Add GUC full_page_writes to control writing full pages to WAL.

src/backend/utils/misc/postgresql.conf.sample

@@ -121,6 +121,7 @@
 #wal_sync_method = fsync	# the default varies across platforms:
 				# fsync, fdatasync, fsync_writethrough,
 				# open_sync, open_datasync
+#full_page_writes = on		# recover from partial page writes
 #wal_buffers = 8		# min 4, 8KB each
 #commit_delay = 0		# range 0-100000, in microseconds
 #commit_siblings = 5		# range 1-1000