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AlanManning-3796 asked AlanManning-3796 commented

Data box limitations

I have 13 TB of hyperbackup data in blob storage,
if necessary, will I be able to write all of this data to a databox for transfer?
I'm seeing some conflicting information regarding blob storage limitations as it relates to databox.
Thanks for any insight. Trying to make sure we have a solid disaster plan RTG.

azure-blob-storageazure-data-box-family
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AlanManning-3796 answered AlanManning-3796 commented

I am using a Azure storage account for offsite backup. Synology HyperBackup is using about 13TB total storage.

I don't really understand the limitations described other than total size but would like to verify that, if necessary, I can transfer all of the backup data to a data box for quick restore on my end.

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Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

No problem. These backup files would be block blobs so I think you only need to worry about the 4.75TiB file limit here.

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Thanks for your continuing patient assistance, Alan!
The 4.75TiB file limit is simply per file inside the blob, correct? (My confusion stems from not understanding how this limitation relates to the blob itself, and, admittedly, an incomplete understanding of blob storage at a granular level.)
I believe Hyperbackup is writing many discreet smaller files so that should not be an issue, which is perfect.
That said, it seems as though my existing plan is solid after all. Thank you again for confirming.

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AlanKinane avatar image AlanKinane AlanManning-3796 ·

No problem Alan. Yes, that is the limit per file so you should be OK here.

You might accept the answer above if it was helpful so that others on here can find it more easily.

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AlanKinane answered

I'm not sure which limitations you are speaking of. In terms of capacity, the standard size can hold up to 80TB of data. There are various limitations to be aware of and these are outlined on this page: https://docs.microsoft.com/en-us/azure/databox/data-box-limits

Hope this helps.

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AlanManning-3796 answered AlanKinane commented

Thanks. I'm referring specifically to the following, listed at the link you provided, which I also reviewed.

Azure object size limits
Here are the sizes of the Azure objects that can be written. Make sure that all the files that are uploaded conform to these limits.

AZURE OBJECT SIZE LIMITS
Azure object type Default limit
Block blob ~ 4.75 TiB
Page blob 8 TiB
Every file uploaded in page blob format must be 512 bytes aligned (an integral multiple), else the upload fails.
VHD and VHDX are 512 bytes aligned.

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Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

I'm not clear on the question. Are you looking to use Azure storage as an offsite backup or do you intend to spin up your VMs in Azure in the event of a disaster? If it's just purely for storage then they can be stored as block blobs up to 4.75TiB in size each. If you plan to use them for Azure VM disks then they would need to be in page blob format.

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