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FIGURE 30-2
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RAID devices (RAID 5 will require at least three partitions)
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a RAID5 implementation using just two physical hard drives In effect you could have a raid device using four partitions on two hard drives You would, though, lose much of the reliability of a basic three or more drive RAID5 implementation To set up RAID devices so that you have separate partitions for /boot, /home, and / (root), you need to create three different RAID devices, say md0 for /boot, md1 for /home, and md2 for the root If you have two hard disks, for example hda and hdc, each would have three partitions, /boot, /home, and / The first RAID device, md0, would consist of the two /boot partitions, the one on hda and the one on hdc Similarly, the second RAID device, md1, would be made up of the two root partitions, /, the one on hda and the other on hdc md3 would consist of the /home partitions on hda and hdc (see Figure 30-2) When you create the partitions for a particular RAID device, it is important to make sure that each partition has the same size For example, the / partition used for the md0 device on the hda disk must have the same size as the corresponding md0 partition on the hdc disk So if the md1 partition on hda is 20 GB, then its corresponding partition on hdc must also be 20 GB If md2 is 100 GB on one drive, its corresponding partitions on all other drives must also be 100 GB
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Figure 30-2 shows a simple RAID configuration with three RAID devices using corresponding partitions on two hard disks for /boot, / (root), and /home partitions The boot partition is configured as a RAID 1 device because systems can be booted only from a RAID 1 device, not RAID 5 To simplify this example, only two partition are used for RAID5 But keep in mind that RAID5 requires at least three partitions You can set up such a system during installation, selecting and formatting your RAID devices and their partitions using Disk Druid The steps described here assume you have
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your system installed already on a standard IDE drive and are setting up RAID devices on two other IDE disk drives You can then copy your file from your standard drive to your RAID devices First you create the hard disk partitions using a partition tool like parted or fdisk Then, configure the three RAID devices in the /etc/mdadmconf file
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DEVICE /dev/hda1 /dev/hda2 /dev/hda3 /dev/hdc1 /dev/hdc2 /dev/hdc3 devices=/dev/hda1,/dev/hdc1 level=1 num-devices=2 devices=/dev/hda2,/dev/hdc2 level=5 num-devices=2 devices=/dev/hda3,/dev/hdc3 level=5 num-devices=2
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PART VII PART I PART I PART I PART I PART I PART I
ARRAY /dev/md0 ARRAY /dev/md1 ARRAY /dev/md2
Next, create your RAID devices with mdadm, which will then be automatically activated
mdadm --create /dev/md0 /dev/md1 /dev/md2
Create your file systems on the RAID devices
mkfsext3 md0 md1 md2
You can then migrate the /boot, /, and /home files from your current hard disk to your RAID devices Install your boot loader on the first RAID device, md0, and load the root file system from the second RAID device, md1 Alternatively, you can first create the arrays with the mdadm command and then generate the ARRAY entries for an /etc/mdadmconf file from the created RAID information to later manage your arrays, adding or removing components The following commands create the three RAID devices in the previous example:
mdadm --create /dev/md0 --raid-devices=2 /dev/hda1 /dev/hdc1 --level=0 mdadm -C /dev/md2 -n3 /dev/hda2 /dev/hdc2 -l5 mdadm -C /dev/md2 -n3 /dev/hda3 /dev/hdc3 -l5
You can then generate the ARRAY entries for the /etc/mdadmconf file directly using the following command You will still have to edit mdadmconf and add the DEVICE entries as well as the monitoring entries, like MAILADDR
mdadm --detail --scan > /etc/mdadmconf
The previous example could also be implemented using RAID 0 to boot and RAID1 for md1 and md2, making the hdc disk function as a mirror disk for both md0 and md1 arrays
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