Windows Storage Pool stuck at "Starting, OK" after rebooting for patches
Please verfiy that after the update if any other changes made on the paths to the storage Switches. Also verify that OS level changes you made are still compatible with code level on the XIV. https://www-03.ibm.com/systems/support/storage/ssic/interoperability.wss
Also update to the lastest XIV HAK https://www.ibm.com/support/knowledgecenter/STZSWD_11.5.4/hsg/hsg_hak_kcwelcome_xsa.html
Also review documentation on this site that may assist https://www.ibm.com/support/knowledgecenter/STJTAG/landing/xiv_kcwelcomepage.html