This paper proposes a server-free backup model deploy on Content Aware Storage System (CASS). The CASS is a
new type information storage system which consists of three layers. In the middle is content management control layer
which is the core layer of the storage system. Compare with host based, LAN based and LAN-Free backup model, this
work design a series of models to fulfill server-free backup solution. Thos models includes backup task detective,
detective agent, query backup activate condition, semantics derivation, storage resource balancer, de-duplication, copy
agent. This server-free backup model not only speeds up the backup operation, but also off-loads the LAN and host
computer, ensuring optimum performance and continuous data access on the network.
This research proposes a new Storage Data Gateway (SDG) on Content Aware Storage System
(CASS). The CASS consists of storage application service, content auto-tiering storage; management and
control sever which is the Content Management Server (CMS). The system gives each stored object a
unique content address, derived from the content itself. The physical location of stored information
becomes irrelevant to users. The CMS takes advantage of the tier data architecture and decides data
migration strategists. But the CMS will be overload if the system assigns the backup and data migration
work to it on LAN-based model. That server does not need to control each data duplication or migration. It
will be free with Sever-free model. The system needs some special device to transfer data between highspeed
storage node and low-speed storage node and intermix FC storage node and IP storage node with
content information instead of the responsibility of CMS like on LAN-based model.
That device is a new type of SDG which needs content aware, high bandwidth, strong computing ability,
and high reliability. According to those requirements, we design the Content Aware SDG (CA-SDG) based
on ATCA specifications.
Advanced Telecommunications Computing Architecture (ATCA) is a new series of PICMG
specifications, targeted to requirements for the next generation of carrier grade communications equipment.
This series of specifications incorporates the latest trends in high speed interconnect technologies, next
generation processors and improved reliability, manageability and serviceability.
The hardware system of CA-SDG consists of two compute units (one unit deal with commands from
CMS, the other interpreter data between storage nodes), two network switch units (one is redundant), two
network interface units (one group units interconnect application service layer, and the other group provide
the communication of heterogeneous storage nodes), one local storage unit and one manager unit. The
network switch units and compute units make up of a dual star switch network. Network interface units and
local storage units which are in the form of AMC card connect Compute unit through PCI-E bus, supplying
extended network interface and local storage capacity to compute unit. The manager unit is responsible for
the management of whole CA-SDG device.