diff --git a/lib/mysql-common.sh b/lib/mysql-common.sh
index 347e50a..8048b45 100755
--- a/lib/mysql-common.sh
+++ b/lib/mysql-common.sh
@@ -294,16 +294,34 @@ check_mysql_health() {
 
             # Only check write capability if we're master
             if [ "$CURRENT_ROLE" = "master" ]; then
-                # Get read_only status for debugging
-                local read_only_status
-                read_only_status=$(mysql_retry -e 'SHOW VARIABLES LIKE "read_only"' 2>/dev/null)
+                # Get detailed MySQL variables for debugging
+                local mysql_vars
+                mysql_vars=$(mysql_retry -e "SHOW VARIABLES LIKE '%read_only%'\G")
+                local super_read_only
+                super_read_only=$(mysql_retry -e "SELECT @@global.super_read_only")
+                local current_user
+                current_user=$(mysql_retry -e "SELECT CURRENT_USER()")
+                local grants
+                grants=$(mysql_retry -e "SHOW GRANTS")
                 
-                if ! mysql_retry -e 'CREATE TABLE IF NOT EXISTS mysql.role_check (id INT); DROP TABLE mysql.role_check;' >/dev/null 2>&1; then
+                log_info "MySQL variables before write test:"
+                log_info "Read only settings: ${mysql_vars}"
+                log_info "Super read only: ${super_read_only}"
+                log_info "Current user: ${current_user}"
+                log_info "Grants: ${grants}"
+                
+                # Try to create test table with error capture
+                if ! error_output=$(mysql_retry -e 'CREATE TABLE IF NOT EXISTS mysql.role_check (id INT); DROP TABLE mysql.role_check;' 2>&1); then
                     status_details+=("write:failed")
-                    log_error "MySQL cannot execute DDL (read_only status: ${read_only_status})"
+                    log_error "MySQL cannot execute DDL"
+                    log_error "Error output: ${error_output}"
+                    log_error "Variables: ${mysql_vars}"
+                    log_error "Super read only: ${super_read_only}"
+                    log_error "Current user: ${current_user}"
                     errors=$((errors + 1))
                 else
                     status_details+=("write:ok")
+                    log_info "Write test successful"
                 fi
             else
                 status_details+=("write:skipped")