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SAS (Serial Attached SCSI) is the interface architecture used to transmit data from the storage controllers to the disk drives in the Adaptable Modular Storage 2000 family. The SAS interface is a full duplex, point-to-point architecture with up to 9600 MB/sec of total system bandwidth and up to 32 links available for concurrent I/O activity.
Storage servers housing 24 SAS hard disk drives per server. A typical Serial Attached SCSI system consists of the following basic components: An initiator: a device that originates device-service and task-management requests for processing by a target device and receives responses for the same requests from other target devices.
Each storage pool is tiered based on the performance characteristics of the storage technology used, with SSD-based storage at the top “extreme performance tier,” serial-attached SCSI (SAS) in the middle “performance tier” and near line SAS (NL-SAS) in the bottom “capacity tier.” RAID protection is applied at the tier level. [23]
At the heart of the system is the HiStar E-Network, a network crossbar switch matrix. This storage platform is made up of different technologies than USP and USP V. The connectivity to back-end disks is via 6 Gbit/s SAS links instead of 4 Gbit/s Fibre Channel loop. The internal processors are now Intel multi-core processors, and in addition to ...
The following design aspects help SCST to reach the high performance this project is known for: The number of threads per storage device that processes SCSI commands is configurable. All target driver and storage driver functions invoked by the SCST core are asynchronous, at least when the Linux kernel allows this.
In a modern enterprise architecture disk array controllers (sometimes also called storage processors, or SPs [1]) are parts of physically independent enclosures, such as disk arrays placed in a storage area network (SAN) or network-attached storage (NAS) servers.
Symmetrix arrays, EMC's flagship product at that time, began shipping in 1990 as a storage array connected to an IBM mainframe via the block multiplexer channel.Newer generations of Symmetrix brought additional host connection protocols which include ESCON, SCSI, Fibre Channel-based storage area networks (SANs), FICON and iSCSI.
Another example of an interposer is the adapter used to plug a SATA drive into a SAS backplane with redundant ports. While SAS drives have two ports that can be used to connect to redundant paths or storage controllers, SATA drives only have a single port. Directly, they can only connect to a single controller or path.