In iSCSI storage servers such as the StorTrends 1U, 2U and 3U storage appliances from AMI, it preferable to have the TCP stack optimized for the LAN environment, since the servers used to serve I/Os over the iSCSI interconnect to the storage network (SAN), which is LAN-like in behavior. For replication over long distances, StorTrends iTX uses an intelligent combination of several standard IP transport protocols and a unique feature called WDS (WAN Data Services) to achieve near theoretical maximum throughput as determined by the bandwidth, taking into account the few resultant dropped packets.

Like many of its competitors, StorTrends employs delta-snapshot technology to transfer only the data that has changed between passes in order to reduce the amount of data transported. In addition to this, StorTrends also employs an intelligent data deduplication algorithm to filter out some of the previously transmitted data from earlier passes, in order to minimize the amount of data transported over WAN links.

In addition to the optimizations described above, StorTrends supports the compression and encryption of data before it is released on the WAN, which reduces the net size of data transferred over these more expensive links. StorTrends supports various compression depths, including an adaptive compression mode where the depth of compression is determined by an analysis of the current and statistical load on the system.

Want to Learn More?

For more information about the WAN Data Services (WDS) capability featured in StorTrends Data Storage appliances, log in to download the whitepaper from our Storage Library. If you haven’t already registered on StorTrends.com, click here to register and get started accessing detailed information on StorTrends products, including whitepapers, technical briefs, case studies, and more.