Calculate the size of blob containers with PowerShell

This script calculates the size of all Azure Blob Storage containers in a storage account.

This sample requires Azure PowerShell. Run Get-Module -ListAvailable Az to find the version. If you need to install or upgrade, see Install Azure PowerShell module.

Run the Connect-AzAccount cmdlet to connect to Azure.

If you don't have an Azure subscription, create an Azure free account before you begin.

Important

This PowerShell script provides an estimated size for the containers in an account and should not be used for billing calculations. For a script that calculates container size for billing purposes, see Calculate the size of a Blob storage container for billing purposes.

Sample script

<#
.SYNOPSIS
Calculates the total size of blobs in all containers in a specified Azure storage account.

.DESCRIPTION
Before running this script, ensure you have:
- A storage account created
- At least one container in the storage account
- Uploaded some blobs into the container

.EXAMPLE
.\Get-AzureStorageAccountBlobSize.ps1 -StorageAccountName mystorageaccount -ResourceGroupName myResourceGroup

.NOTES
This script incurs transactional costs for Azure requests.
#>

[CmdletBinding()]
param (
    [ValidateNotNullOrEmpty()]
    [string]$ResourceGroupName = '<name-of-your-resource-group>',
    
    [ValidateNotNullOrEmpty()]
    [string]$StorageAccountName = '<name-of-your-storage-account>'
)

$containerstats = @()

# Get a reference to the storage account and the context.
$storageAccount = Get-AzStorageAccount -ResourceGroupName $ResourceGroupName -Name $StorageAccountName
$Ctx = $storageAccount.Context

$container_continuation_token = $null
do {
  $containers = Get-AzStorageContainer -Context $Ctx -MaxCount 5000 -ContinuationToken $container_continuation_token    
  $container_continuation_token = $null

  if ($containers -ne $null) {
    $container_continuation_token = $containers[$containers.Count - 1].ContinuationToken
    
    for ([int] $c = 0; $c -lt $containers.Count; $c++) {
      $container = $containers[$c].Name
      Write-Verbose "Processing container : $container"
      $total_usage = 0
      $total_blob_count = 0
      $soft_delete_usage = 0
      $soft_delete_count = 0
      $version_usage = 0
      $version_count = 
      $snapshot_count = 0 
      $snapshot_usage = 0
      $blob_continuation_token = $null
      
      do {
        $blobs = Get-AzStorageBlob -Context $Ctx -IncludeDeleted -IncludeVersion -Container $container -ConcurrentTaskCount 100 -MaxCount 5000 -ContinuationToken $blob_continuation_token
        $blob_continuation_token = $null
        
        if ($blobs -ne $null) {
          $blob_continuation_token = $blobs[$blobs.Count - 1].ContinuationToken
          
          for ([int] $b = 0; $b -lt $blobs.Count; $b++) {
            $total_blob_count++
            $total_usage += $blobs[$b].Length
            
            if ($blobs[$b].IsDeleted) {
              $soft_delete_count++
              $soft_delete_usage += $blobs[$b].Length
            }
            
            if ($blobs[$b].SnapshotTime -ne $null) {
              $snapshot_count++
              $snapshot_usage+= $blobs[$b].Length
            }
            
            if ($blobs[$b].VersionId -ne $null) {
              $version_count++
              $version_usage += $blobs[$b].Length
            }
          }
          
          if ($blob_continuation_token -ne $null) {
            Write-Verbose "Blob listing continuation token = {0}".Replace("{0}",$blob_continuation_token.NextMarker)
          }
        }
      } while ($blob_continuation_token -ne $null)
      
      Write-Verbose "Calculated size of $container = $total_usage with soft_delete usage of $soft_delete_usage"
      $containerstats += [PSCustomObject] @{ 
        Name = $container 
        TotalBlobCount = $total_blob_count 
        TotalBlobUsageinGB = $total_usage/1GB
        SoftDeletedBlobCount = $soft_delete_count
        SoftDeletedBlobUsageinGB = $soft_delete_usage/1GB
    SnapshotCount = $snapshot_count
    SnapshotUsageinGB = $snapshot_usage/1GB
    VersionCount = $version_count
    VersionUsageinGB = $version_usage/1GB
      }
    }
  }
  
  if ($container_continuation_token -ne $null) {
    Write-Verbose "Container listing continuation token = {0}".Replace("{0}",$container_continuation_token.NextMarker)
  }
} while ($container_continuation_token -ne $null)

Write-Host "Total container stats"
$containerstats | Format-Table -AutoSize

Clean up deployment

Run the following command to remove the resource group, container, and all related resources.

Remove-AzResourceGroup -Name bloblisttestrg

Script explanation

This script uses the following commands to calculate the size of the Blob storage container. Each item in the table links to command-specific documentation.

Command	Notes
Get-AzStorageAccount	Gets a specified Storage account or all of the Storage accounts in a resource group or the subscription.
Get-AzStorageContainer	Lists the storage containers.
Get-AzStorageBlob	Lists blobs in a container.

Next steps

For a script that calculates container size for billing purposes, see Calculate the size of a Blob storage container for billing purposes.

For more information on the Azure PowerShell module, see Azure PowerShell documentation.

Find more PowerShell script samples in PowerShell samples for Azure Storage.