Novell LINUX ENTERPRISE SERVER 10 - STORAGE ADMINISTRATION GUIDE 7-2007, Administration Manual

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Managing Software RAIDs 6 and 10 with mdadm 85
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The procedure in this section uses the device names shown in the following table. Make sure to
modify the device names with the names of your own devices.
Table 7-4
Scenario for Creating a RAID 10 (0+1) by Nesting
1 Open a terminal console, then log in as the root user or equivalent.
2 Create 2 software RAID 0 devices, using two different devices for each RAID 0 device. At the
command prompt, enter these two commands:
mdadm --create /dev/md0 --run --level=0 --chunk=64 --raid-devices=2
/dev/sdb1 /dev/sdc1
mdadm --create /dev/md1 --run --level=0 --chunk=64 --raid-devices=2
/dev/sdd1 /dev/sde1
The default chunk size is 64 KB.
3 Create the nested RAID 0+1 device. At the command prompt, enter the following command
using the software RAID 0 devices you created in
Step 2 :
mdadm --create /dev/md2 --run --level=1 --raid-devices=2 /dev/md0 /
dev/md1
4 Create a file system on the RAID 0+1 device
/dev/md2
, such as a Reiser file system
(reiserfs). For example, at the command prompt, enter
mkfs.reiserfs /dev/md2
Modify the command if you want to use a different file system.
5 Edit the
/etc/mdadm.conf
file to add entries for the component devices and the RAID
device
/dev/md2
.
6 Edit the
/etc/fstab
file to add an entry for the RAID 0+1 device
/dev/md2
.
7 Reboot the server.
The RAID 0+1 device is mounted to
/local
.
7.3 Creating a Complex RAID 10 with mdadm
Š
Section 7.3.1, “Understanding the mdadm RAID10,” on page 86
Š
Section 7.3.2, “Creating a RAID10 with mdadm,” on page 88
Raw Devices RAID 0 (stripe) RAID 0+1 (mirrored stripes)
/dev/sdb1 /dev/md0 /dev/md2
/dev/sdc1
/dev/sdd1 /dev/md1
/dev/sde1