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The steps involved in creating and accessing logical volumes are described in following commands In this example there are two hard disk drives that will be combined into one LVM drive The hard drives are Serial ATA drives identified on the systems as sdb and sdc Each drive is first partitioned with a single LVM physical partition Use a partition creation tool like fdisk or parted to create the physical partitions on the hard disks sdb and sdc In this example, you create the partitions sdb1 and sdc1 You first initialize the physical volumes with the pvcreate command The sda1 and sda2 partitions in the sda entry are reserved for the boot and root partitions and are never initialized
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pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1
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You then create the logical groups you want using the vgcreate command In this case there is one logical group, mymedia The mymedia group uses sdb1 and sdc1 If you create a physical volume later and want to add it to a volume group, you use the vgextend command
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vgcreate mymedia /dev/sdb1 /dev/sdc1
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You can now create the logical volumes in each volume group, using the lvcreate command In this example two logical volumes are created, one for myvideos and another for mypics The corresponding lvcreate commands are shown here:
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lvcreate lvcreate -n myvideo -n mypics -l 540GB -l 60GB mymedia mymedia
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Then you can activate the logical volumes Reboot and use vgchange with the -a y option to activate the logical volumes
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vgchange -a y mymedia
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You can now make file systems for each logical volume
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mkfsext3 myvideo mkfsext3 mypics
Then you can mount the logical volumes In this example they are mounted to subdirectories of the same name in /mydata
mount t ext3 /dev/mymedia/mypics /mydata/mypics mount t ext3 /dev/mymedia/myvideo /mydata/myvideo
Using LVM to Replace Drives
LVM can be very useful when you need to replace an older hard drive with a new one Hard drives are expected to last about six years on the average You might also want to just replace the older drive with a larger one (available hard drive storage sizes double every year or so) To replace an on-boot hard drive is very easy To replace a boot drive becomes much more complicated
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R A I D a n d LV M
To replace a drive, simply incorporate the new drive into your logical volume The size of your logical volume will increase accordingly You can use the pmove command to move data from the old drive to the new one Then, issue commands to remove the old one From the user and system point of view there will be no changes Files from your old drive will still be stored in the same directories, though the actual storage will be implemented on the new drive Replacement with LVM become more complicated if you want to replace your boot drive, the hard drive your system starts up from and that holds your Linux kernel The boot drive contains a special boot partition and the master boot record The boot partition cannot be part of any LVM volume You first have to create a boot partition on the new drive using a partition tool like parted or fdisk, labeling it as boot The boot drive is usually very small, about 200 MB Then mount the partition on your system and copy the contents of your /boot directory to it Then you add the remainder of the disk to your logical volume and logically remove the old disk, copying the contents of the old disk to the new one You still have to boot with the Linux rescue DVD (or install DVD in rescue mode) and issue the grub-install command to install the master boot record on your new drive You can then boot from the new drive
PART VII PART I PART I PART I PART I PART I PART I
LVM Example for Partitions on Different Hard Drives
In a more complex implementation, you can use partitions on different hard drives for the same logical volumes For example, if you have physical volumes consisting of the hard disk partitions hda2, hda3, hdb1, hdb2, and hdb3 on two hard disks, hda and hdb, you can assign some of them to one logical group and others to another logical group The partitions making up the different logical groups can be from different physical hard drives For example, hda2 and hdb3 could belong to the logical group turtle and hda3, hdb2, and hdb3 could make up a different logical group, say rabbit The logical group name could be any name you want to give it It is much like naming a hard drive
NOTE The examples here use the hd prefix for referencing drives Some distributions, like Fedora,
have dropped the hd prefix and use the sd prefix for both ATA and Serial hard drives Using the example in Figure 30-1, the steps involved in creating and accessing logical volumes are described in following commands First, use a partition creation tool like fdisk or parted to create the physical partitions on the hard disks hda and hdb In this example, you create the partitions hda1, hda2, hda3, hdb1, hdb2, hdb3, and hdb4 Next, initialize the physical volumes with the pvcreate command The hda1 and hda2 partitions are reserved for the boot and root partitions and are not initialized
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