Oracle RAC configuration multipathing

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Abstract ：Oracle RAC Configure multipathing , This paper makes a detailed description

1 install multipath

[[email protected] ~]# rpm -qa | grep device-mapper

 If not, execute the following command to install ：
yum install -y device-mapper*

2 Generate configuration files

mpathconf --enable --with_multipathd y

 see scsi_id
[[email protected] ~]# /usr/lib/udev/scsi_id -g -u /dev/sdb
36000c29f7e6ca7c54bd3ad4d2a2b8939
[[email protected] ~]# /usr/lib/udev/scsi_id -g -u /dev/sdc
36000c2970b50cdffdc8e547c8a87938d
[[email protected] ~]# /usr/lib/udev/scsi_id -g -u /dev/sdd
36000c292f6145f1679dcb64d20c7499e
[[email protected] ~]# /usr/lib/udev/scsi_id -g -u /dev/sde
36000c29c6f447f602411b8adabfe82a9
[[email protected] ~]# /usr/lib/udev/scsi_id -g -u /dev/sdf
36000c29937fecda3c66ce8a02e9a9d9d
[[email protected] ~]# /usr/lib/udev/scsi_id -g -u /dev/sdg
36000c29541e4d4e620c8326c45b51dd4

[[email protected] ~]# multipath -v3

 To configure multipath,wwid  The value of is obtained above  scsi_id,alias  Customizable ,
 Configuration here  3  block  OCR  disc ,2 block DATA disc , A piece of  ARCH  disc .

cp /etc/multipath.conf /etc/multipath.conf.bak

 The initialization configuration file contains the following ：
defaults {
        user_friendly_names yes
        find_multipaths yes
}
blacklist {
}

 The following needs to be in  blacklist  Add a row  devnode  Information 

cat <<EOF>> /etc/multipath.conf
blacklist {
  devnode "^sda"
}

multipaths {
  multipath {
  wwid "36000c29f7e6ca7c54bd3ad4d2a2b8939"
  alias asm_ocr01
  }
  multipath {
  wwid "36000c2970b50cdffdc8e547c8a87938d"
  alias asm_ocr02
  }
  multipath {
  wwid "36000c292f6145f1679dcb64d20c7499e"
  alias asm_ocr03
  }
  multipath {
  wwid "36000c29c6f447f602411b8adabfe82a9"
  alias asm_data01
  }  
  multipath {
  wwid "36000c29937fecda3c66ce8a02e9a9d9d"
  alias asm_data02
  }
  multipath {
  wwid "36000c29541e4d4e620c8326c45b51dd4"
  alias asm_arch01
  }
}
EOF

3 Activate multipath Multipath

multipath -F
multipath -v2

multipath -ll

4 Check the status

systemctl status multipathd.service

5 Boot up service

systemctl enable multipathd.service
[[email protected] ~]# multipath -v3 | grep 3600
[[email protected] ~]# mpathconf