Device Time Synchronization; Figure 43 Device Time Synchronization - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Operation Management/Device Monitoring

Device Time Synchronization

The ETERNUS DX treats the time that is specified in the Master CM as the system standard time and distributes
that time to other modules to synchronize the storage time. The ETERNUS DX also supports the time correction
function by using the Network Time Protocol (NTP). The ETERNUS DX corrects the system time by obtaining the
time information from the NTP server during regular time correction.
The ETERNUS DX has a clock function and manages time information of date/time and the time zone (the region
in which the ETERNUS DX is installed). This time information is used for internal logs and for functions such as
Eco-mode, remote copy, and remote support.
The automatic time correction by NTP is recommended to synchronize time in the whole system.
When using the NTP, specify the NTP server or the SNTP server. The ETERNUS DX supports NTP protocol v4. The
time correction mode is Step mode (immediate correction). The time is regularly corrected every three hours
once the NTP is set.
Caution
• If an error occurs in a system that has a different date and time for each device, analyzing the cause of
this error may be difficult.
• Make sure to set the date and time correctly when using Eco-mode.
The stop and start process of the disk motors does not operate according to the Eco-mode schedule if
the date and time in the ETERNUS DX are not correct.
Using NTP to synchronize the time in the ETERNUS DX and the servers is recommended.
Figure 43 Device Time Synchronization
NTP server
NTP
Date and Time
yyyy
Time Zone
GMT
Daylight Saving Time
ETERNUS DX
mm
dd xx:xx:xx
+ 09.00
102 Design Guide