HP NonStop G-Series - Manual (Page 21)

ServerNet Nomadic Disk Overview
ServerNet Nomadic Disk User’s Guide— 425485-001
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Logically Switching a Database
Logically Switching a Database
While a physical switch changes the connection of a device from one node to another
node, a logical switch allows the backup node to access a database after a physical
switch occurs. Logical switching fixes naming inconsistencies that arise when a
database is moved to a node with a different node name and node number.
Supported Database Products
Enscribe contains features that support logical switching. Before performing a logical
switch, review the following consideration:
Enscribe alternate-key files that reside on a Nomadic volume must not be created with a
node specified as in this example:
> FUP ALTER $DATA.B.C, ALTFILE (0,\ABC.$DATA.B.C0)
Before switching a Nomadic volume to a backup node for the first time, change the
Enscribe alternate-key file so that a node name is not specified. For example:
> FUP ALTER $DATA.B.C, ALTFILE (0,$DATA.B.C0)
For more information about the Enscribe environment, refer to the Enscribe
Programmer’s Guide.
Unsupported Database Products
The following are not supported by the ServerNet Nomadic Disk subsystem:
•
NonStop Transaction Manager/MP (TM/MP)
•
Compaq NonStop SQL/MP and products that depend on it such as distributed
systems management (DSM)/Tape Catalog and distributed systems
management/software configuration manager (DSM/SCM)
•
Open System Services (OSS)
•
Storage Management Foundation (SMF)