Our customer was unable to import a bacpac file from Azure blob storage via portal, failing with error: "Import operation interrupted because insufficient local disk is available for bacpac file. Please use SSMS or SqlPackage to complete the operation."
The machines processing import/export requests submitted through portal or PowerShell need to store the bacpac file as well as temporary files generated by Data-Tier Application Framework (DacFX). The disk space required varies significantly among DBs with same size and can take up to three times of the database size. Machines running the import/export request only have 450GB local disk space. As result, some requests may fail with "There is not enough space on the disk" error. In this case, the workaround is to run SqlPackage on a machine with enough local disk space. When importing/exporting databases larger than 150GB, use SqlPackage to avoid this issue.