Dependencies and Conditions of dataserver -b and -w Options

The effect of -b changes depending on whether -w is present.

-b without -w creates a new master device as named by -d (the default is d_master) and with the page size as specified by -z (the default is 2048). If the named device:
- Already exists as an OS file – the attempt fails, and you see a message such as:
```
File already exists. You must remove the existing 
file before attempting to create a new one using 
the server's -b option.
Unable to create master device.
```
- Names an existing raw partition – the attempt fails unless you include the-f flag. This reinitializes the raw partition as a server master device.
-b with -w master tells dataserver to use the size specified in -z for the master device when re-creating the master database. It implies nothing about creating a new device.

-w may or may not require additional flags if you use:

-w model – the -z and -b flags are accepted but ignored.
-w master for new installations – -z and -b are not required because the device size information is stored in the config_block.
-w master to upgrade older installations:
- The server requires -b and/or -z if the config_block does not contain a valid entry for the associated size(s). The command fails if it cannot get valid data for the page size or device size.
- Provide -b and/or -z when the config_block contains valid entries for the sizes they represent. However if the sizes do not match what is in the config_block, add -f to force your new size preferences.