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You then create the logical groups you want using the vgcreate command In this case there are two logical groups, turtle and rabbit The turtle group uses hdb1 and hdb3, and rabbit uses hda3, hdb2, and hdb4 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 turtle vgcreate rabbit /dev/hdb1 /dev/hdb3 /dev/hda3 /dev/hdb2 /dev/hdb4
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Part VII:
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System Administration
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FIGURE 30-1 Logical volume using multiple partitions on different hard drives
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You can now create the logical volumes in each volume group, using the lvcreate command
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lvcreate lvcreate lvcreate -n var -n home -n projects -l 2000M -l 50000M -l 20000M turtle rabbit rabbit
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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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You can now make file systems for each logical volume
mkfsext3 var mkfsext3 home mkfsext3 projects
Then you can mount the logical volumes
mount t ext3 /dev/turtle/var /var mount t ext3 /dev/rabbit/home /home mount t ext3 /dev/rabbit/projects /mnt/myprojects
30:
R A I D a n d LV M
LVM Snapshots
A snapshot records the state of the logical volume at a designated time It does not create a full copy of data on the volume, just changes since the last snapshot A snapshot defines the state of the data at a given time This allows you to backup the data in a consistent way Also, should you need to restore a file to its pervious version, you can use the snapshot of it Snapshots are treated as logical volume and can be mounted, copied, or deleted To create a snapshot you use the lvcreate command with the -s option In this example the snapshot is given the name mypics-snap1 (-n option) You need to specify the full device name for the logical group you want to create the snapshot for Be sure there is enough free space available in the logical group for the snapshot In this example, the snapshot logical volume is created in the /dev/mymedia logical group It could just as easily be created in any other logical group Though a snapshot normally uses very little space, you have to guard against overflows If the snapshot is allocated the same size as the original, it will never overflow For systems where little of the original data changes, the snapshot can be very small The following example allocate one third the size of the original (60 GB)
lvcreate -s n mypics-snap1 -l 20GB /dev/mymedia
PART VII PART I PART I PART I PART I PART I PART I
You can then mount the snapshot as you would any other file system
mount /dev/mymedia/mypicsnap1 /mysnaps
To delete a snapshot you use the lvremove command, removing it like you would any logical volume
lvremove -f /dev/mymedia/mypicsnap1
Snapshots are very useful for making backups, while a system is still active You can use tar or dump to backup the mounted snapshot to a disk or tape All the data from the original logical volume will be included, along with the changes noted by the snapshot Snapshots also allow you to perform effective undo operations You can create a snapshot of a logical volume Then unmount the original and mount the snapshot in its place Any changes you make will be performed on the snapshot, not the original Should problems occur, unmount the snapshot and then mount the original This restores the original state of your data You could also do this using several snapshots, restoring to a previous snapshot With this procedure, you could test new software on a snapshot, without endangering your original data The software would be operating on the snapshot, not the original logical volume You can also use them as alternative versions of a logical volume You can read and write to a snapshot A write will change only the snapshot volume, not the original, creating, in effect, an alternate version
Configuring RAID Devices
RAID is a method of storing data across several disks to provide greater performance and redundancy In effect, you can have several hard disks treated as just one hard disk by your operating system RAID then efficiently stores and retrieves data across all these disks,
Part VII:
System Administration
instead of having the operating system access each one as a separate file system Lowerlevel details of storage and retrieval are no longer a concern of the operating system This allows greater flexibility in adding or removing hard disks, as well as implementing redundancy in the storage system to provide greater reliability With RAID, you can have several hard disks that are treated as one virtual disk, where some of the disks are used as real-time mirrors, duplicating data You can use RAID in several ways, depending upon the degree of reliability you need When you place data on multiple disks, I/O operations can overlap in a balanced way, improving performance Because having multiple disks increases the mean time between failures (MTBF), storing data redundantly also increases fault tolerance RAID can be implemented on a hardware or software level On a hardware level, you can have hard disks connected to a RAID hardware controller, usually a special PC card Your operating system then accesses storage through the RAID hardware controller Alternatively, you can implement RAID as a software controller, letting a software RAID controller program manage access to hard disks treated as RAID devices The software version lets you use IDE hard disks as RAID disks Linux uses the MD driver, supported in the 24 kernel, to implement a software RAID controller Linux software RAID supports five levels (linear, 0, 1, 4, 5, and 6), whereas hardware RAID supports many more Hardware RAID levels, such as 7 10, provide combinations of greater performance and reliability
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