Network Computing is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

United Airlines: Page 2 of 3

While Sherman won’t say how much the company has pumped into its so-called “business resumption” solution, he claims that it is well worth the price. “It makes very, very clear business sense,” he says. “The return on investment was well under a year.”

Unlike many other high-end disaster recovery solutions that mirror data to different states -- or even different countries -- ULS feels comfortable synchronously mirroring its data to a secondary site 10 miles away, Sherman says. Each data center runs 20 Tbytes of total disk space and 200 servers.

While the two sites are not very far apart, he explains, they rely on three different power grids. The primary site feeds into two separate grids, while the secondary site is on yet another grid. In addition, the primary site has two diesel generators and a number of different uninterruptible power supply (UPS) systems, while the secondary site has a natural gas backup system and a separate UPS system.

“If you’re running a primary business out of a data center of any sort, and you’re dependent on power, you need to make sure you always have power,” he says.

Using Veritas Volume Replicator host-based software (running on about eight different hosts), as well as a Hitachi Data Systems (HDS) subsystem-based replication software -- “just for our peace of mind” -- all information is synchronously replicated between the two data centers at all times. In addition, everything in both data centers is either clustered for failover, or hot clustered, using Veritas Cluster Manager.