Set up multipath environment testing with iSCSI protocol on VMware Virtual Machine multipath (4)

Installation and ConfigurationDm-multipathInstallation RunDmSoftware

# yum Install Device-mapper-multipath  

#/etc/init.d/multipathdrestart

Ok

stopping Multipathddaemon: [OK]

Starting Multipathddaemon: [OK]

MULTIPATHD Once the service is started, it will pass SCSI ID automatically find multiple paths for the same device, and install the default settings to aggregate them for use.

# MULTIPATH-LL

MPATHB (1IET 00010001) dm-3 lb,lb_iscsi # ' 1IET 00010001 'represents remote device information(centos6.5of theDM multipath 0.4.9use it asSCSI ID) dm-3 lbindicates vendorLB_ISCSIProduct Information  This allows for a single point of failure

size=5.0g features= ' 0 ' hwhandler= ' 0 ' WP=RW

|-+-policy= ' round-robin 0 ' prio=1 status=active #status =active the link used by default

| '-3:0:0:1 SDB 8:16 Activeready Running

'-+-policy= ' round-robin 0 ' prio=1 status=enabled #status =enabled valid link, but not active link , Alternate Link

'-4:0:0:1 SDD 8:48 active ready Running

ConfigurationMultipath

2.1 Modify File/etc/multipath.conf

By default, the/etc directory does not have configuration file multipath.conf. It needs to be copied from the/usr/share/doc/directory.

#cp/usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf/etc/     

can With man multipath.conf command or view file/usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf. annotated Span style= "font-size:12px;font-family: ' italics _gb2312 '; Letter-spacing:0;background: #FFFFFF;" > Understand the interpretation of configuration options.

In this case, by adding the following configuration lines to the file, we have a SCSI ID of "1IET 00010001" device is set up Round-robin load Balancing Mode (default is Active-standby mode)

multipaths {

multipath {

Wwid "1IET 00010001"

Alias Yellow

Path_grouping_policy Multibus

Path_selector "Round-robin 0"

failback Manual

Rr_weight Priorities

No_path_retry 5

}

2.2 Restart MULTIPATHD services for changes to take effect

#/etc/init.d/multipathdrestart

#/etc/init.d/iscsirestart # actual combat discovery must do this step, otherwise there is a problem, cause unknown origin

ValidationMultpathConfiguration

# MULTIPATH-LL

Yellow (1IET 00010001) dm-2 LB,LB_ISCSI

size=10g features= ' 1queue_if_no_path ' hwhandler= ' 0 ' WP=RW

'-+-policy= ' round-robin 0 ' prio=1 status=active

|-6:0:0:1 SDC 8:32 active ready Running # Here you can see that the devices are Active Status

'-5:0:0:1 SDB 8:16 active ready Running # Here you can see that the devices are Active Status

analog NIC failure, verifyingMultipathof theFailoverfunction

# Ifdown Eth2 # wait a few seconds after execution to let DM confirm that the IP Path Down off

Device State:3 (Disconnected)

# MULTIPATH-LL

Mar 17:12:21 |/etc/multipath.conf line, invalid Keyword:path_checker

Yellow (1IET 00010001) dm-2 LB,LB_ISCSI

size=10g features= ' 1queue_if_no_path ' hwhandler= ' 0 ' WP=RW

'-+-policy= ' round-robin 0 ' prio=1status=active

|-7:0:0:1 SDD 8:48 active faulty running

'-8:0:0:1 SDC 8:32 Active ready Running

# ifup Eth2

Active Connection state:activated

Active Connection PATH:/ORG/FREEDESKTOP/NETWORKMANAGER/ACTIVECONNECTION/3

# MULTIPATH-LL

Mar 17:15:43 |/etc/multipath.conf line, invalid Keyword:path_checker

Yellow (1IET 00010001) dm-2 LB,LB_ISCSI

size=10g features= ' 1queue_if_no_path ' hwhandler= ' 0 ' WP=RW

'-+-policy= ' round-robin 0 ' prio=1 status=active

|-7:0:0:1 SDD 8:48 failed ready running

'-8:0:0:1 SDC 8:32 Active ready Running

# Sleep # wait - seconds

# Multipath–ll # path Recovery at this time

Mar 17:17:05 |/etc/multipath.conf line, invalid Keyword:path_checker

Yellow (1IET 00010001) dm-2 LB,LB_ISCSI

size=10g features= ' 1 queue_if_no_path ' hwhandler= ' 0 ' WP=RW

'-+-policy= ' round-robin 0 ' prio=1 status=active

|-7:0:0:1 SDD 8:48 active ready Running

'-8:0:0:1 SDC 8:32 Active readyrunning

Set up multipath environment testing with iSCSI protocol on VMware Virtual Machine multipath (4)