Powershell Multiple values comparison-CodePudding

I obtain the available raw disks on my VM by using

$availDisks = Get-PhysicalDisk -CanPool $true

The $availDisks contains 3 RAW disks I would like to effectively compare the size of the disks, and if they are the same size, to stripe them.

$availDisks.Size gives me the output of the 3 disks, but I need to compare each one of them.

The method I used is

$size = $availDisks[0].size
foreach($disk in $availDisks){
   if($disk.size -eq $size){
      Write-Host "The disk is equal to the desired size"
      continue with the disk striping
   }else{
      Write-Error "One of the disks is not matching the size"
      Do something else
   }
}

Is there a more effective method?

CodePudding user response：

You can use Group-Object targeting the Size property of the object:

Get-PhysicalDisk -CanPool $true | Group-Object Size |
    Where-Object Count -GT 1 | ForEach-Object Group

Group the objects by the value of the Size property, filter the groups where the Count is greater than 1 (meaning disks with the same Size), then output each filtered object. If you don't get any output from this, means that the disks have different sizes.

CodePudding user response：

Use Select-Object -Unique on the disk sizes to check if there is exactly one unique value. If there is any other value you either have no disks or a non-equal sizing of disks.

if( @( $availDisks.Size | Select-Object -Unique ).Count -ne 1) {
  Write-Error "One of the disks is not matching the size"
  # Do something else
} else {
  Write-Host "The disks are equal to the desired sizing"
  # Continue with the disk striping
}