Data cannot be archived indefinitely. We ask project applications to state a realistic lifetime for a project. Some projects have a natural conclusion whereas others may extend into the future due to regulatory requirments or simply because the data is of great value. Typically, projects are granted archival for 1-5 years. Where longer retention is desired, we advise that a further case for continued archival is made on every 5 year anniversary, this being not too onerous while ensuring the archive receives appropriate occasional consideration.
- Backup accounts
Archived data must not be backed up to the HFS backup service. Where a client machine is sending data to both the backup service and the archive service, the TSM client software must be configured in such a way that avoids sending the same data to both backup and archive. We can help with the setup of this configuration. In practice this normally requires a physical separation of the archive data from backup data on the client (for example into a separate partition or root folder-path).
Long-term projects, and those requiring large amounts of data (> 4TB) will probably be asked to contribute to the on-costs of archive storage (see the HFS Service Level Description). Externally-funded projects should have a defined element for data storage and will be expected to contribute to these costs.
There are limits to the amount of data the service can store. In practice a range of between 50GB and 50TB is acceptable. Requests at either end of those scales will, however, be subject to greater scrutiny and possibly additional restrictions. At the lower end we might ask why local storage cannot be used. Towards the upper end, we might ask for additional assurances on data curation, provenance and access. Projects above 50TB may be considered but additional storage charges above 4TB may make a local storage solution more of an economic proposition.
The configuration and use of the TSM archive / retrieve client software differs subtly from the TSM Backup / Restore client. For this reason you are strongly encouraged to read the following sections in order.