Is there any way to see sizes of individual prefixes within Storage Account containers?

This is still giving me sizes of individual blobs WITHIN the prefix. I am trying to understand the overall size of each prefix, not the blobs within those prefixes.

So, let's say I have a container called "test".

Within that container, I have 5 prefixes:

/Test1/

/Test2/

/Test3/

/Test4/

/Test5/

Within each of the 5 prefixes, there maybe hundreds, thousands, or even more files (blobs). So, using this example, I would want the CLI command to come back with ONLY the overall sizes of the prefixes. So, if /Test1/ had 100 files within it equalling 100gb, I want to know that /Test1/ is taking up 100gb, not the size of each individual file (blob) within.

Additionally, if there are any nested prefixes, I would want to know the size of those too.

I DID try running the CLI command, but like I mentioned, it is giving me sizes of the individual sizes within the prefix.

Using your example, I want to know the size of /Sample/, not the size of the 5 .tmp files within it.

Is there a CLI command

Hi Venkatesan S,

I need a way to see a summary of the sizes of the prefixes themselves, not of the individual files within them. I would also like to know the size of any nested prefixes.

Using your example, I would want to know the total size of /Sample/, not the size of the individual *.tmp files within that prefix.

The issue is that when a prefix has thousands, or even more individual files (blobs) within it, this cli command returns too much data, when all I really want to know is the total size of the prefix.

Hi Michael Alexander,

The issue is that when a prefix has thousands, or even more individual files (blobs) within it, this cli command returns too much data, when all I really want to know is the total size of the prefix.

Azure Blob Storage doesn't provide native prefix-level size metrics in the portal, but you can use this PowerShell script to get a complete breakdown of all prefixes (including nested folders) and their total sizes:

Script:

$account = "venkattest326"
$container = "test"
$rgName = "v-venkatesan"
# Get context with RG specified
$ctx = (Get-AzStorageAccount -ResourceGroupName $rgName -Name $account).Context
# Get all blobs and calculate prefix sizes recursively
$prefixSizes = @{}
Get-AzStorageBlob -Container $container -Context $ctx | ForEach-Object {
    $pathParts = $_.Name -split '/'
    $currentPrefix = ""
    
    for ($i = 0; $i -lt $pathParts.Count -1; $i++) {  # Stop before filename
        $currentPrefix += if ($currentPrefix -eq "") { $pathParts[$i] } else { "/$($pathParts[$i])" }
        $prefixKey = "$currentPrefix/"
        if (-not $prefixSizes.ContainsKey($prefixKey)) {
            $prefixSizes[$prefixKey] = 0
        }
        $prefixSizes[$prefixKey] += $_.Length
    }
}
# Convert to objects, sort by size, display
$prefixSizes.GetEnumerator() | ForEach-Object {
    [PSCustomObject]@{
        Prefix = $_.Key
        SizeGB = [math]::Round($_.Value / 1GB, 2)
    }
} | Sort-Object SizeGB -Descending | Format-Table -AutoSize

Output:

Prefix       SizeGB
------       ------
sample/       0.250
sample/data/  0.110
data/         0.000

Kindly let us know if the above helps or you need further assistance on this issue.

Please “up-vote” wherever the information provided helps you, this can be beneficial to other community members.

Thanks Venkatesan S.

I can confirm that this worked as expected and allowed me to get the information I need.

Hi Michael Alexander,

Posted as answer.
Please do not forget to and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.