- the relatively new concept of continuous data protection (CDP), for creating point-in-time recovery images of specific mission critical datasets – typically email and databases.
- virtual tape libraries (VTL), enabling the creation of a high-speed disk-staging capability for current, but not critical data.
- replication to a disk platform at a secondary site, ready for remote access by the primary site in the event of catastrophic data loss at the primary site.
- and vaulting, for old data that needs to be archived and retained, perhaps in case it may one day be needed for reference, or simply for compliance reasons.
But customers also require of their data protection solutions suitable levels of protection for ‘warm’ data – say, up to six months old.
Space-efficient delta snapshots enable production data to be restored to a pre-defined moment in time with guaranteed data integrity, at a granularity of perhaps every two hours. These snapshots can be retained for, say, three months.
Finally, businesses require protection for their ‘cold’ data – up to a year old, perhaps. Clearly this can be restored from backup tapes, giving a granularity of perhaps a day, week or month, depending on the policy for taking full or incremental backups. The two main problems organisations faced when physical tape predominated are well-documented: media failure or robotic failure. The introduction of virtual tape libraries (VTL) eliminated these particular errors and also enabled backups and the corresponding restore processes to take place up to four times more quickly.
The following diagram summarises the Recovery Lifecycle Management data protection strategy, and shows how it may be enacted through a suitably-aligned product portfolio: hot data is protected by CDP, delta snapshots provide protection for warm data and VTL storage takes care of cold data. Ultimately, after a process of Redundant Data Elimination (RDE), a ‘single instance store’ may also be created for long term retention.
Although many IT vendors actively promote ‘return on investment’ on storage and data protection purchases, many disk platforms for data protection have been purchased over the last three years in order to guarantee the backup and restore process, with return on investment considered a secondary issue – certainly secondary to ensuring business continuity. However now those platforms are in and operational, IT departments are looking to see a return on investment for these purchases as they would for any other major IT purchase.
As a result, return on investment has become a requirement of installed data protection solutions as much as it has for new purchases. The Taneja Group believes that 2006 and 2007 will be all about businesses trying “to assemble reliable recovery infrastructures that make their disk backup investments worthwhile”, and envisions “recovery tiers [taking up] residence alongside storage tiers in the industry vernacular.” It’s a vision that we at FalconStor share – as might be expected having developed a comprehensive family of products that enable recovery lifecycle management.