Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
Temp storage inconsistency
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Lukasz Andrzejak
126
Reputation points
I am using azure app service with linux docker containers (which use temp storage for containers and images).
We are using the Premium v3 P2mv3 app service plan and our app has 63gb temp/host storage available that I can see from inside the containers and kudu bash shell.
I am basing my information on the documentation outlining os limitations.
I have observed the storage at times jumps to 140gb (our app was running out of disk space).
Is the above page outdated and does azure do some sort of dynamic scaling of storage that isn't documented anywhere ?
I have tried switching the app service plan to P3V3, but this did not result in increased storage being available - I was still only seeing a 63gb storage mount (because of this I have switched back).
Which app service plans guarantee 140gb of temp storage ?
Azure App Service
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SnehaAgrawal-MSFT 22,721 Reputation points Moderator2024-10-10T09:44:43.1033333+00:00 @Lukasz Andrzejak Thanks for asking question! You may want to know that for Temporary files- A number of common Windows locations are using temporary storage on the local machine. For instance,
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%APPDATA%maps to%SYSTEMDRIVE%\local\AppData. -
%ProgramData%maps to%SYSTEMDRIVE%\local\ProgramData. -
%TMP%maps to%SYSTEMDRIVE%\local\Temp. -
%SYSTEMDRIVE%\local\DynamicCachefor Dynamic Cache feature.
Unlike Persisted files, these files are not shared among site instances. Also, you cannot rely on them staying there. For instance, if you restart a web app, you'll find that all of these folders get reset to their original state.
For Free, Shared and Consumption (Functions) sites, there is a 500MB limit for all these locations together (i.e. not per-folder).
For Standard and Basic sites, the limit is higher and differs depending on the SKU. The limit applies to all sites in the same App Service Plan. For instance, if you have 10 sites in S2 App Service Plan, those sites (and their scm sites) will have a combined limit of 15 GB. This same limit is applied on each VM instance - not a shared limit combined across instances.
See limit for other SKU below.
Another important note is that the Main site and the scm site do not share temp files.
So if you write some files there from your site, you will not see them from Kudu Console (and vice versa). You can make them use the same temp space if you disable separation (via WEBSITE_DISABLE_SCM_SEPARATION). But note that this is a legacy flag, and its use is not recommended/supported.
You can check your limit and usage in portal by going to "Diagnose and solve problems" section of your App Service blade, selecting "Best Practices", "Best Practices for Availability, Performance", and then "Temp File Usage On Workers".
Please note that the displayed usage and limits are per worker, and are aggregated across all apps in the same app service plan.
Reference- https://github.com/projectkudu/kudu/wiki/Understanding-the-Azure-App-Service-file-system
Also suggest you to refer this doc link would be helpful- https://learn.microsoft.com/en-us/troubleshoot/azure/app-service/faqs-app-service-linux#my-container-fails-to-start-with--no-space-left-on-device---what-does-this-error-mean-
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Lukasz Andrzejak 126 Reputation points
2024-10-11T09:05:41.7533333+00:00 @SnehaAgrawal-MSFT thank you for your reply.
I am using linux docker images, not windows. I am aware of the limitations of temp storage.
The kudu wiki you linked has been archived, the SKU listing you provided does not list PremiumV3 plans (the figures you quoted have not been updated on the wiki since 2018).
Upgrading to PremiumV3 P3V3 has not upgraded the temp storage to 140gb.
Which app service PremiumV3 plans guarantee 140gb of temp storage ?
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Lukasz Andrzejak 126 Reputation points
2024-10-11T09:08:02.0233333+00:00 removed duplicate post
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SnehaAgrawal-MSFT 22,721 Reputation points Moderator
2024-10-15T14:15:14.3+00:00 @Lukasz Andrzejak Reached out to you privately.
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