Red Hat ENTERPRISE LINUX 5.1 DM MULTIPATH Manuale Utente Scaricare il pdf (Pagina 5)

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# iscsiadm –m session –r session_id –u

# iscsiadm –

session –r 0 –

Logging out of session [sid: 1, target: iqn.2004-08…(omission)…p150c-

0a8a27a:default-target , portal: 192.168.11.150,3260]

Logout of [sid: 1, target: iqn.2004-08…(omission)…p150c-0a8a27a:default-

target , portal: 192.168.11.150,3260]: successful

Part 2: How to setup DM-Multipath

The procedures of setup a failover DM-Multipath are on the following.

1. Edit /etc/multipath.conf file and remove the comment mark “#” of the following

lines to enable multipath. It means that multipath will put all devices in the

blacklist.

# vi /etc/multipath.conf

# blacklist { // Remove the comment mark

# devnode “*” // “#” to enable multi-

# } // path.

2. The default setting of DM-Multipath is compiled in the system and does not need

to be modified in the /etc/multipath.conf. The default value of

path_grouping_ploicy is failover. Please refer to the document DM_Multipath.pdf

in reference for detail.

This is the advanced usage. The local disks can be excluded when generating

multipath devices.

1. Determine which WWN of local disks will be ignored. In this example, using the

command multipath can find out the WWN of local disk /dev/sda.

# multipath –F

# multipath –d

create: mpath0(SATA_HDS728040PLA320_PFDAV3SAU2D60X) ATA,HDSXXX

[size=38G][features=0][hwhandler=0]

\_ round-robin 0 [prio=1][undef]

\_ 1:0:0:0 sda 8:0 [undef][ready]

create: mpath1 (314a0a87813000f22) Qsan,P150C

[size=50G][features=0][hwhandler=0]

\_ round-robin 0 [prio=1][undef]

\_ 3:0:0:0 sdc 8:32 [undef][ready]

The WWN of local disk /dev/sda is in the parenthesis followed by the word

“mpath0”.

2. Edit /etc/multipath.conf, and insert the WWN of local disk into the blacklist.

# vi /etc/multipath.conf

blacklist {

wwid SATA_HDS728040PLA320_PFDAV3SAU2D60X

}

Then the local disk will be ignored when generating the multipath devices.

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