What is the maximum file size which i can upload to azure blob uploadfile method

Question

Please can i know what the maximum file size to upload to the azure storage blob using uploadfile api.

Gibeon

Note CloudBlob.UploadFile is from the old 1.7 lib and is deprecated. – Swithbert

Answer 1

Block Blobs originally had a maximum size of 200GB (with 4MB block size), and now may be up to 4.77TB (with new 100MB block size). Maximum number of blocks per blob: 50,000.

Take a look at operations on Block Blobs for more information about the REST API calls (including Put Block and Put Block List)

Septilateral

The max size was increased a while back right? :) It's now max 50,000 blocks with 100 MB each (around 4.75 TB). – Scriven

Correct, though the SDK has been changed over the years. I'll double-check the method names etc and update the answer accordingly. Thanks for catching the old storage size. – Septilateral

Answer 2

Update: as of December 2016 the maximum size of a Block Blob has increased to roughly 4.75TB (50,000 x 100MB blocks).

Source: https://azure.microsoft.com/en-gb/blog/general-availability-larger-block-blobs-in-azure-storage/

Neoclassic

Answer 3

It basically depends on what type of blob you are using. Understanding Block Blobs and Page Blobs explains everything in detail.

If you are using block blobs (UploadFile API):

If you are writing a block blob that is no more than 64 MB in size, you can upload it in its entirety with a single write operation. (Storage clients default to 32 MB, settable using the SingleBlobUploadThresholdInBytes property.)

Andro

I believe the quote you were looking for was the one just before the one which was pasted. "Each block can be a different size, up to a maximum of 4 MB. The maximum size for a block blob is 200 GB, and a block blob can include no more than 50,000 blocks" – Stoplight

Answer 4

Over time, the maximum upload size has increased. According to this MS document from 2021, the Maximum blob size (via Put Block List) is approximately 190.7 TiB (4000 MiB X 50,000 blocks) for Version 2019-12-12 and later. The referenced doc gives size limits for other versions as well.

Burma