Suppose I have a raw device said created like on CentOS with sybase 12.5:
DISK INIT
NAME='mydevice',
PHYSNAME='/dev/raw/raw1',
VDEVNO=5,
SIZE='1024000',
VSTART=0,
CNTRLTYPE=0,
DSYNC=FALSE
go

then I install scripts for dbextend. then It is possible to set this set device as autoextend like:

sp_dbextend 'set', 'device', 'mydevice', '10%'

Or

sp_dbextend 'set', 'device', 'mydevice', '1G'

Question is: if this raw device can be extended, how can I extended manually? If it is 1G, how can I extend it to 2G manually?