HP StorageWorks 8/40 Brocade Fabric OS Administrator's Guide v6.3.0 (53-100133 - Page 55
Network time protocol, Synchronizing the local time with an external source
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Date and time settings 1 4. At the prompt, select a country location. 5. At the prompt, enter the appropriate number to specify the time zone region or Ctrl-D to quit. Network time protocol 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 SAN 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 will automatically take their time from the principal or primary-FCS switch, as described in "Synchronizing the local time with an external source". All switches in the fabric maintain the current clock server value in non-volatile memory. By default, this value is the local clock server 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. In a Virtual Fabric, all the switches in the fabric must have the same NTP clock server configured. This includes any pre-Fabric OS v6.2.0 switches in the fabric. This ensures that time does not go out of sync in the logical fabric. It is not recommended to have LOCL in the server list. 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. When a switch with v6.1.0 or later enters the fabric it stores the list and the active servers. NOTE In a Virtual Fabric multiple logical switches can share a single chassis. Therefore the NTP server list must be the same across all fabrics. Synchronizing the local time with an external source The tsClockServer command accepts multiple server addresses in either IPv4, IPv6, or 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. 1. Connect to the switch and log in using an account assigned to the admin role. 2. Enter the tsClockServer command: switch:admin> tsclockserver "" where ntp1 is the IP address or DNS name of the first NTP server, which the switch must be able to access. The second ntp2 is the second NTP server and is optional. The operand "" is optional; by default, this value is LOCL, which uses the local clock of the principal or primary switch as the clock server. Example of setting the NTP server switch:admin> tsclockserver LOCL switch:admin> tsclockserver "10.1.2.3" Fabric OS Administrator's Guide 13 53-1001336-01