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2-32 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
NOTE: There is currently no Windows 9x or Windows NT counterpart to the
rdate
command. If you want to use the rdate command, you must have a UNIX worksta-
tion that supports rdate on your filers network.
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You use the rdate command when you need time accuracy only to the second, or
when you want to keep your current method of synchronizing time.
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To keep the filers clock accurate, regularly run the rdate command on the filer with
the target machine, a computer that maintains accurate time and that supports the
port 37 UDP time service. For example, if the name of the target computer is
time_node, enter
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A typical scheme is to have a UNIX computer run a periodic cron job that executes
the appropriate rdate command on your filer through rsh. The computer and the
user (if not root) running the cron job must be in the filers /etc/hosts.equiv file on the
root volume.
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For example, on the UNIX computer named adminhost, the user named adminuser
sets up a cron job to run every day at 3 a.m. It directs the filer named filer to request
a time update from the computer named time_node, which maintains an accurate
time and supports the UDP time service.
crontab entry: The crontab entry on the UNIX system is as follows:
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Entry in /hosts/equiv file: The /etc/hosts.equiv file on filer must contain the follow-
ing line:
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The adminhost and time_node host names must be known to the filer.
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You control how time is synchronized using SNTP and whether time changes are
logged by using the timed options.