HACMP 5.2中资源组策略简介

Document #: 2811025B28000

Body:
[标题]HACMP 5.2中资源组策略简介

内容提要:
随着HACMP 5.2 的发布，在用户定义资源组的特性时有了更多的选择，更加灵活了。这主要表现在定义资源组时, 通过为资源组设置 Startup, Fallover 和 Fallback 使用策略，使其满足不同用户的实际需求。

说明:

HACMP 5.2 中资源组策略简介

HACMP 的配置中，资源组的定义是非常重要的一部分。
随着HACMP 5.2 的发布，在用户定义资源组的特性时有了更多的选择，更加灵活了。这主要表现在定义资源组时, 通过为资源组设置 Startup, Fallover 和 Fallback 使用策略，使其满足不同用户的实际需求。
HACMP 5.2 中，定义资源组的过程包括两部分：
1 ． 为资源组设置Startup, Fallover 和 Fallback 使用策略。
2 ． 向资源组中添加各类资源。
另外 HACMP 5.2 中不再支持之前版本中，系统预定义的资源组 - - 即没有了cascading, rotating 或 concurrent 资源组这样的说法，所有的资源组的策略都是可客户化定义的。但可通过为资源组配置不同的策略，使其表现出与以前版本中预定义资源组一样的特性。

在 HACMP 5.2 中 Startup, Fallover 和 Fallback 可使用的策略见下表：

Startup	可设置的策略有： • Online on Home Node Only. The resource group should be brought online only on its home (highest priority) node during the resource group startup. This requires the highest priority node to be available. • Online on First Available Node. The resource group activates on the first participating node that becomes available. • Online on All Available Nodes. The resource group is brought online on all nodes. • Online Using Distribution Policy. Only one resource group is brought online on a node, or on a node per network, depending on the distribution policy specified (node or network).
Fallover	可设置的策略有 • Fallover to Next Priority Node in the List. In the case of fallover, the resource group that is online on only one node at a time follows the default node priority order specified in the resource group’s nodelist. • Fallover Using Dynamic Node Priority. Before selecting this option, configure a dynamic node priority policy that you want to use. Or you can select one of the three predefined dynamic node priority policies. • Bring Offline (on Error Node Only). Select this option to bring a resource group offline on a node during an error condition.
Fallback	可设置的策略有 • Fallback to Higher Priority Node in the List. A resource group falls back when a higher priority node joins the cluster. If you select this option, you can use the delayed fallback timer. If you do not configure a delayed fallback policy, the resource group falls back immediately when a higher priority node joins the cluster. • Never Fallback . A resource group does not fall back when a higher priority node joins the cluster.


HACMP5.2 会对Startup, Fallover ,Fallback 使用规则进行有效性检查， 其只支持有效Startup, Fallover ,Fallback 组合的资源组。
在 HACMP 5.2 中 有效的 Starup, Fallover , Fallback 组合是 ：

当 Startup 使用策略	Fallover 可使用的策略是	Fallback 可使用策略是
Online only on home node for The resource group	以下任何一种: • Fallover to next priority node in the list • Fallover using Dynamic Node Priority • Bring offline (on error	以下任何一种: • Never fall back • Fall back to higher priority node in the list
Online using distribution policy	以下任何一种:: • Fallover to next priority node in the list • Fallover using Dynamic Node Priority	以下任何一种: • Never fall back
Online on first available node	以下任何一种:: • Fallover to next priority node in the list • Fallover using Dynamic Node Priority • Bring offline (on error node only )	以下任何一种: • Never fall back • Fall back to higher priority node in the list
Online on all available nodes	Bring offline (on error node only)	以下任何一种: • Never fall back • Fall back to higher priority node in the list


若进行HACMP 升级操作，请参照下表来进行资源组的设置。 从而了解如何将系统预定义资源组 -- cascading , rotating 和 concurrent 移植到 HACMP 5.2 中，其对应关系为：

在 HACMP5.2 以前资源组的定义	在 HACMP5.2 中资源组的定义
Cascading resource group Inactive Takeover = False Cascading without Fallback (CWOF) = False	• Startup: Online on Home Node Only • Fallover: Fallover to Next Priority Node in the List • Fallback: Fallback to Higher Priority Node in the List
Cascading resource group Inactive Takeover = True CWOF = False	• Startup: Online on First Available Node Fallover: Fallover to Next Priority Node in the List • Fallback: Fallback to Higher Priority Node in the List
Cascading resource group Inactive Takeover = False CWOF = True	• Startup: Online on Home Node Only • Fallover: Fallover to Next Priority Node in the List • Fallback: Never Fallback
Cascading resource group Inactive Takeover = True CWOF = True	• Startup: Online on Fisrt Available Node • Fallover: Fallover to Next Priority Node in the List • Fallback: Never Fallback
Rotating resource group	.Startup: Online Using Distribution Policy • Resource Group Distribution Policy: Network distribution • Fallover: Next Priority Node in the List • Fallback: Never Fallback
Concurrent resource group	• Startup: Online on All Available Nodes • Fallover: Bring Offline (On Error Node Only) • Fallback: Never Fallback


还可为资源组设置的属性包括：Settling Time, Dynamic Node Priority 和 Fallback Timer ，以及资源组在节点间的分配策略。进一步满足用户对不同应用使用不同测略的需要。