How to patch an exadata (part 4) - the rollback procedure

4: The Rollback Procedure

4.1 - Cell Rollback

• Check the version cells will be rolled back to and the flashCacheMode setting with the following commands :

[root@myclusterdb01 ~]# dcli -l root -g cell_group imageinfo -ver -inactive
 [root@myclusterdb01 ~]# dcli -l root -g cell_group cellcli -e 'list cell attributes flashCacheMode'
 

• Check the prerequisites using the following command:

[root@myclusterdb01 ~]# ./patchmgr -cells cell_group -rollback_check_prereq -rolling
 [root@myclusterdb01 ~]# ./patchmgr -cells cell_group -rollback -rolling
 

• Clean up the cells using the -cleanup option to clean up all the temporary update or rollback files on the cells. This option cleans the stale update and rollback states as well as cleaning up to 1.5 GB of disk space on the cells. Use this option before retrying a halted or failed run of the patchmgr utility :

[root@myclusterdb01 ~]# ./patchmgr -cells cell_group -cleanup
 

4.2 - DB nodes Rollback

• Check the version of each DB node before the rollback :

[root@myclusterdb01 ~]# dcli -g ~/dbs_group -l root imageinfo -ver
 

• Umount the NFS :

df -t nfs | awk '{if ($NF ~ /^\//){print "umount " $NF}}'
 

• Rollback the patch (launch it from the cel01 server) :

[root@myclustercel01 ~]# cd /tmp/dbserver_patch_5.161110
 [root@myclustercel01 dbserver_patch_5.161110]# ./patchmgr -dbnodes ~/dbs_group -rollback -iso_repo /tmp/p24669306_121233_Linux-x86-64.zip -target_version <previous the='' of='' version='' installed='' patch=''> -rolling
 

• Check the version of each DB node after the rollback:

[root@myclusterdb01 ~]# dcli -g ~/dbs_group -l root imageinfo -ver
 

4.3 - IB Switches Rollback

• Check the current version installed on the IB switches :

[root@myclusterdb01 ~]# dcli -g ~/ib_group -l root version | grep -i version
 

[root@myclusterdb01 ~]# cd /patches/OCT2016_bundle_patch/24436624/Infrastructure/12.1.2.3.3/ExadataStorageServer_InfiniBandSwitch/patch_12.1.2.3.3.161013/
 [root@myclusterdb01 ~]# ./patchmgr -ibswitches ~/ib_group -downgrade -ibswitch_precheck
 [root@myclusterdb01 ~]# ./patchmgr -ibswitches ~/ib_group -downgrade
 

• Check the versions on the IB switches after the rollback:

[root@myclusterdb01 ~]# dcli -g ~/ib_group -l root version | grep -i version