IBM FC5022, User Manual

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Introduction 31
Setting date and time
2
Local time synchronization
You can synchronize the local time of the principal or primary fabric configuration server (FCS)
switch to a maximum of eight external Network Time Protocol (NTP) servers. To keep the time in
your switch current, it is recommended that the principal or primary FCS switch has its time
synchronized with at least one external NTP server. The other switches in the fabric automatically
take their time from the principal or primary FCS switch.
All switches in the fabric maintain the current clock server value in nonvolatile memory. By default,
this value is the local clock server <LOCL> of the principal or primary FCS switch. Changes to the
clock server value on the principal or primary FCS switch are propagated to all switches in the
fabric.
When a new switch enters the fabric, the time server daemon of the principal or primary FCS switch
sends out the addresses of all existing clock servers and the time to the new switch. If a switch with
v5.3.0 or later has entered the fabric, it will be able to store the list and the active servers;
pre-5.3.0 Fabric OS switches will ignore the new list parameter in the payload and will update only
the active server address.
If the active NTP server configured is IPv6, then distributing the same information in the fabric will
not be possible to switches earlier than v5.3.0 because IPv6 is supported for Fabric OS version
5.3.0 and later. The default value LOCL will be distributed to pre-5.3.0 switches.
The tsClockServer command accepts multiple server addresses in IPv4, IPv6, or Domain Name
System (DNS) name formats. When multiple NTP server addresses are passed, tsClockServer sets
the first obtainable address as the active NTP server. The rest are stored as backup servers that
can take over if the active NTP server fails. The principal or primary FCS switch synchronizes its
time with the NTP server every 64 seconds.
Setting the date
1. Log in using the following default username and password settings:
User ID: USERID

Password: PASSW0RD (wherein the sixth character is a zero)
2. Enter the date command, using the following syntax (the double quotation marks are required):
date "mmddHHMMyy"
The following values are used in the syntax:
•
mm is the month; valid values are 01 through 12.
•
dd is the date; valid values are 01 through 31.
•
HH is the hour; valid values are 00 through 23.
•
MM is minutes; valid values are 00 through 59.
•
yy is the year; valid values are 00 through 99 (values greater than 69 are interpreted as
1970 through 1999, and values less than 70 are interpreted as 2000 through 2069).
switch:admin> date
Fri Sep 29 17:01:48 UTC 2007
switch:admin> date "0927123007"
Thu Sep 27 12:30:00 UTC 2007