SharePoint 2013 search 2 server Powershell

The below scripts helps all the search components on both the server in the sharepoint farm. It also provides option to specify the location of Primary and Secondary Index


if ( (Get-PSSnapin -Name "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null )
{
Add-PsSnapin "Microsoft.SharePoint.PowerShell"
}

#enter the Server name
$App1=""
$APP2=""

#Enter the app pool account and database details below
$SearchAppPoolAccountName = ""
$DatabaseServer=""
$DatabaseName="SearchDB"

#Set the primary and replica index location; ensure these drives and folders exist on application servers
$PrimaryIndexLocation="D:\Data\Index_Original"
$ReplicaIndexLocation="D:\Data\Index_Replica"

$SearchAppPoolName="SearchAppPool"
$SearchServiceName="Search Service Application"
$SearchServiceProxyName="Search Service Application Proxy"


#Create a Search Service Application Pool
$spAppPool=New-SPServiceApplicationPool -Name $SearchAppPoolName -Account $SearchAppPoolAccountName -Verbose

#Start Search Service Instance on all Application Servers
Start-SPEnterpriseSearchServiceInstance $App1 -ErrorAction SilentlyContinue
Start-SPEnterpriseSearchServiceInstance $App2 -ErrorAction SilentlyContinue
Start-SPEnterpriseSearchQueryAndSiteSettingsServiceInstance $App1 -ErrorAction SilentlyContinue
Start-SPEnterpriseSearchQueryAndSiteSettingsServiceInstance $App2 -ErrorAction SilentlyContinue

#Create Search Service Application
$ServiceApplication=New-SPEnterpriseSearchServiceApplication -Partitioned -Name $SearchServiceName -ApplicationPool $spAppPool.Name -DatabaseName $DatabaseName -DatabaseServer $DatabaseServer

#Create Search Service Proxy
New-SPEnterpriseSearchServiceApplicationProxy -Partitioned -Name $SearchServiceProxyName -SearchApplication $ServiceApplication


$clone = $ServiceApplication.ActiveTopology.Clone()
$App1SSI = Get-SPEnterpriseSearchServiceInstance -Identity $app1
$App2SSI = Get-SPEnterpriseSearchServiceInstance -Identity $app2


#We need two Admin processing components for HA
New-SPEnterpriseSearchAdminComponent –SearchTopology $clone -SearchServiceInstance $App1SSI
New-SPEnterpriseSearchAdminComponent –SearchTopology $clone -SearchServiceInstance $App2SSI

#We need two content processing components for HA
New-SPEnterpriseSearchContentProcessingComponent –SearchTopology $clone -SearchServiceInstance $App1SSI
New-SPEnterpriseSearchContentProcessingComponent –SearchTopology $clone -SearchServiceInstance $App2SSI

#We need two analytics processing components for HA
New-SPEnterpriseSearchAnalyticsProcessingComponent –SearchTopology $clone -SearchServiceInstance $App1SSI
New-SPEnterpriseSearchAnalyticsProcessingComponent –SearchTopology $clone -SearchServiceInstance $App2SSI

#We need two crawl components for HA
New-SPEnterpriseSearchCrawlComponent –SearchTopology $clone -SearchServiceInstance $App1SSI
New-SPEnterpriseSearchCrawlComponent –SearchTopology $clone -SearchServiceInstance $App2SSI

#We need two query processing components for HA
New-SPEnterpriseSearchQueryProcessingComponent –SearchTopology $clone -SearchServiceInstance $App1SSI
New-SPEnterpriseSearchQueryProcessingComponent –SearchTopology $clone -SearchServiceInstance $App2SSI


#We need two index partitions and replicas for each partition. Follow the sequence.
New-SPEnterpriseSearchIndexComponent –SearchTopology $clone -SearchServiceInstance $App1SSI -RootDirectory $PrimaryIndexLocation -IndexPartition 0
New-SPEnterpriseSearchIndexComponent –SearchTopology $clone -SearchServiceInstance $App2SSI -RootDirectory $ReplicaIndexLocation -IndexPartition 0
New-SPEnterpriseSearchIndexComponent –SearchTopology $clone -SearchServiceInstance $App2SSI -RootDirectory $PrimaryIndexLocation -IndexPartition 1
New-SPEnterpriseSearchIndexComponent –SearchTopology $clone -SearchServiceInstance $App1SSI -RootDirectory $ReplicaIndexLocation -IndexPartition 1

$clone.Activate()

The Other three database names are created by default. This is the most robust and highly available search I have used in case of 2 App servers.

Source Powershell Magzine and MSDN