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Active-Active Controllers
Fast throughput and data availability are paramount for dedicated storage systems. RASTOR's active-active controllers are designed to improve both performance and data availability. Each disk group is assigned a "primary" controller Optimal performance is achieved when traffic goes through both controllers to their associated disk groups.
Multi-Path IO
In RASTOR, the system makes no assumption on the behavior of the hosts since they can switch from one path to the other. This is normally referred as "multi-path IO" - a technology to ensure end-to-end high availability for path failure. RASILIENT's patent-pending technology supports path failure with our cache coherency features. In the extreme case, the host can send commands to either controller randomly.
In-box Clustering
In RASTOR, the relationship between two controllers is tight. Each controller has the precise status of the other, which results in quick and accurate actions in the event of system failure.
For availability, both controllers can serve any disk group within the system. When there is a controller failure, the disk groups assigned to the failed controller will automatically "migrate" to the surviving controller without user intervention.
Global Sparing
In RASTOR, any drives not assigned to a disk group are automatically used as global hot spares. If a drive fails, the RAID controller can automatically rebuild its data on the spare drive without requiring intervention by the administrator. The rebuild operation occurs in the background while the controller processes normal operations.
Passive Mid-plane
RASTOR is built around a completely passive mid-plane. There are no components other than connectors in the mid-plane, a feature not commonly found in other storage systems of its kind and price point. In RASTOR, special attention has been taken to recover the data path failure due to signals stuck at zero or one. In addition, each active component such as the drives and controllers monitor the incoming current and shut down power in case of a short-circuit.
Dedicated SATA Channels
RASTOR's multi-path design provides a dedicated SATA channel from each controller. The elimination of inter-drive dependencies enhances availability. The patented dual-access scheme provides fair and robust access from each controller.
Software RAID
The RASTOR architecture focuses on the critical performance elements of protocol processing and data movement. The powerful Pentium processors and server chipset (high-speed front-side bus and DDR) present a data mover architecture that is superior over embedded processor solutions found in traditional storage arrays.
Traditional embedded solutions tend to be a generation behind in memory technology and require special chips to enhance performance. With a dedicated Pentium in the RASTOR array, expensive "hardware" RAID ( also referred to as XOR engine) is unnecessary. "Hardware" RAID is an important performance element in general-purpose servers to off-load the CPU for other server-based applications. In an external array with dedicated controllers and memory, "hardware" RAID only adds cost.
Robust Security
Enterprise data must be secured and closely guarded. In RASTOR, LUNs are only exposed to the hosts that have authority to access them. This is generally referred to as the LUN masking. In addition, CHAP authentication is used for each iSCSI session login. All management accesses are also protected with the access control list, which filters out the machines that are not on the list.
Simple, Intuitive Configuration
The web based user interface has been designed to be intuitive and extremely easy to use and requires little to no training. With the web based utility, a system administrator can set up a system in 6 simple steps
Copyright © 2004-2006 Rasilient Systems Inc.
Contact Us
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Investor Relations
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Active-Active Controllers
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Multi-Path IO
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In-box Clustering
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Global Sparing
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Passive Mid-plane
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Dedicated SATA Channels
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Software RAID
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Robust Security
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Simple, Intuitive Configuration
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