Limitations

IBM Deep Archive has the following limitations. All the limitations are based on a system that has IBM Diamondback Tape Library with IBM LTO 9 Tape Drives.

• The maximum total capacity is 27.3 PB uncompressed data.
  Note: IBM Deep Archive always enables data compression on tape. With LTO 9, the compression ratio is 2.5:1, which allows a maximum of 68.2 PB of data to be stored. However, the actual compression ratio depends on the nature and format of the data.
• The maximum object size is 5 TiB by using Multipart Upload capability.
  Note: The maximum object size is aligning with the Amazon S3 API reference version 2006-03-01. Similarly, other Multipart Upload limitations such as the Part size follow the same specifications. Also, the maximum object size that can be uploaded in a single PUT is 5 GiB. For objects larger than 100 MiB, consider to use the Multipart Upload capability.
• The maximum number of user accounts with programmatic access is 100.
• The maximum number of S3 buckets is 1500.
• The maximum number of objects per S3 bucket is 1,000,000.
• The maximum number of objects is 1.5 billion.
• The minimum recommended average object size is 100 MiB.
  Note: The size comes from minimizing the extra capacity consumption and the performance impact of the tape file system when IBM Deep Archive handles excessive number of files per tape.
• The naming rules for S3 buckets and S3 object keys adhere to AWS except for the object key length.
  • The maximum length of an object key name is 940 bytes in IBM Deep Archive.
  • The maximum length of a bucket name is 63 bytes which is the same as AWS.
• The WORM tape media is not supported.