HP StorageWorks 500 - G2 Modular Smart Array User Manual page 17

Sample RAIDTAB configuration file
The following raidtab sample file is for a multipath configuration with three partitions (/dev/md0,
/dev/md1, and /dev/md2) where each md device represents a partition on the device. If another
partition is needed, add it as /dev/md3 with the same characteristics as the preceding partitions.
The limit for number of partitions is four primary partitions. However, creating one of the four partitions as
a type "type 0xf" Win 95 Ext'd (LBA) partition enables you to create extended logical partitions inside of
the primary partition. Inside of the extended partition, you can create additional Linux partitions.
The raidtab configuration file must reside in the /etc directory. The contents of /etc/raidtab should
resemble the following:
raiddev /dev/md0
raid-level
nr-raid-disks
persistent-superblock
chunk-size
device
raid-disk
device
raid-disk
raiddev /dev/md1
raid-level
nr-raid-disks
persistent-superblock
chunk-size
device
raid-disk
device
raid-disk
raiddev /dev/md1
raid-level
nr-raid-disks
persistent-superblock
chunk-size
device
raid-disk
device
raid-disk
Completing the Linux multipath setup
After a valid raidtab file is created in the /etc directory, verify that the correct drivers and modules are
loaded.
Verify that the md and multipath drivers are loaded, either statically or by a module load. Enter:
1.
lsmod
multipath
2
1
8
/dev/cciss/c0d2p1
0
/dev/cciss/c1d2p1
1
multipath
2
1
8
/dev/cciss/c0d2p2
0
/dev/cciss/c1d2p2
1
multipath
2
1
8
/dev/cciss/c0d2p3
0
/dev/cciss/c1d2p3
1
Installation and operation in Red Hat Enterprise Linux 2.1 environments 17