Problem
在SharePoint 2013 场中移除服务器，提示 cacheHostInfo is null 错误
Resolution
这是由于SharePoint 2013中分布式缓存实例（Distributed Cache）在此服务器上已被注册，如果需要将此服务器从SharePoint 场里移除，首先必须将分布式缓存实例在此服务器上删除。
所以，通过PowerShell，得到分布式缓存实例，然后将其删除即可。
- 获取实例名
- 删除此Distributed Cache实例（比如该实例在GCP-WEB 01这台服务器上被注册）
- 完整PowerShell 代码如下
Add-PSSnapin Microsoft.SharePoint.PowerShell
$SPFarm = Get-SPFarm
$cacheClusterName = "SPDistributedCacheCluster_" $SPFarm.Id.ToString()
$cacheClusterManager = [Microsoft.SharePoint.DistributedCaching.Utilities.SPDistributedCacheClusterInfoManager]::Local
$cacheClusterInfo = $cacheClusterManager.GetSPDistributedCacheClusterInfo($cacheClusterName);
$instanceName ="SPDistributedCacheService Name=AppFabricCachingService"
$serviceInstance = Get-SPServiceInstance | ? {($_.Service.Tostring()) -eq
$instanceName -and ($_.Server.Name) -eq "Your Server Name"}
$serviceInstance.Delete()
