Failover cluster Alert Automation - arrays

Question

In a high-availability environment (two DCs, Primary and Standby) with 50 clusters. Each cluster has 5 to 6 nodes in it. I want to ensure all the nodes in every cluster is "Online" (State) and running in "Primary" (OwnerNode). Any node that shows otherwise has to be noted.
I'm using arrays to store the required information in a foreach loop. The problem is, it is taking too long to compile. I want to complete it sooner.
$Clusternodes= * some 50 elements *
$Standbynodes= * some 50 elements *
foreach ($cluster in $Clusternodes) {
$NotOnline += Get-ClusterGroup -Cluster $Cluster |
where {$_.State -ne "Online"} |
Select-Object Name,OwnerNode,State
foreach ($node in $Standbynodes) {
$Standbys += Get-ClusterGroup -Cluster $Cluster |
where {$_.OwnerNode -eq "$node"} |
Select-Object Name,OwnerNode,State
}
}
Edit:
Get-clustergroup -Cluster $Cluster returns 5 to 6 entries in every cluster. The output contains three columns Name, OwnerNode, State.
I'm storing every entry in an array based on its state (whether it is running or not) and owner node (whether in primary or secondary DC). Hence, I want four arrays. While the former is easy, the latter isn't. As that itself is another two arrays with 50 odd elements in each. Hence I used hashtables for it as mentioned below. However, when I tried the below code it always returns an empty array.
$Clusternodes = * some 50 elements *
$Standbynodes = * some 50 elements *
$Primarynodes = * some 50 elements *
$pr = #{}
$sb = #{}
$Standbynodes | ForEach-Object { $sb[$_] = $true }
$Primarynodes | ForEach-Object { $pr[$_] = $true }
$RunninginPrimary = #()
$NotRunninginPrimary = #()
$RunninginStandby = #()
$NotRunninginStandby = #()
foreach ($cluster in $Clusternodes) {
$c = Get-ClusterGroup -Cluster $Cluster
$NotRunninginStandby += $c | Where-Object {
($_.State -ne "Online") -and ($sb.ContainsKey($_.OwnerNode))
} | Select-Object Name,OwnerNode,State
$NotRunninginPrimary += $c | Where-Object {
($_.State -ne "Online") -and ($pr.ContainsKey($_.OwnerNode))
} | Select-Object Name,OwnerNode,State
$RunninginStandby += $c | Where-Object {
($_.State -eq "Online") -and ($sb.ContainsKey($_.OwnerNode))
} | Select-Object Name,OwnerNode,State
$RunninginPrimary += $c | Where-Object {
($_.State -eq "Online") -and ($pr.ContainsKey($_.OwnerNode))
} | Select-Object Name,OwnerNode,State
}

Answer 1

You query each cluster multiple times. To speed up your code query each cluster just once, store the result in a variable, and use that variable in the rest of the loop. You may also want to replace the nested loop that iterates over $Standbynodes with a hashtable lookup.
$Clusternodes = ...
$Standbynodes = ...
$sb = #{}
$Standbynodes | ForEach-Object { $sb[$_] = $true }
$NotOnline = #()
$Standbys = #()
foreach ($cluster in $Clusternodes) {
$c = Get-ClusterGroup -Cluster $Cluster
$NotOnline += $c | Where-Object { $_.State -ne "Online" } |
Select-Object Name,OwnerNode,State
$Standbys += $c | Where-Object { $sb.ContainsKey($_.OwnerNode) } |
Select-Object Name,OwnerNode,State
}

Answer 2

Try using workflow.
workflow clusterCheck {
$Clusternodes= * some 50 elements *
$Standbynodes= * some 50 elements *
foreach -parallel ($cluster in $Clusternodes) {
$NotOnline += Get-ClusterGroup -Cluster $Cluster |
where {$_.State -ne "Online"} |
Select-Object Name,OwnerNode,State
foreach -parallel ($node in $Standbynodes) {
$Standbys += Get-ClusterGroup -Cluster $Cluster |
where {$_.OwnerNode -eq "$node"} |
Select-Object Name,OwnerNode,State
}
}
}
Source:- Scripting guy