Storage Area Networks (SAN)

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  • 1.  SVC (Failed to synchronize cluster time to NTP server)

    Posted Mon October 31, 2022 02:14 PM
    Hello,
    our environment is:
    SAN Volume Controller Ver. 8.5.0.5 with 6 nodes.
    Since for 5 days an error is reported: Failed to synchronize cluster time to NTP server # Error Code = 2700

    We check the availability of the NTP server, no issue also for testing with try another NTP IP server and same error.
    SMTP email work without issue.

    I have read to do a manual failover config node. When that happens the new config node will bind the Management cluster IP address to the new config node and should resolve the issue.

    Anybody have this type of issue with SVC and NTP service?

    What I'm thinking to try before made the failover of config node is simply change the cluster management IP address and then put it back the original IP address. Doing this will force an interface bind and refresh the routing decision.

    As a last resort I will open a ticket at IBM.

    Reference documentation at IBM:

    Routing considerations for event notification and Network Time Protocol

    The system supports the following protocols that make outbound connections:

    • Email
    • Simple Network Mail Protocol (SNMP)
    • Syslog
    • Network Time Protocol (NTP)

    These protocols operate only on a port that is configured with a management IP address. When it is making outbound connections, the system uses the following routing decisions:

    • If the destination IP address is in the same subnet as one of the management IP addresses, the system sends the packet immediately.
    • If the destination IP address is not in the same subnet as either of the management IP addresses, the system sends the packet to the default gateway for Ethernet port 1.
    • If the destination IP address is not in the same subnet as either of the management IP addresses and Ethernet port 1 is not connected to the Ethernet network, the system sends the packet to the default gateway for Ethernet port 2.

    When you configure any of these protocols for event notifications, use these routing decisions to ensure that error notification works correctly if the network fails.

    If you have any solution path let me know.

    Yves









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    Yves Blackburn
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  • 2.  RE: SVC (Failed to synchronize cluster time to NTP server)

    Posted Tue November 01, 2022 11:21 AM
    Hi Yves,

    I have seen this happen when the NTP server is Windows based, it seems to work fine with Linux based NTP servers, I have (years ago) asked why, but never got a reply on this.  However if your NTP server(s) are Windows based, try a Linux based NTP server at least for testing.

    /John

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    John Mortensen
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  • 3.  RE: SVC (Failed to synchronize cluster time to NTP server)

    Posted Tue November 01, 2022 01:25 PM
    Hi John,
    The problem just disappeared after I save a dummy IP for the NTP server, wait about 5-10 minutes and then put back the right NTP IP address. Then after that no more "Failed to synchronize cluster time to NTP server" Our NTP sever is a NTP server in cloud behind a network load balancer. For the moment the issue is solved.

    Yves

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    Yves Blackburn
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