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CAUTION The process of creating partitions is irrevocably destructive to the data already on the disk Before creating, changing, or removing partitions on any disk, you must be sure of what you are doing and its consequences The following section will be broken down into several parts: Creating a partition Creating a physical volume Assigning a physical volume to a volume group Creating a logical volume
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The entire process from start to finish may appear a bit lengthy It is actually a simple process in itself, but we intersperse the steps with some extra steps, along with some notes and explanations Let s begin the process Some LVM utilities that we ll be using during the process are listed in Table 7-3
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LVM Command lvcreate
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Description Used for creating a new logical volume in a volume group by allocating logical extents from the free physical extent pool of that volume group Displays the attributes of a logical volume, such as read/write status, size, and snapshot information Initializes a physical volume for use with the LVM system Displays the attributes of physical volumes, such as size and PE size Used for creating new volume groups from block devices created using the pvcreate command Used for adding one or more physical volumes to an existing volume group to extend its size Displays the attributes of volume groups
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Table 7-3 LVM Utilities
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File Systems
Creating a Partition
We will be using the free unpartitioned space on the main system disk, /dev/sda 1 Begin by running fdisk with the -l parameter to list the current partition table Type
[root@fedora-serverA ~]# fdisk -l /dev/sda Disk /dev/sda: 107 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00005158 Device Boot Start End Blocks /dev/sda1 * 1 25 200781 /dev/sda2 26 1200 9438187+
Id 83 8e
System Linux Linux LVM
2 Next, we begin the actual repartitioning process using fdisk again Type
[root@fedora-serverA ~]# fdisk /dev/sda The number of cylinders for this disk is set to 1305 (OUTPUT TRUNCATED) 2) booting and partitioning software from other operating systems (eg, DOS FDISK, OS/2 FDISK) Command (m for help):
You will be presented with a simple fdisk prompt Command (m for help): 3 Print the partition table again while inside the fdisk program Type p at the fdisk prompt to print the partition table
Command (m for help): p Disk /dev/sda: 107 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00005158 Device Boot Start End Blocks /dev/sda1 * 1 25 200781 /dev/sda2 26 1200 9438187+
Id 83 8e
System Linux Linux LVM
A few facts worthy of note regarding this output: The total disk size is approximately 107GB There are currently two partitions defined on the sample system: /dev/sda1 and /dev/sda2 The /dev/sda1 partition is of the type Linux (0x83), and the /dev/sda2 partition is of the type Linux LVM (0x8e)
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From the partitioning scheme we chose during the OS installation, we can deduce that /dev/sda1 houses the /boot file system and /dev/sda2 houses everything else (see the output of the df command for reference) The entire disk spans 1305 cylinders The last partition, ie, /dev/sda2, ends at the 1200-cylinder boundary Therefore, there is room to create a partition that will occupy the space from cylinder 1201 to the last cylinder on the disk (ie, 1305) 4 Type n at the prompt to create a new partition
Command (m for help): n
NOTE If you are curious about the other things you can do at the fdisk prompt, type m to display a help menu 5 Type p to select a primary partition type
Command action e extended P primary partition (1-4) P
6 We want to create the third primary partition Type 3 when prompted for a partition number:
Partition number (1-4): 3
7 The next step is to specify the partition size First we choose the lower limit Accept the default value for the first cylinder Type 1201
First cylinder (1201-1305, default 1201): 1201
8 Instead of designating a megabyte value for the size of this partition, we enter the last cylinder number, thus taking up the remainder of the disk Accept the default suggested for the last cylinder On our sample system, this value is 1305 Type 1305
Last cylinder or +size or +sizeM or +sizeK (1201-1305, default 1305): 1305
9 By default, fdisk creates ext2-type partitions (ie, 0x83) But we want to create a partition of type Linux LVM Change the partition type from the default Linux (0x83) to the Linux LVM type To do this, we use the t (change partition type) command Type t
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