lsvg -l vgname得到的是lv的名字，裸设备的话则是rlv*

这是我们在AIX的raw device上创建数据库的命令，你可以参考一下，包括了控制文件，表空间，redo

CREATE DATABASE fwsk
CONTROLFILE REUSE
MAXINSTANCES 32
MAXLOGHISTORY 0
MAXLOGFILES 192
MAXLOGMEMBERS 3
MAXDATAFILES 1024
DATAFILE '/dev/rlvfwsk_system' SIZE 1023M REUSE AUTOEXTEND ON NEXT 10240K MAXSIZE UNLIMITED
EXTENT MANAGEMENT LOCAL
DEFAULT TEMPORARY TABLESPACE TEMP TEMPFILE '/dev/rlvfwsk_temp01' SIZE 10000M REUSE AUTOEXTEND ON NEXT 640K MAXSIZE UNLIMITED
UNDO TABLESPACE "UNDOTBS1" DATAFILE '/dev/rlvfwsk_undotbs1' SIZE 10000M REUSE AUTOEXTEND ON NEXT 5120K MAXSIZE UNLIMITED
CHARACTER SET US7ASCII
NATIONAL CHARACTER SET AL16UTF16
LOGFILE
GROUP 1 ('/dev/rlvfwsk_log11a', '/dev/rlvfwsk_log11b') SIZE 510M reuse,
GROUP 2 ('/dev/rlvfwsk_log12a', '/dev/rlvfwsk_log12b') SIZE 510M reuse,
GROUP 3 ('/dev/rlvfwsk_log13a', '/dev/rlvfwsk_log13b') SIZE 510M reuse,
GROUP 4 ('/dev/rlvfwsk_log14a', '/dev/rlvfwsk_log14b') SIZE 510M reuse;

结论:

创建lv时会同时生成2个设备，一个为字符设备，一个为块设备。
字符设备，C打头，在传输数据时一次传输一个字符，被称为裸设备，空间管理由数据库引擎来完成，而且由于使用的是原始分区避免了空间管理的开销，所以比文件系统在i/o方面更快些。
块设备，B打头，在传输时要经过cache。

再次试验：
# mklv -y 'rawtbs' -t 'raw' oravg 4
rawtbs
# ls -l /dev/*rawtbs*
brw-rw---- 1 root system 35, 17 Jan 14 15:08 /dev/rawtbs
crw-rw---- 1 root system 35, 17 Jan 14 15:08 /dev/rrawtbs
# lslv rawtbs
LOGICAL VOLUME: rawtbs VOLUME GROUP: oravg
LV IDENTIFIER: 005d666a00004c000000010cf7316165.17 PERMISSION: read/write
VG STATE: active/complete LV STATE: closed/syncd
TYPE: raw WRITE VERIFY: off
MAX LPs: 512 PP SIZE: 64 megabyte(s)
COPIES: 1 SCHED POLICY: parallel
LPs: 4 PPs: 4
STALE PPs: 0 BB POLICY: relocatable
INTER-POLICY: minimum RELOCATABLE: yes
INTRA-POLICY: middle UPPER BOUND: 32
MOUNT POINT: N/A LABEL: None
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?: NO

# chmod 775 /dev/rrawtbs
# chown oracle:dba /dev/rrawtbs
# ls -l /dev/*rawtbs*
brw-rw---- 1 root system 35, 17 Jan 14 15:08 /dev/rawtbs
crwxrwxr-x 1 oracle dba 35, 17 Jan 14 15:08 /dev/rrawtbs
# su - oracle
$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.1.0 - Production on Sun Jan 14 15:10:10 2007

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production

SQL> drop tablespace rawtbs including contents and datafiles;
drop tablespace rawtbs including contents and datafiles
*
ERROR at line 1:
ORA-00959: tablespace 'RAWTBS' does not exist


SQL> create tablespace rawtbs
2 datafile '/dev/rrawtbs' size 255m;

Tablespace created.

SQL> exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
$ ls -l /dev/*rawtbs*
brw-rw---- 1 root system 35, 17 Jan 14 15:08 /dev/rawtbs
crwxrwxr-x 1 oracle dba 35, 17 Jan 14 15:11 /dev/rrawtbs
$