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我的博客已迁移到xdoujiang.com请去那边和我交流
基础环境
1、当前版本
cat
/etc/debian_version
7.8
2、安装包lvm2
apt-get
install
lvm2 -y
一、将sdb sdc sdd三块分区加到卷组(hadoop),并创建5G的逻辑卷(hadoop1),PE默认
1、使用pvcreate命令将sdb sdc sdd分区创建成物理卷(pvcreate - initialize a disk or partition
for
use by LVM)
pvcreate
/dev/sdb
/dev/sdc
/dev/sdd
Writing physical volume data to disk
"/dev/sdb"
Physical volume
"/dev/sdb"
successfully created
Writing physical volume data to disk
"/dev/sdc"
Physical volume
"/dev/sdc"
successfully created
Writing physical volume data to disk
"/dev/sdd"
Physical volume
"/dev/sdd"
successfully created
EXAMPLES
Initialize partition
#4 on the third SCSI disk and the entire fifth SCSI disk for later use by LVM:
pvcreate
/dev/sdc4
/dev/sde
2、使用pvs或pvdisplay命令查看
1)pvs(pvs - report information about physical volumes)
PV VG Fmt Attr PSize PFree
/dev/sdb
lvm2 a-- 10.00g 10.00g
/dev/sdc
lvm2 a-- 10.00g 10.00g
/dev/sdd
lvm2 a-- 10.00g 10.00g
2)pvdisplay(pvdisplay - display attributes of a physical volume)
"/dev/sdb"
is a new physical volume of
"10.00 GiB"
--- NEW Physical volume ---
PV Name
/dev/sdb
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID OkVC5O-SWOq-daXZ-BrNy-Hy83-G9Sm-d8bMT4
"/dev/sdc"
is a new physical volume of
"10.00 GiB"
--- NEW Physical volume ---
PV Name
/dev/sdc
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 7vg9eM-pIRR-Ahi0-BNvn-A1pr-WQa0-hvdC9X
"/dev/sdd"
is a new physical volume of
"10.00 GiB"
--- NEW Physical volume ---
PV Name
/dev/sdd
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID MyPYTC-Vk4P-ltjL-SX6w-jK3V-422c-HACxOK
3、使用vgcreate命令创建hadoop卷组并将sdb sdc sdd加入到卷组里(vgcreate - create a volume group)
vgcreate hadoop
/dev/sdb
/dev/sdc
/dev/sdd
Volume group
"hadoop"
successfully created
这里使用默认的PE 4MB
EXAMPLES
To create a volume group named test_vg using physical volumes
/dev/sdk1
, and
/dev/sdl1
with default physical extent size of 4MB:
vgcreate test_vg
/dev/sdk1
/dev/sdl1
4、使用vgs或vgdisplay命令查看
1)vgs(vgs - report information about volume
groups
)
VG
#PV #LV #SN Attr VSize VFree
hadoop 3 0 0 wz--n- 29.99g 29.99g
2)vgdisplay(vgdisplay - display attributes of volume
groups
)
--- Volume group ---
VG Name hadoop
System ID
Format lvm2
Metadata Areas 3
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 3
Act PV 3
VG Size 29.99 GiB
PE Size 4.00 MiB
Total PE 7677
Alloc PE / Size 0 / 0
Free PE / Size 7677 / 29.99 GiB
VG UUID 9BpObQ-0qNt-7MRM-cJ4Y-aMyE-5ZEd-GoSi9N
5、使用lvcreate命令创建逻辑卷为hadoop1 大小是5G(lvcreate creates a new logical volume
in
a volume group)
lvcreate -L 5G -n hadoop1 hadoop
Logical volume
"hadoop1"
created
-L, --size LogicalVolumeSize[bBsSkKmMgGtTpPeE]
Gives the size to allocate
for
the new logical volume.A size suffix of K
for
kilobytes,M
for
megabytes,
G
for
gigabytes,T
for
terabytes,P
for
petabytes or E
for
exabytes is optional.Default unit is megabytes.
6、使用lvs或lvdisplay命令查看
1)lvs(lvs - report information about logical volumes)
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
hadoop1 hadoop -wi-a--- 5.00g
2)lvdisplay(lvdisplay - display attributes of a logical volume)
--- Logical volume ---
LV Path
/dev/hadoop/hadoop1
LV Name hadoop1
VG Name hadoop
LV UUID y8CHyc-G7du-h9jZ-XV4T-dvZC-bzv1-NdsbS0
LV Write Access
read
/write
LV Creation host,
time
debian, 2015-06-12 23:51:09 -0400
LV Status available
# open 0
LV Size 5.00 GiB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors auto
- currently
set
to 256
Block device 254:0
7、将
/dev/hadoop/hadoop1
格式化成ext4
mkfs.ext4
/dev/hadoop/hadoop1
8、写进
/etc/fatab
中并挂载
/dev/mapper/hadoop-hadoop1
/hadoop
ext4 defaults 0 0
mount
-a
9、查看是否挂载成功
df
-Th
Filesystem Type Size Used Avail Use% Mounted on
rootfs rootfs 9.2G 1.7G 7.1G 19% /
udev devtmpfs 10M 0 10M 0%
/dev
tmpfs tmpfs 99M 256K 99M 1%
/run
/dev/disk/by-uuid/f730250f-21de-45dd-a3e7-6c5d74508f4b
ext4 9.2G 1.7G 7.1G 19% /
tmpfs tmpfs 5.0M 0 5.0M 0%
/run/lock
tmpfs tmpfs 961M 0 961M 0%
/run/shm
/dev/sda5
ext4 17G 180M 16G 2%
/opt
/dev/mapper/hadoop-hadoop1
ext4 5.0G 138M 4.6G 3%
/hadoop
二、将
/dev/mapper/hadoop-hadoop1
逻辑卷夸大到40G并挂载
1、使用pvcreate命令将sde分区创建成物理卷
pvcreate
/dev/sde
Writing physical volume data to disk
"/dev/sde"
Physical volume
"/dev/sde"
successfully created
2、使用vgextend命令将sde加入到卷组hadoop(vgextend - add physical volumes to a volume group)
vgextend hadoop
/dev/sde
Volume group
"hadoop"
successfully extended
Examples
vgextend vg00
/dev/sda4
/dev/sdn1
tries to extend the existing volume group vg00
by the new physical volumes (see pvcreate(8))
/dev/sdn1
and
/dev/sda4
.
3、先查看下卷组有多少PE
vgdisplay
--- Volume group ---
VG Name hadoop
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 8
VG Access
read
/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 4
Act PV 4
VG Size 39.98 GiB
PE Size 4.00 MiB
Total PE 10236
Alloc PE / Size 8956 / 34.98 GiB
Free PE / Size 1280 / 5.00 GiB
VG UUID 9BpObQ-0qNt-7MRM-cJ4Y-aMyE-5ZEd-GoSi9N
一共有10236个PE
4、使用lvextend命令将现有逻辑卷为hadoop1增大到40G(lvextend - extend the size of a logical volume)
lvextend -l 10236
/dev/hadoop/hadoop1
Extending logical volume hadoop1 to 39.98 GiB
Logical volume hadoop1 successfully resized
-l, --extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}]
Extend or
set
the logical volume size
in
units
of logical extents.
5、使用resize2fs命令扩大文件系统(resize2fs - ext2
/ext3/ext4
file
system resizer)
resize2fs
/dev/hadoop/hadoop1
resize2fs 1.42.5 (29-Jul-2012)
Filesystem at
/dev/hadoop/hadoop1
is mounted on
/hadoop
; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 3
Performing an on-line resize of
/dev/hadoop/hadoop1
to 10481664 (4k) blocks.
The filesystem on
/dev/hadoop/hadoop1
is now 10481664 blocks long.
6、最后检查下是否扩大到40G了
df
-Th
Filesystem Type Size Used Avail Use% Mounted on
rootfs rootfs 9.2G 1.7G 7.1G 19% /
udev devtmpfs 10M 0 10M 0%
/dev
tmpfs tmpfs 99M 260K 99M 1%
/run
/dev/disk/by-uuid/f730250f-21de-45dd-a3e7-6c5d74508f4b
ext4 9.2G 1.7G 7.1G 19% /
tmpfs tmpfs 5.0M 0 5.0M 0%
/run/lock
tmpfs tmpfs 961M 0 961M 0%
/run/shm
/dev/sda5
ext4 17G 180M 16G 2%
/opt
/dev/mapper/hadoop-hadoop1
ext4 40G 143M 38G 1%
/hadoop
三、参考文章
https:
//wiki
.archlinux.org
/index
.php
/LVM_
%28%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87%29
|
本文转自 xdoujiang 51CTO博客，原文链接：http://blog.51cto.com/7938217/1661595，如需转载请自行联系原作者
