Cluster | Zone

Operations on multiple clusters are supported. That is, you can create more than one cluster in a zone, and allocate newly created hosts to different clusters as needed.

Cluster | Primary Storage and L2 Network

Primary storage and L2 network can be attached to or detached from a cluster. The following diagram shows the relationship between cluster and primary storage, L2 network, as shown in Figure 1.

Note:

When you attach primary storage and L2 network to cluster, note that:

1. Cluster | Primary Storage
   • A primary storage can be attached to one or more clusters.
   • A cluster can have one or more primary storages attached.
   • When you attach multiple LocalStorage primary storages to a cluster, partition the corresponding URLs on the hosts before you add hosts and primary storages, and make sure that each LocalStorage is deployed on an exclusive logical volume or physical disk.
   • A primary storage can be accessed by all hosts in the cluster to which the primary storage belongs.
   • If a primary storage cannot be accessed by hosts in the cluster due to network typology changes in the data center, you can detach the primary storage from the cluster.
2. Cluster | L2 Network
   • A cluster can have one or more L2 networks attached. Also, an L2 network can be attached to one or more clusters.
   • A cluster can have a VXLAN pool attached. The VNIs in the VXLAN pool can be used to create different VxlanNetworks.
   • One NIC can have only one NoVlanNetwork created.
   • For VlanNetwork, different VLAN IDs represent different L2 networks.
   • If hosts in a cluster no longer exist in the layer 2 broadcast domain of an L2 network due to network typology changes in the data center, you can detach the L2 network from the cluster.

Cluster | Backup Storage

No direct dependency exists between a cluster and a backup storage. A backup storage can provide services for multiple clusters.

Note:

• The primary storage and backup storage attached to the same cluster are associated with each other.
• A Ceph primary storage can work with backup storages of the ImageStore type.
• The following table lists the relationship between primary storages (PS) and backup storages (BS), as shown in Table 1.

  Table 1. Relations Between Primary Storage and Backup Storage

  PS/BS	ImageStore	SFTP	Ceph
  LocalStorage	○	○	×
  NFS	○	○	×
  Shared Mount Point	○	○	×
  Ceph	○	×	○
  Shared Block	○	×	×

Properties

Sample

{     "inventories":          {             "createDate": "Oct 30, 2017 1:50:00 PM",             "description": "",             "hypervisorType": "KVM",             "lastOpDate": "Oct 30, 2017 1:50:00 PM",             "name": "Cluster-1",             "state": "Enabled",             "type": "zstack",             "uuid": "5c3699713b1c43219de14df7545f24d0",             "zoneUuid": "e59b71e99d8a4ea1952b578388b8cd1d"         } }

Hypervisor Type

Hypervisor type indicates what kind of hypervisor (operating system) is installed on hosts in a cluster.

State

A cluster has the following two states: Enabled and Disabled, which is similar to Zone. When you change the state of a cluster, the change operation will be cascaded to all hosts in the cluster. For example, if you disable a cluster, you will also disable all hosts in the cluster.