–Primary site • Disk to Disk (Online Accessible) • Disk to Tape (NearlineAccessible)
– Secondary site • Disk to Disk (Online Accessible) • Disk to Tape (Offline Accessible)
With locations, we typically talked about on-line, near-line and off-line. On-line
The media is accessible and the data is usable. This is typically in a disk based format that is already mounted.
Near-line
Typically means that the media is accessible or available but the data has to be recovered. This would be like an onsite tape or data that is on a virtual tape library.
Off-line
Typically means that the media has to be recovered before we can recover the data. This would be like offsite tape storage.
These 3 locations sometimes get referred to as Tier 1, Tier 2 and Tier 3. This can be confusing.