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A resource group is a set of resources and MCCS failover the entire resources in a group when failure is occurred. 
MCCS performs failover of nodes on a group basis. Thus, you need to group the resources in the unit of failover.In addition, within a cluster, you can create multiple groups.


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Group attribute can be identified from Group Attributes view and Group State view.
From the group management view of MCCS web console, select group, then select the ‘Group Attributes’ tab located on right top of detailed information panel.
The values of gray colored are for read only. They just contain and show the information of group state.
The values of white colored are configurable by user definition

Image RemovedImage Added

[Figure] Group Attribute View

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AttributeDescriptionTypeDefaultEditNote
ActionState

It represents the action status for the ongoing group.
Resource online in progress: STARTING
Resource offline in progress: STOPPING
Online/offline: WATCHING

STRING
XAutoDisabled

Automatically disabled.
If a engine is being operated or monitoring of the resources in a group is not finished, it cannot guarantee exclusive execution of the resource and it is set to True.

BOOLEAN falseX 


AutoFailoverDetermine whether to perform automatic failover when trouble occurs within the group.BOOLEANtrueO
AutoFaultClearTIme

 A failover occurs after trouble is detected, and it remains online for the given time limit. After that, all the trouble status will be removed.
'0' implies that troubles are not removed.

INTEGER0 secO
AutoRestart

If a group is not started because of failures in resource for detection, determine whether to automatically start it when the resource or node is normalized.
It will operate properly only if AutoStart is set to true.

BOOLEANfalseO
AutoRestartTimeoutThe wait time for the group to be checked by checking the group status automatically when Auto startsINTEGER0 secO
*AutoStartWhen the engine starts, it will notify when the group will be started automatically.BOOLEANtrueO
AutoStartNodeSet a node which group can be online while remote node being connected after MCCS main process is started.STRINGNONEO
BatchAfterOnline

Set the batch file to run after a group goes online.
Whether the batch file is successful or failed, it does not affect the progress of a group

FILE
O
BatchBeforeOffline

Set the batch file to run before a group goes offline.
Whether the batch file is successful or failed, it does not affect the progress of a group.

FILE
O
BatchTimeoutDesignate the time out for running the batch file.INTEGER300 secOEnabled

It allows group to be managed.
If the attribute value is set to 'false', a group cannot be controlled.

BOOLEANtrueO
*Failover

It indicates group is failing over due to failure.

BOOLEANfalseX
GroupNameIt is group name.NAME
X
Locked

The group is permanent locked. Lock a group to prohibit all commands and operation.
Unlike temporary locking permanent, locking is maintained even after the server reboots.

BOOLEANfalseX
LockedTimeoutSets the time limitation in case of using the "Temporary lock" item. The locking status would be unlocked after the time you've setted hereINTEGER6hO
MaxDependencyLevelDesignate the max vertical level that sets the dependencies among the resources in a group.INTEGER20 levelsXMonitoredIt indicates whether all the enabled resources are monitored.BOOLEANX
OnlineCount

It is the number of resource which is online within a group.'0' means that a group is offline.
The number of monitoring resources (network cards) is not included in the total number.

INTEGER
X
Parallel

It is a group's parallel attributes.
It indicates whether the resources in a group can be online in two nodes at the same time.
The value cannot be changed. It can be set only once when you add a group for the first time.

BOOLEANfalseX
PreActiveIt shows the name of node where a group was online before.STRING
X
StateThe attribute represents the group status of node (online, offline, trouble, unchecked).STRING
X
TargetNodeList

It is the list of nodes where a group is operated. Higher priority node will be primary node.

STRING
X
TLocked

The group is temporary locked.
It operates in the same way as the locked, but it is a temporary function that will be cancelled when the engine restarts. 

BOOLEANfalseX


Info

MCCS 는 사용자의 입력필드에 대한 입력값 제한 기능이 존재하며, 사용자가 잘못 입력한 데이터에 대해 자동 점검기능을 제공합니다 has function to limit input values against user's input field, and it provides function detects automatically data which is input wrong by user's mistake.


*AutoStart (true/false)

Determine whether to automatically start a group when making a new connection to a cluster in the system booting phase. (If the MCCS service is restarted or a single node is restarted to connect to operating MCCS, it will be ignored.)
If a parallel group is offline at a local node or some members are online, it will automatically start.
In case of a failover group, the target node with the highest priority will be automatically started first. In case of locking or troubles, a group will not be started.

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The state of the group is determined by the state of the resources.
However, the status of persistent resources like Ethernet adapter do not affect on the status of group because these resources should be online on both nodes commonly.
Basically the group may have the following states.

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[Figure] Group State View

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OptionDescription

-h

Display Help.

-uEnter the user account.
-pw

Enter the password .

-ip

It defines the node to access to execute command. If omitted, it will access to execute command for local node.

-p

It specifies the port to access to execute command.
If omitted, it will access to the default value and when you define specific port number as heartbeat, enter this followed by --p. 

-groupcommand

It defines group command.  
(add, delete, online, offline, move, clear, flush, modify, list, lock, unlock, state, monitor)

group

It enters name of the group. 

-a

[list] It defines the attribute value that should be listed if it is command.  
[modify] It lists the attribute and attribute value that should be changed if it is command. 
attribute : It defines the values of the group. 
attribute_value: It defines the values that should be changed.  

-r

It defines the resource to be managed.

-n

It defines node name to be managed.

-t

It defines the interval time.

-dep

It shows dependency of the group or the resource.


Example

add

Adds testGroupAdds testGroup.


mcgroup -add testGroup


delete

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