[root@xyly ~]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 *11310439183 Linux
/dev/sda2 14128810241437+ 83 Linux
/dev/sda3 128919255116702+ 83 Linux
/dev/sda4 19265221264751205 Extended
/dev/sda5 19262056105222682 Linux swap / Solaris
/dev/sda6 205752212542283183 Linux
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 113051048238183 Linux
Disk /dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
以上是我格式化好的2个 /dev/sdb1 和 /dev/sdbc1.
2，把分区转成物理卷pv
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[root@xyly ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@xyly ~]# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created
[root@xyly ~]# pvdisplay--- Physical volume ---
PV Name /dev/sdb1
VG Name nyvg1
PV Size 10.00 GB / not usable 717.00 KB
Allocatable yes
PE Size (KByte)4096
Total PE 2559
Free PE 2506
Allocated PE 53
PV UUID W23uI8-kZ46-4W3y-L0tW-Za22-nMeG-YbLeoD
--- Physical volume ---
PV Name /dev/sdc1
VG Name nyvg1
PV Size 10.00 GB / not usable 717.00 KB
Allocatable yes
PE Size (KByte)4096
Total PE 2559
Free PE 2521
Allocated PE 38
PV UUID Mzv5fV-xret-4IyG-s2fC-py33-mvCW-iBVF0Z
[root@xyly ~]#[root@xyly ~]# vgcreate lvm001 /dev/sd[bc]1 #讲/dev/sdb1 和/dev/sdbc1 加入到卷组lvm001 中/dev/cdrom: open failed: Read-only file system
Volume group "lvm001" successfully created
[root@xyly ~]# vgdisplay #使用vgdisplay 查看卷组--- Volume group ---
VG Name lvm001
System ID
Format lvm2
Metadata Areas 2
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 2
Act PV 2
VG Size 19.99 GB
PE Size 4.00 MB #默认的PE大小为4M
Total PE 5118
Alloc PE / Size 0/0
Free PE / Size 5118/19.99 GB #一共5118个pe，未使用的。
VG UUID oKhjBB-L9At-I2KC-Zrd3-fR2g-QoTe-3x0AST
[root@xyly ~]# lvcreate -L 100M -s -n test1_snap /dev/lvm001/test1 #-L表示快照的大小。-s 表示创建快照 -n 是快照的名字
Logical volume "test1_snap" created
[root@xyly ~]# lvscan
ACTIVE Original &＃39;/dev/lvm001/test1&＃39;[1000.00 MB] inherit
ACTIVE &＃39;/dev/lvm001/test2&＃39;[1000.00 MB] inherit
ACTIVE Snapshot &＃39;/dev/lvm001/test1_snap&＃39;[100.00 MB] inherit
[root@xyly ~]# lvdisplay /dev/lvm001/test1*--- Logical volume ---
LV Name /dev/lvm001/test1
VG Name lvm001
LV UUID ZiqMqR-XqD6-tNuv-dnv1-6a1C-PN0n-ZmRP2T
LV Write Access read/write
LV snapshot status source of #lvm快照源/dev/lvm001/test1_snap [active]
LV Status available
# open 1
LV Size 1000.00 MB #lvm 大小
Current LE 250
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0--- Logical volume ---
LV Name /dev/lvm001/test1_snap
VG Name lvm001
LV UUID 9mapX2-7OD2-emXG-rG37-XLj5-hcAl-DmanQv
LV Write Access read/write#是否可写
LV snapshot status active destination for/dev/lvm001/test1 #处于活动状态，镜像的路径
LV Status available
# open 0
LV Size
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