CODEWITHSUNDEEP
azurepowershellazure-storageazure-powershellazure-storage-account
amaru96
amaru96

Reputation: 191

Get Storage Account size using Powershell using AZMetrics often returns 0

I'm using the AZ metrics command found in the answer posted below which usually works but every so often the result returns 0, even though I know the account is consuming storage. Also, if I run the same command against the same resource a little while later it returns the real result. Is anyone else using this method and finding similar results? Any suggestions to get around this?

Also, is it possible to use timegrain/timespan against a Storage Account?

List used space for blobs, files, tables, queues using PowerShell?

For reference, the command I'm using is: (Get-AzMetric -ResourceId "{resource_id}" -MetricName "UsedCapacity").Data

Upvotes: 0

Views: 1823

Answers (2)

user2188711
user2188711

Reputation: 49

The issue is that Azure does not always record a reading if the storage account is not in continuous use or its glitched. You can see this when you view the usage graph within the resource, it shows a dotted line this is the missing data. Azure only records a reading when the storage account is active which makes sense from a performance perspective.

The way to get a valid result is to increase the window for the data points to return. My fix was as follows

$UsedCapacityDay = (Get-AzMetric -ResourceId <storage account ID> -StartTime (Get-Date).adddays(-1) -EndTime (Get-Date) -MetricName "UsedCapacity")

# need to use this method as some data points have a null reading, query above returns 24 hours (24 readings)
# with a value in the "average" property other properties min/max are always null
# we don't actually want an average for space so we get the max
$UsedCapacity = $UsedCapacityDay.data.average | measure-object -max

Dotted line details

Azure Storage Resource Provider only reports the Availability data to Azure Monitor when there is ongoing activity Link for above statement

Upvotes: 0

Sridevi
Sridevi

Reputation: 22607

I tried to reproduce the same in my environment and faced the same issue.

enter image description here

When I ran the command again after some time, got null value like below:

enter image description here

After a while, when I ran the above command again, it gave the response successfully.

This issue usually happens because capacity metrics values will be refreshed daily (up to 24 Hours).

  • You can turn on the debugging to know what exactly is going wrong.
  • To turn on, use $DebugPreference = "Continue".
  • You can use Get-AzMetricDefinition to know the time intervals that are supported.

As a workaround, you can make use of timegrain/timespan against the storage account like below:

(Get-AzMetric -ResourceId "your_resource_id" -MetricName "UsedCapacity" -AggregationType Average -StartTime "02:00:00" -EndTime "04:00:00").Data

If still the issue persists, raise a bug/Azure support ticket.

References:

0-Value Result Get-AzMetric (UsedCapacity) · Issue #15863 · Azure/azure-powershell · GitHub

Get-AzMetric Returns Blank Results - githubmemory

Upvotes: 2

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