Hard Disk Design With Large Capacity And High Bandwidth Based On Could Architecture

As an information storage component, storage unit is an important part ofelectronic system. It affects the whole system performance directly. The capacityand bandwidth are important for evaluation of the storage performance.Nowadays, storage capacity are expanding while access bandwidth areimproving. Subject to the technological level, the performance of individualhard disk or memory chip is hard to improve. For multi-chip can be used toexpand address bit and data bit of memory, this method is widely used toimprove performance at present. When expanding address bit, storage capacitycan be expanded exponentially. When expanding data bit, access bandwidth canbe enhanced with the capacity expanded. At present, most hard disks usepoint-to-point connections with exclusive bus bandwidth, which is quiteunsuitable for stacking connection so that it is very inconvenient to upgrade thehard disk capacity and expand bandwidth.Cloud is parallel processing based on virtualized resource on network.Thepaper introduces cloud architecture into hard disk design to realize parallelprocessing of hard disk nodes to upgrade its capacity and expand its bandwidth.Firstly, a stackable connected SATA hard disk is built to store virtualized resources nodes, which effectively overcomes the difficulty of stacking andconnection of hard disk. Secondly, the write-only bus and unified node interfaceUNI are abstracted from Ethernet features. Any device or port needs to connectto the write-only bus BoW by UNI. UNI is responsible for error-free transferringmessage between devices and ports to establish a network storage architecture.Then m SATA hard nodes are attached to BoW by UNI to form a SATA harddisk with single stacking and connection to realize the m-time expansion ofstorage capacity. A SATA with n-way stacking and connection can form a harddisk with large capacity and high bandwidth, which can realize M×n-timecapacity expansion and n-time bandwidth upgrading.The system is built by a Zynq-7045chip of Xilinx and ten88SE9235chipsof Marvell, with SATA hard disk as the medium nodes for storage.Each88SE9235chip connects to four SATAs to form a one-way hard disk. Then10-way hard disk can form a large capacity and high bandwidth hard disk with40storage notes by connecting to Zynq-7045chip via PCIe interfaces. Themethod can realize capacity expansion and bandwidth upgrading.The paper designs the next generation of SATA interface as external hostinterface with up-to-12.5Gb/s transfer rate. It also designs a Gigabit Ethernetinterface to improve the access capability of system network.