The current protocol selected for system time updates. This field is visible only when the storage system is configured to use a time daemon for time updates. Valid values include:
ntp
SNTP (simple network time protocol) is preferred over rdate for automatic updates because it is the more accurate protocol. See RFC 2030.
rdate
Also known as the TIME protocol, rdate is specified in the RFC 868 standard.
rtc
Time is synchronized to the internal Real-Time Clock chip.