fdisk -l 命令
的输出:
- Disk /dev/sda: 120.0 GB, 120034123776 bytes
- 255 heads, 63 sectors/track, 14593 cylinders
- Units = cylinders of 16065 * 512 = 8225280 bytes
- Device Boot Start End Blocks Id System
- /dev/sda1 * 1 2330 18715693+ 7 HPFS/NTFS
- /dev/sda2 3826 14593 86493960 f W95 Ext'd (LBA)
- /dev/sda3 2331 3825 12008587+ 83 Linux
- /dev/sda5 3826 9179 43005973+ 7 HPFS/NTFS
- /dev/sda6 9180 9192 104391 83 Linux
- /dev/sda7 9193 10497 10482381 83 Linux
- /dev/sda8 10498 10752 2048256 82 Linux swap / Solaris
- /dev/sda9 10753 10765 104391 83 Linux
- /dev/sda10 10766 11982 9775521 83 Linux
- /dev/sda11 11983 14593 20972826 83 Linux
- Partition table entries are not in disk order
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其中/dev/sda3是用分区魔术师从/dev/sda1(windows xp的c盘,当初把这个盘分得太大)分出来的。
现在要把/dev/sda3和/dev/sda11做成一个logic volume。
1. 在这两个分区上分别建立physical volume:
- # pvcreate /dev/sda3 /dev/sda11
- Physical volume "/dev/sda3" successfully created
- Physical volume "/dev/sda11" successfully created
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pvscan命令输出:
- PV /dev/sda3 lvm2 [11.45 GB]
- PV /dev/sda11 lvm2 [20.00 GB]
- Total: 2 [31.45 GB] / in use: 0 [0 ] / in no VG: 2 [31.45 GB]
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2. 使用vgcreate命令建立volume group,这个volume group就是把两个physical volume合并起来:
- # vgcreate xen-volume /dev/sda3 /dev/sda11
- Volume group "xen-volume" successfully created
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再看pvscan命令的输出,和前一次不一样了:
- PV /dev/sda3 VG xen-volume lvm2 [11.45 GB / 11.45 GB free]
- PV /dev/sda11 VG xen-volume lvm2 [20.00 GB / 20.00 GB free]
- Total: 2 [31.45 GB] / in use: 2 [31.45 GB] / in no VG: 0 [0 ]
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再看看vgdisplay命令的输出:
- # vgdisplay -v xen-volume
- Using volume group(s) on command line
- Finding volume group "xen-volume"
- --- Volume group ---
- VG Name xen-volume
- 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 31.45 GB
- PE Size 4.00 MB
- Total PE 8051
- (注:PE的默认尺寸为4M,这个VG一共有8051个PE,总容量就是VG Size的值31.45GB)
- Alloc PE / Size 0 / 0
- Free PE / Size 8051 / 31.45 GB
- VG UUID DTRys2-7H4v-0cej-CSai-08PK-munx-fCNp7N
- --- Physical volumes ---
- PV Name /dev/sda3
- PV UUID 0y5F7N-Nk3b-ert3-pKtr-ErQp-52Uq-npF5ns
- PV Status allocatable
- Total PE / Free PE 2931 / 2931
- PV Name /dev/sda11
- PV UUID 0khn2p-QALW-N7c3-Xb60-uEXg-0QZ5-iyfHdu
- PV Status allocatable
- Total PE / Free PE 5120 / 5120
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3. 在上面建立的名为“xen-volume”的volume group上创建一个容量为31G的,名称为“xen-lv”的logic volume:
- # lvcreate -L 31G -n xen-lv xen-volume
- Logical volume "xen-lv" created
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查看Logic volume的device node,这个device node的命名规则是volume group + logic volume:
- # ls -al /dev/mapper/
- 总计 0
- drwxr-xr-x 2 root root 80 10-05 14:14 .
- drwxr-xr-x 14 root root 3940 10-05 14:14 ..
- crw------- 1 root root 10, 62 10-05 09:07 control
- brw-rw---- 1 root disk 253, 0 10-05 14:14 xen--volume-xen--lv
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另外,在/dev目录
下有一个以volume group为名字的目录,这个目录下有一个以logic volume为名字的软链接文件
,这个文件指向/dev/mapper下的device node。
- # ls -al /dev/xen-volume/
- 总计 0
- drwx------ 2 root root 60 10-05 14:14 .
- drwxr-xr-x 14 root root 3940 10-05 14:14 ..
- lrwxrwxrwx 1 root root 31 10-05 14:14 xen-lv -> /dev/mapper/xen--volume-xen--lv
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查看Logic volume的属性:
- # lvdisplay /dev/xen-volume/xen-lv
- --- Logical volume ---
- LV Name /dev/xen-volume/xen-lv
- VG Name xen-volume
- LV UUID mzd2qO-53e6-WHw2-B37n-hqjK-zYha-O3rViE
- LV Write Access read/write
- LV Status available
- # open 0
- LV Size 31.00 GB
- Current LE 7936
- Segments 2
- Allocation inherit
- Read ahead sectors 0
- Block device 253:0
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4. 在logic volume上建立系统
:
- # mkfs.ext3 /dev/xen-volume/xen-lv
- mke2fs 1.39 (29-May-2006)
- Filesystem label=
- OS type: Linux
- Block size=4096 (log=2)
- Fragment size=4096 (log=2)
- 4063232 inodes, 8126464 blocks
- 406323 blocks (5.00%) reserved for the super user
- First data block=0
- Maximum filesystem blocks=0
- 248 block groups
- 32768 blocks per group, 32768 fragments per group
- 16384 inodes per group
- Superblock backups stored on blocks:
- 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
- 4096000, 7962624
- Writing inode tables: done
- Creating journal (32768 blocks): done
- Writing superblocks and filesystem accounting information:
- done
- This filesystem will be automatically checked every 38 mount
s or - 180 days, whichever comes first. Use tune2fs -c or -i to override.
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5. 加载logic volume到目录:
- # mount /dev/xen-volume/xen-lv /xen/
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查看结果:
- # df
- 文件系统
1K-块 已用 可用 已用% 挂载点 - /dev/sda7 10153988 8359088 1270784 87% /
- /dev/sda6 101086 15521 80346 17% /boot
- tmpfs 466256 0 466256 0% /dev/shm
- /dev/sda1 18715692 14723668 3992024 79% /windows/c
- /dev/sda5 43005972 42618084 387888 100% /windows/d
- /dev/mapper/xen--volume-xen--lv
- 31995824 180288 30190244 1% /xen
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6. 在/etc/fstab文件里加一行,让logic volume能够自动
加载:
- /dev/xen-volume/xen-lv /xen ext3 defaults 0 0
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