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System Preparation

1-12 HP Smart Array Multipath Software User Guide

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Writer: Rob Weaver File Name: b-ch1 System Preparation.doc

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Modifying the RAIDTAB Configuration File

To perform multipath operations with a Linux operating system, a raidtab

configuration file must be present. Use the instructions in the following sections to be

sure the raidtab configuration file contains the appropriate information.

RAIDTAB Terms

Observe the following definitions for raidtab terms:

• raiddev—introduces the configuration for a particular device

• nr-raid-disks—the number of raid disks in the array; specified in the /dev/cciss

directory

• persistent-superblock—must be set to 1 if an md device is to be mounted/used

during a reboot

• chunk-size—sets the stripe size in bytes, in the power of 2

• device—the physical device that makes up the RAID array

• raid-disk—the index of the device in the RAID array

For more information, refer to the operating system documentation.

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.

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HP Modular Smart Array 500 Starter Kit Manuale Utente Pagina 20