二、 配置 LVM ;
要配置 LVM ,可以按以下步骤进行:
1. 创建和初始化物理卷( Physical Volume ),通过 pvcreate 建立 pv ,即 pv 阶段;
2. 添加物理卷到卷组( Volume Group ),使用 vgcreate 加入多个 pv 成为 vg ,即 vg 阶段;
3. 在卷组上创建逻辑卷( logical volume ),使用 lvcreate 划分 vg, 成为一个或多个 lv, 即 lv 阶段;
# pvcreate /dev/md0 # 创建 PV
Physical volume "/dev/md0" successfully created
# pvscan
PV /dev/md0 VG LVM1 lvm2 [1.82 TB / 1.82 GB free]
Total: 1 [1.82 TB] / in use: 1 [1.82 TB] / in no VG: 0 [0 ]
# vgcreate LVM1 /dev/md0 # 创建 VG
Volume group "LVM1" successfully created
# vgdisplay LVM1
--- Volume group ---
VG Name LVM1
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 1.82 TB
PE Size 4.00 MB
Total PE 476933
Alloc PE / Size 0 / 0
Free PE / Size 476933 / 1.82 TB
VG UUID 97Fecv-lBFP-oB19-dfrF-wJ7y-9KJ9-9sIKYG
# lvcreate -L 1.5TB -n data1 LVM1 # 创建 LV
/dev/cdrom: open failed: Read-only file system
Logical volume "data1" created
# lvcreate -L 325GB -n data2 LVM1 # 创建 LV
/dev/cdrom: open failed: Read-only file system
Logical volume "data2" created
# lvscan # 查看 LV 信息
ACTIVE '/dev/LVM1/data1' [1.50 TB] inherit
ACTIVE '/dev/LVM1/data2' [325.00 GB] inherit
# pvscan # 再次查看 PV 信息
PV /dev/md0 VG LVM1 lvm2 [1.82 TB / 2.02 GB free]
Total: 1 [1.82 TB] / in use: 1 [1.82 TB] / in no VG: 0 [0 ]
# vgdisplay LVM1 # 再次查看 VG 信息
--- Volume group ---
VG Name LVM1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
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 1.82 TB
PE Size 4.00 MB
Total PE 476933
Alloc PE / Size 476416 / 1.82 TB
Free PE / Size 517 / 2.02 GB
VG UUID 97Fecv-lBFP-oB19-dfrF-wJ7y-9KJ9-9sIKYG
CentOS 5.2+Raid 0+LVM+ISCSI配置详解(2)
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