MSCS+iSCSI 策略选择问题？

ydhu

配置两台win2003做集群，原来没有做集群的时候可以在iSCSI设置路径策略，比如failover或者Round Robin但做了集群后，只能设置failover。查阅微软文档，出现如下内容。
On Windows 2003, all other load balance policies are supported if the iSCSI target supports SCSI PERSISTENT RESERVE and PERSISTENT RELEASE and the persistent reserve key is established on all nodes of the cluster. To configure the persistent reservation key for your cluster, you need to assign 8 byte keys to all nodes in the cluster. Pick a 6 byte value that is specific to that cluster and a different 2 byte values for each node in the cluster.  The cluster specific value should be different for different clusters on your SAN to protect a cluster from using the wrong storage device.


To configure the persistent reservation key for your cluster:
1.        Select a 16-byte value that is unique to that cluster.
2.        Locate the following registry key:
HKLM\System\CurrentControlSet\Services\MSiSCDSM\PersistentReservation
3.        Add the following values:
a.        UsePersistentReservation        REG_DWORD                1
Setting this value to 1 enables Persistent Reservation.
b.        PersistentReservationKey        REG_BINARY                <PR key>
This is a 16-byte binary value that is unique to the cluster. The same binary value must be used on all nodes in the cluster.
Note:        These registry values must be added to all nodes in the cluster.

<PR Key> is an 8 byte binary value that is composed of a 6 byte part that is specific to the cluster and a 2 byte part that is specific to the node. For example if you have a three node cluster you could assign 0xaabbccccbbaa as the cluster specific part. The nodes could then have the following PR keys:

Node 1: 0xaabbccccbbaa0001
Node 2: 0xaabbccccbbaa0002
Node 3: 0xaabbccccbbaa0003

但修改注册表重启后依然无法修改路径策略，请高手指点，谢谢！

ydhu

不会吧 没有知道？

阿拉丁神灯

弱弱的问一下：failover和round robin有什么区别？