oracle11gR2 ASM存储参数问题

最近在oracle官方文档上看到这一段话：
To enable simultaneous access to a disk device from multiple nodes, you must set the appropriate Object Data Manager (ODM) attribute, depending on the type of reserve attribute used by your disks. The following section describes how to perform this task using hdisk logical names. Refer to your operating system documentation to find logical device names.

To determine the reserve setting your disks use, enter the following command, where n is the hdisk device number:

# lsattr -E -l hdiskn | grep reserve_
The response is either a reserve_lock setting, or a reserve_policy setting. If the attribute is reserve_lock, then ensure that the setting is reserve_lock = no. If the attribute is reserve_policy, then ensure that the setting is reserve_policy = no_reserve.

If necessary, change the setting with the chdev command using the following syntax, where n is the hdisk device number:

chdev -l hdiskn -a [ reserve_lock=no | reserve_policy=no_reserve ]
For example, to change a setting for the device hdisk4 from reserve_lock=yes to reserve_lock=no, enter the following command:

# chdev -l hdisk4  -a  reserve_lock=no

请问：
1、这个参数设置是在什么情况下需要设置啊，是仅针对于AIX中使用ASM安装oracle RAC环境下才需要设置吗？
2、这个参数是针对哪些厂商的存储才要这样设置？
3、是不是oracle10或11 版本中，只要使用ASM来安装RAC的，都需要设置这个参数啊？
3、AIX下安装oracle11gR2以前版本，不使用ASM 安装RAC，是否需要设置这个参数呢?
4、除了AIX系统，其他的UNIX、Linux系统在使用ASM或非ASM 安装oracle RAC下，是否需要关注这个参数啊？

麻烦大家 有空的话解答下啊，谢谢~！

1.只针对AIX下,只要用来并发就需要设置,用ASM也需要,用HA做并发VG也需要
2. 不同的存储厂商,设置不一样,如:IBM存储（ESS DSXXX），chdev -l hdisk* -a reserve_policy=no_reserve
EMC 存储，chdev -l hdisk*(powerhdisk*) -a reserver_lock=no
HDS存储使用HDLM driver，chdev -l dlmfdrv* -a dlmsvlevel=no_reserve
3.和1问题一样
4.和3一样
4.和1一样

啊，感谢啊，小弟明白了

对了，我看论坛以前有人回答过，说：
在HACMP中创建Enhanced Concurrent VG 就不需要理会这个参数，这是怎么回事呢？

http://www.loveunix.net/redirect ... post&styleid=22

还有人看看没啊