It continuously captures data as it is written, maintaining a complete data history that can be quickly accessed and recovered back to the protected server to any point in time for continuous protection, without the capacity requirements or administration overhead of disk mirroring
. StorageTek's EchoView E400 protects up to 50 volumes and 400GB of data.
Many companies are using IP networks for remote disk mirroring which is typically synchronous and therefore uses substantial network bandwidth during the day.
For example, using existing IP networks between geographically separated facilities, companies can support their daily production network and real-time synchronous data replication and disk mirroring applications by day, and perform scheduled, asynchronous tape backups during evenings and weekends, when excess bandwidth is available.
This data is best suited for disk mirroring
or replication, as instantaneous recovery is mandatory and is also backed up on tape to provide a copy of data prior to disruption.
Of these systems, which generally relied on proprietary hardware, many merely tried to extend local redundancy techniques such as disk mirroring
. But trying to adapt to distributed-data redundancy techniques that were designed for local protection meant that too many of these solutions required huge amounts of dedicated bandwidth.
Key storage applications such as disk mirroring
, backup and recovery are becoming mission-critical for ensuring ecommerce and enterprise continuity.
This storage may be a shared SCSI disk drive or virtual shared storage through a volume of file level disk mirroring
tools are accomplishing such things right now and so-called "snapshot" tools are following right along, but disk drives are anything but invulnerable.
While disk mirroring
is often considered a "safety" process, to be used only to protect data, this view looks to the past, not toward the future.
However, applications such as disk mirroring
and backup/restore demand greater distances.