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.

RAID Rocks On

RAID (Redundant Array of Independent Disks) is nearly never in the news by itself these days, but the technology for protecting data on multiple drives is part of every SAN system announcement. According to industry sources, RAID is evolving to fit ongoing demand.

This week, for instance, EqualLogic's upgrade to its PS series IP SANs features the ability to manage multiple RAID levels as a single group. (See EqualLogic Firms Up Virtualization.) This kind of feature is cited by at least one analyst as part of the new look of RAID.

The ability to perform "RAID conversion, like from RAID5 to 0+1 with the data intact and in use and inside the array" is increasingly in vogue, says Greg Schulz, founder of the StorageIO consultancy

According to Schulz, other trends include the adoption of "RAID 6 or some variant involving dual parity to help protect against a double drive failure when using large capacity SATA and Fibre Channel disk drives." Also emerging are new kinds of RAID combinations, along with power management and optimization schemes.

At Detroit law firm Dickinson Wright, manager of operations Alan Wright cites features like these in describing his choice of EqualLogic's new gear. "If I want to use RAID 50, RAID 10, and RAID 5 in one array, I can manage them under one group instead of a different group for each RAID type," he says. (See EqualLogic Firms Up Virtualization.)

  • 1