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Table 6-3.
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Description The most recently defined device is used as the parity device, placing it at the end of the RAID array. For RAID 5 devices, specifies the parity algorithm to use: leftasymmetric, right-asymmetric, left-symmetric, or right-symmetric. The most recently defined device is added to a RAID array as a failed device at the specified position.
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Table 6-3.
raidtab Options (continued)
The mkraid Command
Once you have configured your RAID devices in the /etc/ raidtab file, you then use the mkraid command to create your RAID devices. mkraid takes as its argument the name of the RAID device, such as /dev/md0 for the first RAID device. It then locates the entry for that device in the /etc/ raidtab file and uses that configuration information to create the RAID file system on that device. You can specify an alternative configuration file with the -c option, if you wish. mkraid operates as a kind of mkfs command for RAID devices, initializing the partitions and creating the RAID file systems. Any data on the partitions making up the RAID array will be erased. mkraid /dev/md0
The raidstart Command
Once you have created your RAID devices, you can then activate them with the raidstart command. raidstart 6 makes your RAID file system accessible. raidstart takes as its argument the name of the RAID device you want to start. The -a option activates all RAID devices. 6 raidstart /dev/md0
178 Red Hat Linux Pocket Administrator
Creating a File System
Once the RAID devices are activated, you can then create file systems on the RAID devices and mount those file systems. The following example creates a standard Linux file system on the /dev/md0 device: mkfs.ext3 /dev/md0 In the following example, the user then creates a directory called /myraid and mounts the RAID device there: mkdir /myraid mount /dev/md0 /myraid If you plan to use your RAID device for maintaining your user directories and files, you would mount the RAID device as your /home partition. Such a mounting point might normally be used if you created your RAID devices when installing your system. To transfer your current home directories to a RAID device, first back them up on another partition, and then mount your RAID device, copying your home directories to it.
The raidstop Command
If you decide to change your RAID configuration or add new devices, you first have to deactivate your currently active RAID devices. To deactivate a RAID device, you use the raidstop command. Be sure to close any open files and unmount any file systems on the device first. umount /dev/md0 raidstop /dev/md0
TIP Hot swapping is the practice of replacing drives while the system is running. Its feasibility is limited. Never try to hot swap an IDE drive; you could destroy the drive. SCSI drives might successfully swap, though most likely not. IBM SCA drives can successfully swap. You can use the raidhotadd and raidhotremove commands to perform such a swap.
RAID and LVM
RAID Example
Figure 6-1 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 only be booted from a RAID 1 device, not RAID 5. The other partitions are RAID 5 devices, a more commonly used RAID access method. You could 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 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/raidtab file. raiddev /dev/md0 raid-level nr-raid-disks nr-spare-disks persistent-superblock chunk-size device raid-disk device raid-disk raiddev /dev/md1 raid-level nr-raid-disks persistent-superblock chunk-size parity-algorithm device raid-disk device 1 2 0 1 4 /dev/hda1 0 /dev/hdc1 1
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