CentOS/RedHat 6 iSCSI connections with multipathing

small Howto…

Install multipathing RPMs:
yum install device-mapper
yum install device-mapper-multipath

start multipath service
service multipathd start

configure autostart for multipath service
chkconfig multipathd on

optional: install Netapp host utilities when using a filer
rpm -ivh netapp_linux_host_utilities-6-2.x86_64.rpm

loading the alua driver:
add “rdloaddriver=scsi_dh_alua” to the kernel command in grub file /boot/grub/grub.conf

discover iSCSI targets (one target IP should be enough, even when multiple exist)
iscsiadm -m discovery -t st -p

login after a successful discovery. you’ll get the iqn from the previous command.
iscsiadm -m node -l -T -p :3260

show iscsi sessions:
iscsiadm -m session [-P 3]

configure/load multipath:

check the pathes:
multipath -ll

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