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#查看新增加的磁盘
[root@centos002 ~]
# fdisk -l
Disk
/dev/sda
: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors
/track
, 2610 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: 0x000c8b4b
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 2611 20458496 8e Linux LVM
Disk
/dev/sdb
: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors
/track
, 1305 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
#新建分区
[root@centos002 ~]
# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x3ec1c9a6.
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)
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
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1305, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305):
Using default value 1305
Command (m
for
help): w
The partition table has been altered!
Calling ioctl() to re-
read
partition table.
Syncing disks.
#格式化分区
[root@centos002 ~]
# mkfs.ext4 /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS
type
: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
655360 inodes, 2620595 blocks
131029 blocks (5.00%) reserved
for
the super user
First data block=0
Maximum filesystem blocks=2684354560
80 block
groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Writing inode tables:
done
Creating journal (32768 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.
#将新建分区更改为支持LVM格式
[root@centos002 ~]
# 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): p
Disk
/dev/sdb
: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors
/track
, 1305 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: 0x3ec1c9a6
Device Boot Start End Blocks Id System
/dev/sdb1
1 1305 10482381 83 Linux
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.
#查看更改后的分区格式
[root@centos002 ~]
# fdisk -l
Disk
/dev/sda
: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors
/track
, 2610 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: 0x000c8b4b
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 2611 20458496 8e Linux LVM
Disk
/dev/sdb
: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors
/track
, 1305 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: 0x3ec1c9a6
Device Boot Start End Blocks Id System
/dev/sdb1
1 1305 10482381 8e Linux LVM
##查看VG
[root@centos002 ~]
# vgdisplay
--- Volume group ---
VG Name vg_centos002
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 19.51 GiB
PE Size 4.00 MiB
Total PE 4994
Alloc PE / Size 4994 / 19.51 GiB
Free PE / Size 0 / 0
VG UUID ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O
#创建PV与查看
[root@centos002 ~]
# pvcreate /dev/sdb1
Physical volume
"/dev/sdb1"
successfully created
[root@centos002 ~]
# pvdisplay
--- Physical volume ---
PV Name
/dev/sda2
VG Name vg_centos002
PV Size 19.51 GiB / not usable 3.00 MiB
Allocatable
yes
(but full)
PE Size 4.00 MiB
Total PE 4994
Free PE 0
Allocated PE 4994
PV UUID Z7AOVb-LEzI-su15-J5lC-alj8-a94k-1NmRRv
"/dev/sdb1"
is a new physical volume of
"10.00 GiB"
--- NEW Physical volume ---
PV Name
/dev/sdb1
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 4N37pw-Q59f-FRZE-glEx-lRWh-BY5O-Zk9JrF
#查看LV
[root@centos002 ~]
# lvdisplay
--- Logical volume ---
LV Path
/dev/vg_centos002/lv_root
LV Name lv_root
VG Name vg_centos002
LV UUID 2G4f2m-gkIR-xXG0-MCfO-jFO2-jYNC-IBKYqL
LV Write Access
read
/write
LV Creation host,
time
centos002, 2017-08-21 13:15:29 +0800
LV Status available
# open 1
LV Size 17.57 GiB
Current LE 4498
Segments 1
Allocation inherit
Read ahead sectors auto
- currently
set
to 256
Block device 253:0
--- Logical volume ---
LV Path
/dev/vg_centos002/lv_swap
LV Name lv_swap
VG Name vg_centos002
LV UUID ITJYHF-bGpM-z314-lW1B-q8gj-8tgl-8NZ4bM
LV Write Access
read
/write
LV Creation host,
time
centos002, 2017-08-21 13:15:34 +0800
LV Status available
# open 1
LV Size 1.94 GiB
Current LE 496
Segments 1
Allocation inherit
Read ahead sectors auto
- currently
set
to 256
Block device 253:1
#LVM扩容
[root@centos002 ~]
# vgextend vg_centos002 /dev/sdb1
Volume group
"vg_centos002"
successfully extended
[root@centos002 ~]
# vgdisplay
--- Volume group ---
VG Name vg_centos002
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 29.50 GiB
PE Size 4.00 MiB
Total PE 7552
Alloc PE / Size 4994 / 19.51 GiB
Free PE / Size 2558 / 9.99 GiB
VG UUID ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O
#此时查看磁盘大小并没有增加
[root@centos002 ~]
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos002-lv_root
18G 803M 16G 5% /
tmpfs 238M 0 238M 0%
/dev/shm
/dev/sda1
477M 28M 425M 7%
/boot
#扩展LVM分区大小
[root@centos002 ~]
# lvextend -L 28G /dev/vg_centos002/lv_root
Insufficient
free
space: 2670 extents needed, but only 2558 available
#报错说明扩容的空间不足，需要调整值
[root@centos002 ~]
# lvextend -L 27G /dev/vg_centos002/lv_root
Size of logical volume vg_centos002
/lv_root
changed from 17.57 GiB (4498 extents) to 27.00 GiB (6912 extents).
Logical volume lv_root successfully resized.
[root@centos002 ~]
# lvdisplay
--- Logical volume ---
LV Path
/dev/vg_centos002/lv_root
LV Name lv_root
VG Name vg_centos002
LV UUID 2G4f2m-gkIR-xXG0-MCfO-jFO2-jYNC-IBKYqL
LV Write Access
read
/write
LV Creation host,
time
centos002, 2017-08-21 13:15:29 +0800
LV Status available
# open 1
LV Size 27.00 GiB
Current LE 6912
Segments 2
Allocation inherit
Read ahead sectors auto
- currently
set
to 256
Block device 253:0
--- Logical volume ---
LV Path
/dev/vg_centos002/lv_swap
LV Name lv_swap
VG Name vg_centos002
LV UUID ITJYHF-bGpM-z314-lW1B-q8gj-8tgl-8NZ4bM
LV Write Access
read
/write
LV Creation host,
time
centos002, 2017-08-21 13:15:34 +0800
LV Status available
# open 1
LV Size 1.94 GiB
Current LE 496
Segments 1
Allocation inherit
Read ahead sectors auto
- currently
set
to 256
Block device 253:1
#再次查看磁盘大小还是没有增加
[root@centos002 ~]
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos002-lv_root
18G 803M 16G 5% /
tmpfs 238M 0 238M 0%
/dev/shm
/dev/sda1
477M 28M 425M 7%
/boot
#重设根分区大小
[root@centos002 ~]
# resize2fs /dev/vg_centos002/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at
/dev/vg_centos002/lv_root
is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 2
Performing an on-line resize of
/dev/vg_centos002/lv_root
to 7077888 (4k) blocks.
The filesystem on
/dev/vg_centos002/lv_root
is now 7077888 blocks long.
#重新查看根分区大小
[root@centos002 ~]
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos002-lv_root
27G 803M 25G 4% /
tmpfs 238M 0 238M 0%
/dev/shm
/dev/sda1
477M 28M 425M 7%
/boot
|
本文转自 民工哥 51CTO博客，原文链接:http://blog.51cto.com/mingongge/1981144
