Adding raw devices to Sybase:

First you want to link the raw device you can do this by going to the device path
Do this on the primary and then make sure it is the same on the warm standby if not ask the UNIX team to create some more devices.

Example
/opt/sybase/proj/devices/servername

How to link the files example
ln -s /dev/vx/rdsk/sybdg/servername_datadev15 datadev15

then do the same on the warm standby if it is not already done.
As they need to look the same when creating the new database.

Then do a g and then SQL on both the boxes and create the devices to do this use the disk nit command.
This looks like this

disk init name = 'datadev15',
physname = '/opt/sybase/proj/devices/servername/datadev18',
size = '6144M'
go