Peribit improves WAN performance
All thanks to larger memory compression technique.
By Tim Greene, Network World and Bryan Betts | Network World US | Published: 00:00, 28 June 2004
Peribit has released new hardware and software that it claims will boost site-to-site WAN performance by compressing larger chunks of data, overcoming delays caused by high-latency links and using a better WAN connection when there is an alternative.
The hardware is the SM-500 for mirroring between sites, and the SR-100 point-to-point compression appliance. Together with new technology it calls network sequence mirroring (NSM), the SM-500 can cache up to 500GB when scanning WAN traffic. By spotting larger repetitive patterns, it can improve on previous compression products, the company said. Peribit competitors include Expand Networks, ITWorx, Packeteer, and Riverbed Technology.
Traditional compression devices only look for relatively short patterns. Or, if they recognise large chunks of data, it is as entire files, so even small changes to the files make it impossible to compress them. SM-500 views streams of bits, including those that represent data within files. So large patterns within files can be recognised and even if small changes are made, the device still can compress large chunks of the file. The company says it can store large patterns on disk instead of memory, keeping recognised patterns in its library indefinitely.
The SR-100 is an upgrade for Peribit's line of WAN enhancement devices. These previously topped out at 45Mbit/s, allowing them to support T3 or E3 lines, but the SR-100 can compress a 155Mbit/s OC-3 line, says Mike Banic, Peribit's corporate marketing VP. He adds that the new devices are due to ship in August, at £13,000 for the SR-100 and £5,000 for the SM-500.
Alongside the hardware, Peribit announced version 5 of its SRS operating software, and an integration framework called PeriSphere which ties together compression, bandwidth management, latency reduction, caching and path optimisation.
"I think we are broader than the competition," Banic said. "We differentiate ourselves by PeriSphere, using it to distribute intelligence. Networks have become more complex as people distributed applications and licences to overcome WAN problems, now they can pull that back and consolidate their data centres. We've also automated the deployment process, using a content management system to push out policies and so on."
Peribit's NSM is meant to augment its earlier, short-pattern recognition technology called Molecular Sequence Reduction (MSR). SM-500 also supports MSR so it can interoperate with Peribit SR appliances that only perform MSR.
SRS 5 adds the ability to monitor two connections - say a frame relay link between sites and the Internet connections to those sites. Users can set policies that describe the latency, packet loss and jitter on the connections and route applications to the appropriately performing link for each application.
"We have also added IPSec tunneling capabilities to SRS 5, so there's no more need for a separate VPN box," Banic says. He adds that this will be available as an upgrade for existing Peribit appliances. However, the maximum speed of an IPSec connection between Peribit boxes is 15Mbit/s.
Registered readers can find an interview with Peribit on WAN acceleration here.