Tape nearline archives typically consist of a server connected to NAS via a network (NAS) and running software that manages
They fulfill the archive requirements as follows:
1) Lower costs than existing primary storage
– Yes, most companies already have a tape backup installed, so only additional software is required
– The band has a low power consumption
2) Long-term storage
– Yes, the life of tape media is estimated to be 7-10 years
However, tape technology is not always backwards compatible
For example, a tape written using LTO1 technology can not be read with the current LTO5 drive
3) Compliance with regulations
– No, the tape can be changed because the tape is basically re-writable
It requires additional software to prevent the switching of information
4) Transparent access to archive information
– Yes, but not suitable for direct access. The tape needs to be spooled.
– Much taping also reduces reliability
– Access to files is slow, because the start of individual files is delayed for a long time
5) Offline management of very old information
– Yes, the removability of media allows off-lining information.
– However, the tape must be re-tensioned regularly to prevent the tape from sticking
– Band prone to (electromagnetic) magnetic radiation
Tape systems are traditionally used for data backup and are best suited for transferring large volumes of data at once. They are not designed to write or read individual files, which is typical for an archive, and this reduces their reliability.
Compatibility is also a problem for tape users because each tape format is proprietary. As tape standards change approximately every 7 to10 years, efficiency is significantly reduced as data needs to be migrated to new standards and exchanges between different vendors may be complicated.