I've uploaded a large zip archive to Azure Storage BLOB container, ~9GB, using AzCopy utility. Now I'd like to check if it is correct. I can get "CONTENT-MD5" value from Azure Portal for the file. Then I need to calculate this on my side, right? Are there any other ways to check validity (except downloading this file)? It was archived using 7zip utility which doesn't have hash algo for MD5.
"Content-MD5" property of the uploaded blob is not maintained by Azure Storage Blob Service per real-time blob content. Actually, it's calculated by AzCopy during uploading and set to the target blob when AzCopy finishes uploading. Therefore, if you really want to validate the data integrity, you have to download the file using AzCopy with /CheckMD5 option, and then compare the downloaded file with your local original file.
However, given AzCopy has made its best effort to protect data integrity during transferring, the validation step above is probably redundant and strongly not recommended unless data integrity is much more important than performance under your scenario.