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一、建立LVM Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 650 5116702+ 83 Linux /dev/sda3 651 781 1052257+ 82 Linux swap / Solaris [root@localhost ~]# fdisk /dev/sda The number of cylinders for this disk is set to 1044.
There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): n
Command action e extended p primary partition (1-4) e Selected partition 4 First cylinder (782-1044, default 782): Using default value 782 Last cylinder or +size or +sizeM or +sizeK (782-1044, default 1044): Using default value 1044 Command (m for help): n
First cylinder (782-1044, default 782): Using default value 782 Last cylinder or +size or +sizeM or +sizeK (782-1044, default 1044): +50M Command (m for help): n
First cylinder (789-1044, default 789): Using default value 789 Last cylinder or +size or +sizeM or +sizeK (789-1044, default 1044): +50M Command (m for help): t
Partition number (1-6): 5 Hex code (type L to list codes): 8e Changed system type of partition 5 to 8e (Linux LVM) Command (m for help): t
Partition number (1-6): 6 Hex code (type L to list codes): 8e Changed system type of partition 6 to 8e (Linux LVM) Command (m for help): p
Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 650 5116702+ 83 Linux /dev/sda3 651 781 1052257+ 82 Linux swap / Solaris /dev/sda4 782 1044 2112547+ 5 Extended /dev/sda5 782 788 56196 8e Linux LVM /dev/sda6 789 795 56196 8e Linux LVM Command (m for help): w
The partition table has been altered! Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at the next reboot. Syncing disks. [root@localhost ~]# partprobe Warning: Unable to open /dev/hdc read-write (Read-only file system). /dev/hdc has been opened read-only. [root@localhost ~]# pvcreate /dev/sda5 Physical volume “/dev/sda5″ successfully created 2、建立vg [root@localhost ~]# vgcreate mainVG /dev/sda5 Volume group “mainVG” successfully created 3、建立lv [root@localhost ~]# lvcreate -L 20M -n lstLV mainVG Logical volume “lstLV” created 二、调整LVM 1、调整vg [root@localhost ~]# pvcreate /dev/sda6 Physical volume “/dev/sda6″ successfully created [root@localhost ~]# vgextend mainVG /dev/sda6 /dev/cdrom: open failed: Read-only file system Attempt to close device ‘/dev/cdrom’ which is not open. Volume group “mainVG” successfully extended [root@localhost ~]# vgdisplay mainVG | grep ‘VG Size’ VG Size 104.00 MB [root@localhost ~]# vgreduce mainVG /dev/sda6 Removed “/dev/sda6″ from volume group “mainVG” [root@localhost ~]# vgdisplay mainVG | grep ‘VG Size’ VG Size 52.00 MB 2、调整lv [root@localhost ~]# mkfs.ext3 /dev/mainVG/lstLV [root@localhost ~]# lvextend -L +20M /dev/mainVG/lstLV Extending logical volume lstLV to 40.00 MB Logical volume lstLV successfully resized [root@localhost ~]# tune2fs -l /dev/mainVG/lstLV | grep Block Block count: 20480 Block size: 1024 Blocks per group: 8192 [root@localhost ~]# resize2fs /dev/mainVG/lstLV resize2fs 1.39 (29-May-2006) Resizing the filesystem on /dev/mainVG/lstLV to 40960 (1k) blocks. The filesystem on /dev/mainVG/lstLV is now 40960 blocks long. [root@localhost ~]# tune2fs -l /dev/mainVG/lstLV | grep Block
Block count: 40960 Block size: 1024 Blocks per group: 8192 [root@localhost ~]# e2fsck -f /dev/mainVG/lstLV e2fsck 1.39 (29-May-2006) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/mainVG/lstLV: 11/8560 files (9.1% non-contiguous), 2368/40960 blocks [root@localhost ~]# resize2fs /dev/mainVG/lstLV 20M resize2fs 1.39 (29-May-2006) Resizing the filesystem on /dev/mainVG/lstLV to 20480 (1k) blocks. The filesystem on /dev/mainVG/lstLV is now 20480 blocks long. [root@localhost ~]# lvreduce -L 20M /dev/mainVG/lstLV
WARNING: Reducing active logical volume to 20.00 MB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lstLV? [y/n]: y Reducing logical volume lstLV to 20.00 MB Logical volume lstLV successfully resized |
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