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Table 32-15: raidtab Options Description the RAID array. RAID array information is kept in a superblock on each RAID member.
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Sets the stripe size to size bytes, in powers of 2. Adds the most recently devined device to the list of devices that make up the RAID system. Inserts the most recently devined RAID device at the specified position in the RAID array. Inserts the most recently devined RAID device as a spare device at the specified position in the RAID array. The most recently devined 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: left-asymmetric, 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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The previous example configures the RAID device /dev/md0 as a RAID 5 (raid-level 5) device. There are three disks (partitions) that make up this RAID array, /dev/hdb1, /dev/hdc1, and /dev/hdd1, of which /dev/hdb1 is the first and /dev/hdc1 is the second. There is one spare disk, /dev/hdd1. There are three RAID disks altogether (nr-raid-disks) and one spare partition (nr-spare-disks). The RAID file system uses persistent super blocks (persistent-superblock) to hold file system configuration information. The parity-algorithm option is used for RAID 5 devices to specify the type of parity algorithm to use for parity restoration-in this example, left-symmetric. Red Hat also provides a set of RAID tools for creating and maintaining RAID partitions and devices. 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 its entry 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 options, if you wish. mkraid operates as a kind of mkfs command for the RAID device, initializing the partitions and creating the RAID file systems. Any data on the partitions making up the RAID array will be erased.
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Once you have created your RAID devices, you can then activate them with the raidstart command. raidstart makes your RAID file system accessible. raidstart takes as its argument the name of the RAID device you want to start. The -a option will activate all RAID devices.
raidstart /dev/md0
Once they 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.
mke2fs /dev/md0
The user then creates a directory called /myraid and mounts the RAID device there.
mkdir /myraid mount /dev/md0 /myraid
Should 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 mount point might normally be used if you created your RAID devices when you installed 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. 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
The raidhotadd and raidhotremove commands are used to add and remove partitions from an active RAID array. You use raidhotadd to add a spare partition and raidhotremove to remove any partitions that have failed. Note raidstop, raidhotadd, and raidhotremove are simply links to the raidstart command. They run the raidstart command with certain options.
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