev/ops/batch -L+500M
e2fsck 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/ops/batch: 11/131072 files (0.0<!-- non-contiguous), 4127/262144 blocks
lvextend -- extending logical volume "/dev/ops/batch" to 1.49 GB
lvextend -- doing automatic backup of volume group "ops"
lvextend -- logical volume "/dev/ops/batch" successfully extended
ext2resize v1.1.15 - 2000/08/08 for EXT2FS 0.5b
e2fsadm -- ext2fs in logical volume "/dev/ops/batch" successfully extended to 1.49 GB
# e2fsadm /dev/dev/users -L+900M
e2fsck 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/dev/users: 12/262144 files (0.0% non-contiguous), 275245/524288 blocks
lvextend -- extending logical volume "/dev/dev/users" to 2.88 GB
lvextend -- doing automatic backup of volume group "dev"
lvextend -- logical volume "/dev/dev/users" successfully extended
ext2resize v1.1.15 - 2000/08/08 for EXT2FS 0.5b
e2fsadm -- ext2fs in logical volume "/dev/dev/users" successfully extended to 2.88 GB
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我们现在可以重新挂载文件系统，并看到有足够的空间。
# mount /dev/ops/batch
# mount /dev/dev/users
# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/dev/cvs 1342492 516468 757828 41% /mnt/dev/cvs
/dev/dev/users 2969360 2060036 909324 69% /mnt/dev/users
/dev/dev/build 1548144 1023041 525103 66% /mnt/dev/build
/dev/ops/databases 2890692 2302417 588275 79% /mnt/ops/databases
/dev/sales/users 2064208 871214 1192994 42% /mnt/sales/users
/dev/ops/batch 1535856 897122 638734 58% /mnt/ops/batch
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