In the fourth quarter of this year, Seagate rival HGST, a Western Digital Company, is expected to release disk drives filled with helium, which provides less resistance than air and thus allows the addition of another storage platter or two to a drive. The main types of storage media in use today include hard disk drives HDDssolid-state storage, optical storage and tape.
Using a half-inch wide nickel-plated phosphor bronze recording medium, this UNISERVO drive could store characters per inch at 12, characters per second. Pure Storage's FlashBlade enterprise storage array Unlike disk, flash storage devices do not rely on moving mechanical parts to store data, thus offering faster access to data and lower latency than HDDs.
For 50, customers, we add two commodity database servers running MySQL," with no performance hit on other users, says Piesche. Shetti says he expects prices per gigabyte to be comparable to those of current flash drives. Flash is nonvolatile, allowing data to persist in memory even if the storage system loses power.
In its simplest configuration, direct-attached storage DAS involves the internal hard drive in an individual computer. Pure Storage says its in-line data deduplication allows its flash arrays to store five or 10 times as much data as their designated size.
Recent advances in disk include shingled magnetic recordingin which data writes occur in overlapping fashion to boost the platter's areal density.
Spinning HDDs use platters stacked on top of each other coated in magnetic media with disk heads that read and write data to the media. Sanbolic claims its Melio5 data management platform provides high availability, application scale-out using shared-data server clusters, fast access to any size files in a variety of workloads, and is scalable to more than 2, physical or virtual nodes and up to 65, storage devices.
A high-speed actuator arm positions the recording head to the first available space on the disk, allowing data to be written in a circular fashion. Disk Density Gets Higher Still After about 10 years of steadily increasing densities, disks that use perpendicular magnetic recording PMR are topping out at about 1TB per square inch, says Mark Re, a senior vice president at storage vendor Seagate Technology.