HACMP 中Persistent Node IP和Node-Bound Service IP有撒不同

xiaomao2006

如题,望达人指教

xiaomao2006

Assigning a persistent node IP label provides a node-bound address that you can use for administrative purposes, because a connection to a persistent node IP label always goes to a specific node in the cluster. You can have one persistent node IP label per network per node.
As one of HACMP’s best practices, we recommend that you configure a persistent IP label for each cluster node. This is useful, for instance, if you must access a particular node in an HACMP cluster for purposes of running reports or for diagnostics.

看来Persistent Node IP是为管理而存在的,现在的问题是当建立一个service ip是会让我们选择apply to multiple nodes and bound to a  single node,apply to multiple nodes 好理解,问题是bound to a  single node什么情形会用上?

onlybepolite

Persistent IP 虽然在HA里面configure，但在启机的时候就有。
Service IP bound to a single node，只有HACMP启动后才有。往往在需要HA管理resource，但只在一个node上运行某个application的时候才用。很少用到。

[ 本帖最后由 onlybepolite 于 2008-7-29 12:18 编辑 ]

xiaomao2006

只在一个node上运行某个application的时候才用,那不就不是双机了?
有这样的应用吗?

xiaomao2006

http://blog.chinaunix.net/u1/38775/showart_1096083.html,查到答案了
bound to node提供了一个节点上多网卡的冗余,跨节点的则有其他应用软件自己实现

chalylau

jaix

Configurable on multiple nodes :
By default, a service IP label/address may be acquired by multiple nodes, although it will be configured on only one node at any given time.(This address is allowed to participate in IP Address Takeover, either via IP Aliases or via IP Replacement.)
Choosing this option will maintain the Service IP label/address even when the node which currently owns the Service IP label/address fails.

jaix

Bound to a single node :
Select this option to maintain this service IP label/address on the same node at all times. The service IP label/address will be kept highly available as long as there is an active network interface available on this node on the associated network. However, if the node itself fails, or no network interfaces are available, the Service IP label/address will become unavailable.
Note, if this option is selected, and IPAT via IP Aliases is disabled for the network of which this interface is a part, the service IP label/address must also be configured to the AIX 5L operating system (in the CuAt ODM) of the node on which it is to be maintained.

meilixueshan

referenced to ORACLE RAC

onlybepolite

除了RAC，还有个使用的方式，那就是在备份机上运行的测试环境。因为测试环境往往无需failover，所以可以用Node-Bound service IP。这在出persistent IP之前很有用，有了persistent IP之后，不少人就直接用persistent IP了。虽然违背HACMP的使用准则，不过也方便。

顺便提一句，HACMP因为设计的局限性和维护性差的特点，在实际工作中往往只是双机，hot standby的配置，很多的features都用不到。我的看法是对于这些不常用的features，不必深究。