Red Hat ENTERPRISE LINUX 5.1 DM MULTIPATH Bedienungsanleitung PDF herunterladen (Seite 3)

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Installation

All the necessary rpm packages can be found in the RHEL5 DVD, install them as

follows:

# rpm –ivh iscsi-initiator-utils-6.2.0.742-0.5.el5

# rpm –ivh device-mapper-1.02.13-1.el5 // Usually be included

// in default setup

// of RHEL5

# rpm –ivh device-mapper-multipath-0.4.7-8.el5

Configuration

Part 1: Usage of iSCSI initiator

1. The iSCSI initiator name can be specified in the configuration file

/etc/iscsi/initiatorname.iscsi.

# vi /etc/iscsi/initiatorname.iscsi

InitiatorName = Your_initiator_name

2. Edit the configuration file of iSCSI initiator in /etc/iscsi/iscsid.conf, the iscsi

session timeout value has to be changed to a proper value. The default value is

120 seconds, but it is too long to keep the I/O wait before the path is judged as

fail and it may cause the I/O failure. Please set a shorter and proper timeout

value in this configuration file.

# vi /etc/iscsi/iscsid.conf

node.session.timeo.replacement_timeout = 30 // Please set a proper

// timeout value

3. In /etc/iscsi/iscsid.conf, it also provides others settings, such as:

node.startup = Automatic

// Set auto-login when

// discover target

isns.address = 192.168.x.x // Set iSNS server IP

isns.port = 3205 // The port no. used by

// iSNS

node.session.auth.authmethod = CHAP // Enable CHAP auth.

node.session.auth.username = username // Set CHAP username

node.session.auth.password = password // Set CHAP password

4. Please restart the iSCSI service to make these changes work.

# service iscsi restart

5. The rpm package iscsi-initiator-utils provides a command line tool called

iscsiadm. It can manage the connections to iSCSI target. The iscsiadm tool

has three operational modes – discovery, node, and session. The following will

introduce these modes.

Operational mode – discovery is used to discover the target, the usage is

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Red Hat ENTERPRISE LINUX 5.1 DM MULTIPATH Bedienungsanleitung Seite 3