What LTO is
LTO is an open tape-storage standard used for backup and archival.
In practice, it is deployed either as a standalone drive (one tape at a time)
or as an automated tape library (robot + slots + one or more drives).
Why people still use tape:
- Air-gap / offline copy (strong ransomware resilience).
- Low cost per TB at large scale (media is cheap relative to disk).
- Low power for data “on a shelf” (no spinning disks).
- Long retention workflows (compliance / media archives).
Key components
- Tape media: LTO cartridges (RW or WORM variants).
- Drive: reads/writes one tape at a time; usually SAS or Fibre Channel at the host side.
- Library/autoloader: robotics + barcode reader + slots; presents one or more drives to the host.
- Host connectivity:
- Common: SAS (internal or external).
- Sometimes: Fibre Channel (often in larger SAN environments).
- For SAS libraries you typically use an HBA like Broadcom/LSI SAS 9300-series (example docs on Broadcom site).
- Software: backup app (e.g., Bacula/Bareos, Veeam, Commvault, etc.) or LTFS workflows for file-based archive.
Compatibility matters (migration planning)
Newer generations tightened compatibility. Official compatibility reference:
lto.org compatibility chart.
In particular, LTO-10 drives only read/write LTO-10 media, which affects upgrade/migration plans.
Useful primary references
Admin note: for media-heavy datasets, assume compression is near 1.0x. Plan using native TB and expect long sequential read/write windows.