LVM-HOWTO/学习笔记(二)
1. 在3块scsi磁盘上创建lv
Run pvcreate on the disks
# pvcreate /dev/sda # pvcreate /dev/sdb # pvcreate /dev/sdc |
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Create a volume group
# vgcreate my_volume_group /dev/sda /dev/sdb /dev/sdc/ |
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Run vgdisplay to verify volume group
# vgdisplay # vgdisplay --- Volume Group --- VG Name my_volume_group VG Access read/write VG Status available/resizable VG # 1 MAX LV 256 Cur LV 0 Open LV 0 MAX LV Size 255.99 GB Max PV 256 Cur PV 3 Act PV 3 VG Size 1.45 GB PE Size 4 MB Total PE 372 Alloc PE / Size 0 / 0 Free PE / Size 372/ 1.45 GB VG UUID nP2PY5-5TOS-hLx0-FDu0-2a6N-f37x-0BME0Y |
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创建lv
# lvcreate -L1G -nmy_logical_volume my_volume_grouplvcreate -- doing automatic backup of "my_volume_group"lvcreate -- logical volume "/dev/my_volume_group/my_logical_volume" successfully created创建文件系统
# mke2fs /dev/my_volume_group/my_logical_volumemke2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09Filesystem label=OS type: LinuxBlock size=4096 (log=2)Fragment size=4096 (log=2)131072 inodes, 262144 blocks13107 blocks (5.00%) reserved for the super userFirst data block=09 block groups32768 blocks per group, 32768 fragments per group16384 inodes per groupSuperblock backups stored on blocks: 32768, 98304, 163840, 229376Writing inode tables: doneWriting superblocks and filesystem accounting information: done测试文件系统
Mount the logical volume and check to make sure everything looks correct
# mount /dev/my_volume_group/my_logical_volume /mnt # df Filesystem 1k-blocks Used Available Use% Mounted on /dev/hda1 1311552 628824 616104 51% / /dev/my_volume_group/my_logical_volume 1040132 20 987276 0% /mnt |
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2. 在3块scsi磁盘上创建条带化的lv
Run pvcreate on the disks:
# pvcreate /dev/sda # pvcreate /dev/sdb # pvcreate /dev/sdc |
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Create a volume group
# vgcreate my_volume_group /dev/sda /dev/sdb /dev/sdc |
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Run vgdisplay to verify volume group
# vgdisplay --- Volume Group --- VG Name my_volume_group VG Access read/write VG Status available/resizable VG # 1 MAX LV 256 Cur LV 0 Open LV 0 MAX LV Size 255.99 GB Max PV 256 Cur PV 3 Act PV 3 VG Size 1.45 GB PE Size 4 MB Total PE 372 Alloc PE / Size 0 / 0 Free PE / Size 372/ 1.45 GB VG UUID nP2PY5-5TOS-hLx0-FDu0-2a6N-f37x-0BME0Y |
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The logical volume will be a striped set using for the 4k stripe size. This should increase the performance of the logical volume
# lvcreate -i3 -I4 -L1G -nmy_logical_volume my_volume_grouplvcreate -- rounding 1048576 KB to stripe boundary size 1056768 KB / 258 PElvcreate -- doing automatic backup of "my_volume_group"lvcreate -- logical volume "/dev/my_volume_group/my_logical_volume" successfully createdNote | |
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If you create the logical volume with a '-i2' you will only use two of the disks in your volume group. This is useful if you want to create two logical volumes out of the same physical volume, but we will not touch that in this recipe. |
创建文件系统
# mke2fs /dev/my_volume_group/my_logical_volumemke2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09Filesystem label=OS type: LinuxBlock size=4096 (log=2)Fragment size=4096 (log=2)132192 inodes, 264192 blocks13209 blocks (5.00%) reserved for the super userFirst data block=09 block groups32768 blocks per group, 32768 fragments per group14688 inodes per groupSuperblock backups stored on blocks: 32768, 98304, 163840, 229376Writing inode tables: doneWriting superblocks and filesystem accounting information: done查看文件系统
mount /dev/my_volume_group/my_logical_volume /mnt |
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and check to make sure everything looks correct
# df Filesystem 1k-blocks Used Available Use% Mounted on /dev/hda1 1311552 628824 616104 51% / /dev/my_volume_group/my_logical_volume 1040132 20 987276 0% /mnt |
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