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Bit integrity checks of all content are conducted twice yearly. For each content item stored in Amazon S3, the file is retrieved from storage and a checksum is calculated. This checksum is compared to both the checksum stored by S3 and the checksum maintained in the DuraCloud space manifest. Files from Amazon Glacier are not retrieved, but the checksum provided by Glacier storage is compared with the DuraCloud space manifest. The primary reason for this is cost; pulling content out of Glacier adds a significant cost overhead, which reduces its promise of being a low cost storage option. Because of this, we do not offer Glacier as a primary storage option in DuraCloud, it must be paired with S3 as primary storage.
DuraCloud provides an audit log (full list of events) and manifest for each content space listing all items and checksums. Each DuraCloud space provides a list of all content included. The DuraCloud Sync Tool provides history logs of all files transferred or updated. Additional reporting needs can be accommodated through custom development.
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