 WWID=360050768028c8449c00000000000024e , sg devices= /dev/sg11 /dev/sg15  /dev/sg19 /dev/sg23 /dev/sg27 /dev/sg31 /dev/sg35 /dev/sg39 WARNING: More than one local sg devices are configured with WWID  360050768028c8449c00000000000024e on node itso-sles12-powerha-n-1, it is  a d v i s e d n o t t o u s e a n y o f t he specified disks for any other application as in case of a cluster split,  tiebreaker will reserve the disk and all writes to the disk will start failing.  WWID=360050768028c8449c00000000000024e , sg devices= /dev/sg12 /dev/sg16  /dev/sg20 /dev/sg24 /dev/sg28 /dev/sg32 /dev/sg36 /dev/sg40 Successfully added DISK tiebreaker. itso-sles12-powerha-n-1 :~ # clmgr list cluster CLUSTER_NAME="itsoclPHA" CLUSTER_ID="1542451814" STATE="ONLINE" VERSION="7.2.2.1" OSNAME="Linux" SPLIT_POLICY=" TieBreaker " TIE_BREAKER="DISK" NFS_SERVER="" NFS_LOCAL_MOUNT_POINT="" NFS_SERVER_MOUNT_POINT="" NFS_FILE_NAME="" DISK_WWID="WWID= 360050768028c8449c00000000000024e " itso-sles12-powerha-n-2: ~ # clmgr list cluster CLUSTER_NAME="itsoclPHA" CLUSTER_ID="1542451814" STATE="ONLINE" VERSION="7.2.2.1" OSNAME="Linux" SPLIT_POLICY=" TieBreaker " TIE_BREAKER="DISK" NFS_SERVER="" NFS_LOCAL_MOUNT_POINT="" NFS_SERVER_MOUNT_POINT="" NFS_FILE_NAME="" DISK_WWID="WWID= 360050768028c8449c00000000000024e " itso-sles12-powerha-n-2:~ # 25.Now, the addition of the disk is validated in both nodes. You can see that the  SPLIT_POLICY  policy changed to  TieBreaker  as shown in Example 11-40. 26.Before you configure a file system, verify that disk is shared between the relevant nodes of  cluster. File system resources cannot be added into the RG, which has some nodes in the  node list where the disk of that file system is not shared. You can check the shared disk by  using the  multipath -ll  command or the  lsrsrc -Ab IBM.Disk  command. 27.Create a partition on the shared disk by using the  fdisk /dev/<device>  command, as  shown in Example 11-41. itso-sles12-powerha-n-1 :/dev/mapper #  fdisk /dev/mapper/DATA2 Welcome to fdisk (util-linux 2.29.2). Changes will remain in memory only, until you decide to write them. Example 11-41 Using the fdisk command to partition the disk Example 11-40 Validating the addition of the heartbeat disk to the PowerHA cluster 450  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux