add raw device for oracle 10g r2

[guan_1]

Hi,we have a problem,a tablesapce has not enough spaces.I want to add a datafile,but the tablespace be created on raw device.
How to add a datafile for oralce on raw device?
THX!!!
software:
HP-UX 11i V3 ia 64
ORACLE 10.2.0.4.0
MC/cluster service guard

PS:
VG info:
--- Volume groups ---
VG Name /dev/VG_QDB_ORA02
VG Write Access read/write
VG Status available, exclusive
Max LV 511
Cur LV 61
Open LV 61
Max PV 511
Cur PV 1
Act PV 1
Max PE per PV 65536
VGDA 2
PE Size (Mbytes) 32
Total PE 31999
Alloc PE 31504
Free PE 495
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
VG Version 2.0
VG Max Size 2t
VG Max Extents 65536

SIZE: 31504*32/1024=984.5GB

DATAFILE info:
select sum(bytes/1024/1024/1024) as datafile_GB
from v$datafile
where name like '/dev/VG_QDB_ORA02/%'

SIZE: 881.5234375GB

[klb]

At a high level and with no consideration to SG and other cluster constraints:

8GB addition...
lvcreate -L 8192M -n lv_new VG_QDB_ORA02
chown oracle: /dev/VG_QDB_ORA02/rlv_new

... then in oracle ...

alter tablespace add datafile
'/dev/VG_QDB_ORA02/rlv_new' size 8192M;
-- may need to decrease the size here by 4k or so.

Have a look at your current datafiles and duplicate what you see there in terms of naming and placement ( Oracle may be using links to the raw device file ):

select file_name from dba_data_files;

Hth,

-klb