Sun Cluster 資料服務開發者指南 (適用於 Solaris 作業系統)

RTR 檔案範例中的資源特性

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。

RTR 檔案中系統定義的特性

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。

請注意以下有關 RTR 檔案範例中系統定義資源特性的資訊。

RTR 檔案中的延伸特性

RTR 檔案範例的末尾為延伸特性,如以下清單中所示

# 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 ConfdirProbe_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。