The recent Storage industry challange is minimize downtime and how to keep business running 24 X 7 X 365. The data that drives today’s globally oriented businesses is stored on large networks of interconnected computers and data storage devices. This data must be 100% available and always accessible and up-to-date, even in the face of local or regional disasters. Moreover, these conditions must be met at a cost that is affordable, and without in any way hampering normal company operations.
To reduce the business risk of an unplanned event of this type, an enterprise must ensure that a copy of its business-critical data is stored at a secondary location. Synchronous replication, used so effectively to create perfect copies in local networks, performs poorly over longer distances.
1) Synchronous – Every write transaction committed must be acknowledged from the
secondary site. This method enables efficient replication of data within the local
2) Asynchronous – Every write transaction is acknowledged locally and then added to a
queue of writes waiting to be sent to the secondary site. With this method, some
data will normally be lost in the event of a disaster. This requires the same
bandwidth as a synchronous solution.
3) Snapshot –A consistent image of the storage subsystem is periodically transferred to the secondary site. Only the changes made since the previous snapshot must be transferred, resulting in significant savings in bandwidth. By definition, this solution produces a copy that is not up-to-date; however, increasing the frequency of the snapshots can reduce the extent of this lag.
4) Small-Aperture Snapshot – Kashya’s system offers the unique ability to take frequent snapshots, just seconds apart. This innovative feature is utilized to minimize the risk of data loss due to data corruption that typically follows rolling disasters.
Kashya’s advanced architecture can be summarized as follows:
Positioning at the junction between the SAN and the IP infrastructure enables Kashya
Deploy enterprise-class data protection non-disruptively and non-invasively
Support heterogeneous server, SAN, and storage platforms
Monitor SAN and WAN behavior on an ongoing basis, to maximize the data
Advanced algorithms, that:- Automatically manage the replication process, with strict adherence to userdefined policies that are tied to user-specified business objectives