Tier 2: Data backup with a hot site

This tier has the same provisions for disaster recovery as Tier 1, plus provides a reserve computer system (so-called hot site) at a remote physical location. The hot site is capable of handling the same data processes as the main system. Upon a disaster event, the data saved on tapes are restored on this reserve system. This approach allows faster system restoration, as only data, not the system itself, are to be restored. The use of SolFS-based storages provide significant advantages over traditional backups. Since the reserve copying of data is made separate from the system, they can be deployed in the new places faster and by less-qualified personnel. The remote site will be able to start work in less time, thus significantly reducing RTO.

Tier 3: Electronic vaulting

Tier 3 has an additional provision for some mission critical data to be constantly copied to a remote server (electronic vault) through a dedicated channel. Since a bandwidth of such constantly open channel is limited, only predefined data of utmost importance can be backed up under these provisions. SolFS allows partition of the critical data into separate storage, which will significantly simplify their transfer and later recovery. The SolFS functionality can be enhanced so that the change to data, deemed to be critical, automatically triggers data transfer through the aforementioned dedicated channel to the electronic vault. Moreover, SolFS allows multistream access to the storage: your separate subsystem can monitor the state of the critical data and transfer them to electronic vault. The integrity of the storage is not violated, encryption and access authentication are also supported.

Tier 4: Point-in-time copies

This level is different from the previous three in that the hard disks are used in place of tape. The disk have faster access time, but still need to be shipped to a remote storage location through the same channels as tape. The advantage of the SolFS in this case is that SolFS-based storages are single files, and recording of a single file takes much less time than writing of all files and directory tree one-by-one. The same applies to the recovery. As in previous case, the remote facility receives encrypted disks, making data tampering impossible. Native use of compression increases speed of writing to disks and recovery even more.

Tier 5: Transaction integrity

Retail and service organizations are ofter centered around transactions: rounds of communication interactions between the company and its customer, vendor, supplier, etc. Applications used by these enterprises are also centered on the transaction, and preserving transaction integrity between its initiation and completion is very important. SolFS-based storages support transaction integrity by default. All transactional files remain in their original context, preserve their links and interdependencies. Recovery process from such storage returns all the transactions to the time point immediately preceding the disaster. The transaction generating/managing application can be restarted exactly where it was left with almost no data lost. To increase security and efficiency, all files changed during a transaction may be singled out in a separate storage for real-time immediate backup to a remote electronic vault. The feasibility and practicability of this approach depends on the logic and design of the transaction-generating application.

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