6.19 Creating the UDL and UDL Entries for TLOG

You must manually create a UDL entry for the TLOGDEVICE on each machine where a TLOG is needed. You may create these entries either before or after you have loaded TUXCONFIG, but you must create these entries before booting the application.

To access the create device list command, crdl, you invoke tmadmin -c with the application inactive. The -c option invokes tmadmin in configuration mode.

To create the UDL and a UDL entry for TLOG on each machine in your application that use global transactions, follow these steps:

1. Log in as the application administrator on the MASTER machine.
2. Enter the following command:

   
   tmadmin -c 
   crdl -z config -b blocks

   Here -z config specifies the full pathname of the device on which the UDL should be created (that is, where the TLOG resides), and -b blocks specifies the number of blocks to be allocated on the device. The value of config should match the value of the TLOGDEVICE parameter in the MACHINES section of the UBBCONFIG file. The blocks must be larger than the value of TLOGSIZE. If -z is not specified, the value of config defaults to the value of the FSCONFIG environment variable.

3. Log in as the application administrator on each remaining non-MASTER machine that uses global transactions and repeat step 2.

If the TLOGDEVICE is mirrored between two machines, step 3 is not required on the paired machine. To be recoverable, the TLOG should reside on a device that can be mirrored.