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5. Activate the RAID device with raidstart. 6. Create a file system on the RAID device (mkfs) and then mount it.
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Creating Hard Disk Partitions: fd
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To add new RAID devices or to create them in the first place, you need to manually create the hard disk partitions they will use, and then configure RAID devices to use those partitions. To create a hard disk partition for use in a RAID array, use fdisk or parted and specify fd as the file system type. You invoke fdisk or parted with the device name of the hard disk you want to create the partition on. Be sure to specify fd as the partition type. The following example invokes fdisk for the hard disk /dev/hdb (the second hard disk on the primary IDE connection): fdisk /dev/hdb Though technically partitions, these hard disk devices are referred to as disks in RAID configuration documentation and files.
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Configuring RAID: /etc/raidtab
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Once you have your disks, you then need to configure them as RAID devices. RAID devices are configured in the /etc/raidtab file. This file will be used by the mkraid command to create the RAID device. In the /etc/raidtab file, you create a raiddev entry for each RAID device, and specify which disks they will use along with any RAID options. For a raiddev entry, you specify the name of the RAID device you are configuring, such as /dev/md0 for the first RAID device. raiddev /dev/md0
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You then specify the level for the RAID device, such as 0, 1, or 5 using the keyword raid-level followed by the rail level number. Then add any options you may need, along with the list of disks making up the RAID array. A disk is defined with the device entry, and its position
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in the RAID array with the raid-disk option. The configuration directives and options are listed in Table 6-3. A sample entry for the /etc/raidtab file is shown here: raiddev /dev/md0 raid-level nr-raid-disks nr-spare-disks persistent-superblock chunk-size parity-algorithm device raid-disk device raid-disk device raid-disk 5 3 1 1 4 left-symmetric /dev/hdb1 0 /dev/hdc1 1 /dev/hdd1 0
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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-sparedisks). The RAID file system uses persistent superblocks (persistent-superblock) to hold file system configuration information, allowing your devices to be automatically detected. 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.
Directives and Options raiddev device raid-level num Description Starts a configuration section for a particular RAID device. The RAID level for the RAID device, such as 0, 1, 4, 5, and 1 (linear).
Table 6-3.
raidtab Options
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Directives and Options device disk-device Description The disk device (partition) to be added to the RAID array. The number of device entries specified for a RAID device must match that specified by nr-raid-disks. Number of RAID devices in an array. Each RAID device section must have this directive. The maximum limit is 12.
nr-raid-disks count
nr-spare-disks count The number of spare devices in the array. Used only for RAID 4 and RAID 5. The kernel must be configured to and allow the automatic addition of new RAID disks as needed. You can add and remove spare disks with raidhotadd and raidhotremove. persistentsuperblock 0/1 Specifies whether a newly created RAID array should use a persistent superblock. Used to help the kernel automatically detect the RAID array. RAID array information is kept in a superblock on each RAID member. Sets the stripe size to size bytes, in powers of 2. Adds the most recently defined device to the list of devices which make up the RAID system. Inserts the most recently defined RAID device at the specified position in the RAID array. Inserts the most recently defined RAID device as a spare device at the specified position in the RAID array.
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