 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. 

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. 

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:~ # 

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. 

