About Storage agents


About Storage agents
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Storage agents monitor shared storage and make shared storage highly available. Storage includes shared disks, disk groups, volumes, and mounts.

See the Veritas Cluster Server Bundled Agents Reference Guide for a detailed description of the following agents.

Table: Storage agents and their description shows Storage agents and their description.

Table: Storage agents and their description

Agent	Description
DiskGroup	Brings Veritas Volume Manager(VxVM) disk groups online and offline, monitors them, and make them highly available. DiskGroup resources can depend on DiskReservation resources, if Dynamic Multi-pathing is not configured in Veritas Volume Manager.
DiskGroupSnap	Brings resources online and offline and monitors disk groups used for fire drill testing. The DiskGroupSnap agent enables you to verify the configuration integrity and data integrity in a Campus Cluster environment with VxVM stretch mirroring. The service group that contains the DiskGroupSnap agent resource has an offline local dependency on the application's service group. This is to ensure that the fire drill service group and the application service group are not online at the same site.
DiskReservation	Enables you to reserve and monitor all SCSI disks or a percentage of disks for a system. Such reservations prevent disk data corruption by restricting other nodes from accessing and writing to the reserved disks by giving exclusive access to system for a shared disk.
Volume agent	Makes Veritas Volume Manager(VxVM) Volumes highly available and enables you to bring the volumes online and offline, and monitor them. Volume resources depend on DiskGroup resources.
VolumeSet agent	Brings Veritas Volume Manager (VxVM) volume sets online and offline, and monitors them. Use the VolumeSet agent to make a volume set highly available. VolumeSet resources depend on DiskGroup resources.
LVMLogicalVolume	Brings resource online and offline, and monitors Logical Volume Manager (LVM2) logical volumes. You can use this agent to make logical volumes highly available and to monitor them. LVMLogicalVolume resources depend on LVMVolumeGroup resources.
LVMVolumeGroup	Brings Logical Volume Manager (LVM2) volume groups online and offline, monitors them, and make them highly available. No fixed dependencies exist for the LVMVolumeGroup agent. When you create a volume group on disks with a single path, Symantec recommends that you use the DiskReservation agent.
Mount	Brings resources online and offline, monitors file system or NFS client mount points, and make them highly available. The Mount agent can be used with the Volume and DiskGroup agents to provide storage to an application. The Mount agent supports both IMF-based monitoring and traditional poll-based monitoring.