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White Paper

Implement iSCSI

multipath in RHEL5

Tim Chung

Version 1.3 (DEC, 2008)

QSAN Technology, Inc.

http://www.qsan.com.tw

White Paper# QWP200801-P150C

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White Paper Implement iSCSI multipath in RHEL5 Tim Chung Version 1.3 (DEC, 2008) QSAN Technology, Inc. http://www.qsan.com.tw Whit

White Paper lntroduction In this document, it describes how to connect an iSCSI target in RHEL via software iSCSI initiator and use the device-mapper

White Paper Installation All the necessary rpm packages can be found in the RHEL5 DVD, install them as follows: # rpm –ivh iscsi-initiator-utils-6.2

White Paper # iscsiadm --mode discovery --type sendtargets --portal target_ip Also can be express as # iscsiadm –m discovery –t st –p target_ip Exa

White Paper # iscsiadm –m session –r session_id –u # iscsiadm –m session –r 0 –u Logging out of session [sid: 1, target: iqn.2004-08…(omission)…p15

White Paper 3. Next, the alias of iSCSI device will be created. The alias name will help iSCSI device to be identified easily. Find the UUID of iSCSI

White Paper 1 print the multipath names only 2 print all info 3 print debug information -p policy force all maps to specified path_grouping_policy

White Paper \_ 3:0:0:0 sdc 8:32 [active][ready] Now, the abstract device /dev/mapper/Qsandisk which groups /dev/sdb and /dev/sdc are ready to be use

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