依照慣例,由您宣告 RTR 檔案中跟隨資源類型特性的資源特性。資源特性包含由 Sun Cluster 提供的系統定義的特性以及您定義的延伸特性。對於兩者中任一種類型,您都可以指定一些由 Sun Cluster 提供的特性性質,如最小值、最大值和預設值。
以下清單將顯示 RTR 檔案範例中系統定義的特性。
# A list of bracketed resource property declarations follows the # resource type declarations. The property-name declaration must be # the first attribute after the open curly bracket of each entry. # The <method>_timeout properties set the value in seconds after which # the RGM concludes invocation of the method has failed. # The MIN value for all method timeouts is set to 60 seconds. This # prevents administrators from setting shorter timeouts, which do not # improve switchover/failover performance, and can lead to undesired # RGM actions (false failovers, node reboot, or moving the resource group # to ERROR_STOP_FAILED state, requiring operator intervention). Setting # too-short method timeouts leads to a *decrease* in overall availability # of the data service. { PROPERTY = Start_timeout; MIN=60; DEFAULT=300; } { PROPERTY = Stop_timeout; MIN=60; DEFAULT=300; } { PROPERTY = Validate_timeout; MIN=60; DEFAULT=300; } { PROPERTY = Update_timeout; MIN=60; DEFAULT=300; } { PROPERTY = Monitor_Start_timeout; MIN=60; DEFAULT=300; } { PROPERTY = Monitor_Stop_timeout; MIN=60; DEFAULT=300; } { PROPERTY = Thorough_Probe_Interval; MIN=1; MAX=3600; DEFAULT=60; TUNABLE = ANYTIME; } # The number of retries to be done within a certain period before concluding # that the application cannot be successfully started on this node. { PROPERTY = Retry_Count; MIN=0; MAX=10; DEFAULT=2; TUNABLE = ANYTIME; } # Set Retry_Interval as a multiple of 60 since it is converted from seconds # to minutes, rounding up. For example, a value of 50 (seconds) # is converted to 1 minute. Use this property to time the number of # retries (Retry_Count). { PROPERTY = Retry_Interval; MIN=60; MAX=3600; DEFAULT=300; TUNABLE = ANYTIME; } { PROPERTY = Network_resources_used; TUNABLE = AT_CREATION; DEFAULT = ““; }
儘管 Sun Cluster 提供系統定義的特性,但您可以使用資源特性性質來設定不同的預設值。請參閱資源特性性質,以取得可套用至資源特性的性質之完整清單。
Sun Cluster 為所有逾時提供最小值 (1 秒) 與預設值 (3600 秒)。RTR 檔案範例會將最小值變更為 60 秒,而將預設值變更為 300 秒。叢集管理員可以接受此預設值,或將逾時值變更為其他值 (60 或更高的值)。Sun Cluster 不具有最大的允許值。
Thorough_Probe_Interval、Retry_count 以及 Retry_interval 特性將 TUNABLE 性質設定為 ANYTIME。此設定意味著叢集管理員可以變更這些特性的值,即使資料服務正在執行。透過資料服務範例實施的故障監視器將使用這些特性。當透過管理動作變更這些或其他資源特性時,資料服務範例將實施 Update 方法來停止與重新啟動故障監視器。請參閱Update 方法。
資源特性分為
必需 — 叢集管理員必須在建立資源時指定一個值;
可選用 — 如果管理員未指定值,則系統會提供一個預設值。
條件式 — 只有在 RTR 檔案中宣告了特性,RGM 才會建立該特性。
資料服務範例的故障監視器將使用 Thorough_probe_interval、Retry_count、Retry_interval 和 Network_resources_used 條件式特性,因此開發人員需要在 RTR 檔案中宣告它們。請參閱 r_properties(5) 線上說明手冊或資源特性,以取得有關如何將特性分類的資訊。
# Extension Properties # The cluster administrator must set the value of this property to point to the # directory that contains the configuration files used by the application. # For this application, DNS, specify the path of the DNS configuration file on # PXFS (typically named.conf). { PROPERTY = Confdir; EXTENSION; STRING; TUNABLE = AT_CREATION; DESCRIPTION = “The Configuration Directory Path”; } # Time out value in seconds before declaring the probe as failed. { PROPERTY = Probe_timeout; EXTENSION; INT; DEFAULT = 120; TUNABLE = ANYTIME; DESCRIPTION = “Time out value for the probe (seconds)”; }
RTR 檔案範例定義 Confdir 與 Probe_timeout 兩個延伸特性。Confdir 指定 DNS 配置目錄的路徑。此目錄包含 in.named 檔案,DNS 需要此檔案才能成功執行。資料服務範例的 Start 方法與 Validate 方法都將使用此特性,以驗證在啟動 DNS 之前配置目錄與 in.named 檔案是否均可存取。
配置資料服務時,Validate 方法將驗證新目錄是否可存取。
資料服務範例的 PROBE 方法不是 Sun Cluster 回呼方法,而是使用者定義的方法。因此,Sun Cluster 不為其提供 Probe_timeout 特性。開發者已在 RTR 檔案中定義了延伸特性,以允許叢集管理員配置 Probe_timeout 值。