Home
Administering
Learn how to administer the product.
Administering HCL VersionVault MultiSite
Learn to configure and manage the HCL VersionVault MultiSite environment to support development activities at different locations.
Troubleshooting MultiSite operations
When you encounter a situation where running an HCL VersionVault MultiSite command produces an unexpected result, or produces a warning or error message, the information in this section can assist you in troubleshooting the problem.
Synchronization import problems
This section describes problems that can occur during the import phase of synchronization.
Recovering from lost packets
There are several circumstances in which a replica-creation or update packet is generated but is never applied at one or more of its destinations.
Lost update packet
If you have lost an update packet, the state of the replica being updated might not be accurate. You should reset the epoch row in the replica being updated and run the synchronization export from the updating replica again.

Administering
Learn how to administer the product.
- Administering HCL VersionVault
  Learn about performing administrative tasks for an HCL VersionVault community including managing software licenses, user and group accounts, VersionVault server and client hosts, shared data, and the network that connects them.
- Administering platforms for HCL VersionVault
  Learn how to perform HCL VersionVault administrative tasks on supported platforms.
- Administering HCL VersionVault MultiSite
  Learn to configure and manage the HCL VersionVault MultiSite environment to support development activities at different locations.
  - Introduction
    HCL VersionVault MultiSite adds a powerful capability to HCL VersionVault. With MultiSite, developers at different locations can use the same HCL VersionVault versioned object base (VOB). For HCL VersionVault, each location (site) has its own copy (replica) of the VOB. At any time, changes made in one replica can be sent in update packets to other replicas. You can manage replicas by using the command-line tools.
  - MultiSite operation
  - Implementation planning
    Before you install and use HCL VersionVaultHCL Compass MultiSite, you need to plan your implementation.
  - MultiSite command set
    This section summarizes the commands for HCL VersionVault MultiSite and HCL VersionVault that display HCL VersionVault MultiSite information. There are a series of MultiSite commands and API functions that display or modify MultiSite information.
  - Packet transportation methods and configuration
    The method you choose for transporting packets between replicas depends on connectivity. If your replicas do not have IP connectivity, you must use a file-based transport method. If your replicas have connectivity, you can use the store-and-forward facility.
  - Feature levels
    Feature levels allow different replica hosts in a VOB family to run different versions of HCL VersionVault. You can raise the feature level of either a single replica host or an entire VOB family.
  - Creating VOB replicas
    Before creating a replica, you must make decisions about branching, mastership, identities and permissions preservation, and method of packet delivery.
  - Replica synchronization
    Replica synchronization uses the same export-transport-import procedure that is used during replica creation.
  - Administering replicas
  - Using MultiSite for VOB backup and interoperability
    You can use HCL VersionVault MultiSite to back up a VOB and to provide access to VOBs in a heterogeneous network.
  - Troubleshooting MultiSite operations
    When you encounter a situation where running an HCL VersionVault MultiSite command produces an unexpected result, or produces a warning or error message, the information in this section can assist you in troubleshooting the problem.
    - General MultiSite troubleshooting tips
      Many problems can be clarified, if not solved, by examining the various log files, checking your system configuration, and listing the history of exports.
    - Replica export problems
      Common mkreplica –export problems include specifying a new replica name that matches one that already exists or having an old package left over from a previous failed run.
    - Replica import problems
      Common problems encountered while attempting to import an update packet include permissions issues, naming conflicts in the object or tag registry.
    - Synchronization export problems
      Problems encountered while during the export phase of synchronization typically are the result of not being able to find the appropriate oplog entry.
    - Transport problems
      This section describes problems that can occur during the transport phase of synchronization.
    - Synchronization import problems
      This section describes problems that can occur during the import phase of synchronization.
      - Packets accumulate in incoming storage bay
        A recoverable error occurs when an update packet is lost and therefore is not applied to your replica.
      - Packet is not applicable to any local replicas
        A synchronization import can fail when a replica has been moved and the host-name property has not been updated with the chreplica command.
      - Read from input stream fails
        If a packet is corrupted, a syncreplica –import command can fail with an error message about the "read from the input stream" failing.
      - Element changes during operation
        If a syncreplica –import command fails with an error message about the element changing during the operation, try the import operation again.
      - The rmreplica operation cannot be imported
        Import of an rmreplica operation fails if the importing replica records that the removed replica still masters objects.
      - Replica incarnation is old
        Differences in the replica incarnation can prevent syncreplica –import command at the importing replica from completing its operation properly.
      - Warning on receipt of packet from earlier MultiSite version
        Different versions of MultiSite have different packet protocols. When multitool with a newer protocol reads a packet with the older protocol, it prints a warning message.
      - Miscellaneous problems
        There are simple problems (disk space, locked replicas, licensing, multiple processes running) that can cause a packet import to fail.
      - Recovering from lost packets
        There are several circumstances in which a replica-creation or update packet is generated but is never applied at one or more of its destinations.
        Lost replica-creation packet
        If you discover that there is a lost replica-creation packet, you can rename the new replica and then rerun the original mkreplica command.
        Lost update packet
        If you have lost an update packet, the state of the replica being updated might not be accurate. You should reset the epoch row in the replica being updated and run the synchronization export from the updating replica again.
        Method 1: Connected method
        You can use sync_export_list –update or chepoch –actual to set the epoch row to match the actual state of the receiving replica.
        Method 2: lsepoch and chepoch method
        To recover a lost packet, you can use the lsepoch command to determine the receiving replica's epoch number matrix and then use a chepoch command to reset the sending replica's epoch table.
        Method 3: lshistory and chepoch method
        To recover a lost packet, you can use the lshistory command to determine the epoch numbers when the packet was generated and then use a chepoch command to reset the sending replica's epoch table.
        Method 4: lshistory and recoverpacket method
        To recover a lost packet, you can use the lshistory command to determine the time of the last successful import and then use a recoverpacket command to recover all packets since that time.
      - Inconsistent changes to replica
        A recoverable error occurs if syncreplica –import detects that an incoming change is inconsistent with another change that has already been applied to the replica.
      - Automatic renaming of type objects and replica objects
        The syncreplica –import command resolves naming conflicts among type objects or replica objects created at two or more replicas.
    - Running epoch_watchdog
      The epoch_watchdog script checks whether a replica’s epoch numbers have rolled back without a restorereplica command being run.
    - Restoring and replacing VOB replicas
      Occasionally, a VOB storage directory is lost. This can occur because of a hardware failure (for example, disk crash), a software failure (for example, operating system-level file system corruption), or a human error (for example, an rm –fr or del command). If an unreplicated VOB storage directory is lost, you can restore a recent copy from backup and resume development work. The changes made between the time of the backup and the time of the failure are not recoverable.
    - Restoring replica storage that has been accidentally deleted
      This is the process to follow when a replica's storage directory is lost, and there is no backup to be restored.

Lost update packet

If you have lost an update packet, the state of the replica being updated might not be accurate. You should reset the epoch row in the replica being updated and run the synchronization export from the updating replica again.

The syncreplica –export command assumes successful delivery of the update packet it generates. For example, when replica boston_hub sends an update to replica sanfran_hub, the syncreplica command assumes that the operations originating at boston_hub are imported to the sanfran_hub replica. For simplicity, this example does not reflect the fact that the update packet can also contain operations that originated at other replicas in the VOB family.

But, if the packet is lost, this assumption is invalid, and boston_hub must reset its estimate of the state of replica sanfran_hub by resetting the epoch row. After this correction is made, the next update packet sent from boston_hub to sanfran_hub contains the operations sanfran_hub needs.

To reset the epoch row to match the actual state of the receiving replica, use one of the methods described here.

Note: If there are no saved epoch rows for the receiving replica that are as old as the time specified, you must use one of the chepoch procedures.

Have feedback?
Google Analytics is used to store comments and ratings. To provide a comment or rating for a topic, click Accept All Cookies or Allow All in Cookie Preferences in the footer of this page.