VMware vCenter, Microsoft VMM Manager, Xen 管理和生产Cluster最佳实践
Seperate Management Cluster from Production Cluster.Provisioning a management cluster to host critical infrastructuremanagement components like vCenter, Active Directory, SAN management,and so on. To separate from production cluster.
A management cluster is a dedicated set of hosts (per site)configured as a VMware vSphere HA/DRS cluster. The management cluster isused to provide resources for virtual machines that provide managementfunctions for the virtual infrastructure. This includes (not all may beapplicable to every site); active directory (or similar), DNS/DHCP,general management server (for Network and SAN tools etc.), vCenterserver, database server for management databases, web client server,single sign-on server, Site Recovery Manager; vSphere replicationserver, vCenter operations manager (and other components of the Suite),vCloud Director cell (and related components), vCloud Networking andSecurity Manager, data protection servers (e.g. CommVault VSA).
The primary purpose of the management cluster is to separate theresources used to manage virtualisation workloads (i.e. anynon-management workload, so this includes dev etc.) from thosevirtualisation workloads themselves. In the event of a site failure andsubsequent recovery, the management cluster is the first thing you bringup. This means you can get the management functions back first andfaster.
So not only should the compute resources be separated (i.e. a separatecluster) but consideration should also be given to separating thestorage provisioned to the management cluster (from the productionstorage) – in a similar manner to how you would not retain backup copieson the same storage systems as production data. If separate storage isprovided then this may be a dedicated array, and consideration can alsobe given to the vSphere storage appliance which shares local storageacross a cluster of hosts (this would need further discussion though asthere are some limitations with the VSA).
A further validation for establishing a management cluster is thatamount of resources required to service the management components caneasily equate to the resources available from one or more hosts. Ifthese resources are provisioned from production clusters then this a)leaves less resource available for production workloads and b) makes itmore difficult to do capacity planning for production workloads (i.e. asmore management capability is added – think of adding metering andbilling at a later date – then less resources are available).
The management cluster should ideally be a three nodes cluster per site(best practises), although it is common to relax the three node clusterbest practise and have a two node N+1 cluster where N is 1 (goodpractise since we still have a Management Cluster). Ideally the samevirtual networking should be used across management clusters andproduction clusters (distributed virtual switch yes, but Nexus 1000Vpossibly not unless you are implementing the physical Nexus 1100appliance).
In summary, as the reliance on the virtual infrastructure continues torise (think how now business critical applications are being targetedmore frequently now), then increased resilience of the managementcomponents becomes critical.
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