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This article mainly explains "how to configure mscs clusters on vsphere6.0". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's ideas to study and learn "how to configure mscs clusters on vsphere6.0".

Implement MSCS cluster in vsphere6.0 environment, verification always fails and storage error is reported.

Problem analysis:

Shared storage is established in the traditional way, that is, create a shared virtual disk, and then write multi-writer. The reference documents are as follows:

Http://pubs.vmware.com/vsphere-60/index.jsp#com.vmware.vsphere.mscs.doc/GUID-674A9161-9AF9-4746-8D7B-8C7795A1FB49.html

Found:

Whether the two nodes in the MSCS cluster are on the same physical host or not determines the final deployment. If two virtual machines on a single physical machine are clustered, virtual disks are used. If the two virtual machines are distributed on different physical hosts, the shared storage needs to be mounted using pass-through RDM. According to our actual situation, considering that the two nodes on the same physical host can not play the role of failover, we should choose a cluster across physical hosts.

Solution:

Configuration steps:

1. Configure separate virtual machines in the cluster DRS rules to ensure that the two virtual machines are not on the same physical host.

Add a new disk to the first node. Choose to add a RDM disk and select a SAN data store because each shared LUN on the SAN requires a shared RDM file. Select physics as the compatibility mode. Select a new virtual appliance node (for example, select SCSI (1:0)), and then click next. Click OK to finish creating the disk.

After the creation is complete, in the Settings dialog box, expand the SCSI controller and select the change Type drop-down menu. Windows server 2012 choose LSI Logic SAS.

Then select the SCSI bus sharing drop-down menu. Set SCSI bus sharing to physical, and then click OK.

Add a disk to the second node. Select to add an existing disk.

Find the existing disk file in the virtual machine directory of the first node and add it. After the addition, keep the configuration of the virtual device node and the first node consistent. When powered on after this configuration, the MSCS configuration conditions can be met.

Add:

The Microsoft server provides three technologies that support clustering: network load balancing (NLB), component load balancing (CLB), and Microsoft Cluster Service (MSCS).

Network load balancing

Network load balancing acts as a front-end cluster that distributes incoming IP traffic across the server cluster and is ideal for incremental scalability and excellent availability for e-commerce Web sites. Up to 32 computers running Windows Server 2003 series products can be connected together to share a virtual IP address. NLB enhances scalability by distributing its client requests among multiple servers within the cluster. As traffic increases, more servers can be added to the cluster, with a maximum of 32 servers in any one cluster. While providing continuous service to users, NLB also provides high availability, that is, it automatically detects server failures and redistributes client traffic among the remaining servers within 10 seconds.

Component load balancing

Component load balancing distributes the load among multiple servers running the site's business logic. It achieves the dynamic balance of COM+ components in a server cluster with up to eight equivalent servers. In CLB, the COM+ component is on a server in a separate COM+ cluster. The call to activate the COM+ component is to balance the load to the different servers in the COM+ cluster. CLB works with NLB and cluster services through the middle tier that acts on a multi-tier cluster network. CLB is provided as a feature of Application Center 2000 and can run on the same set of computers as the Microsoft clustering service.

Cluster service

The cluster service acts as a back-end cluster, providing high availability for applications such as databases, messaging, and file and print services. When either node (the server in the cluster) fails or goes offline, MSCS attempts to minimize the impact of the failure on the system.

MSCS failover is achieved through redundancy in multiple computers connected in the cluster, each with an independent failure state. To achieve redundancy, applications need to be installed on multiple servers in the cluster. But at any one time, the application is online on only one node. When the application fails or the server goes down, the application will be restarted on another node.

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