NAS (Network Attached Storage), iSCSI SAN (Storage Area Network) IP SAN and DAS (Direct Attached Storage) Servers and RAID Solutions

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  Storage - CyberStore NAS, SAN and DAS Solutions  

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We design our NAS, DAS & SAN Storage Servers around the varying needs of our customers. All the range are affordable, reliable and industry proven enclosures, perfect for any storage application. Whether implementing a DAS, NAS, Fibre Channel SAN or iSCSI SAN (IP SAN) these highly dependable chassis are rugged and reliable. Each chassis is designed to exceed the power, cooling and rotational vibration requirements of today's high speed peripherals.

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Clusters & HPC Network Attached Storage Servers are the easiest and most cost effective way of adding Storage to your network.
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One approach to scaling storage without having to scale servers at the same time is the use of NAS - Network Attached Storage - which connects directly to an IP LAN and is available to all servers - receiving, storing and returning data as files from a mix of different operating system types.

NAS is a storage appliance that stores and manages data access and retrieval on behalf of a number of IP attached Servers and Users. One of the biggest advantages of a NAS system is that it is can be attached anywhere to the network with the minimum disruption and impact on operational procedures. NAS can offer a quick and easy point solution to IT centre data storage challenges.

If you're need to increase the available Storage on your network without the cost implications of deploying a traditional File Server, we offer a range of NAS products that can be attached quickly and directly to your Ethernet Network to provide significant additional Disk Capacity at a very competitive price point. more NAS information.

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12 hot swap SATA Drive Bays to 9TB
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  CyberStore 4U
16 hot swap SATA Drive Bays to 12TB
 
 
CyberStore 5U
24 hot swap SATA Drive Bays to 18TB

Find out more about different RAID levels the we use in our Storage Products.

Typical NAS

               
Direct Attached Storage (DAS)

IP Storage Networking – An Overview

IP Storage Networking refers to computer systems and storage elements that are connected via IP. It also refers to the IP infrastructure transporting storage traffic among these targets.

Many computer systems and storage assets have native IP interfaces. These could include servers, RAID or tape libraries with an iSCSI adapter or iSCSI controller. These interfaces typically are Ethernet and include protocol processing, such as TCP/IP offload engines, to reduce processing loads on the host devices.

iSCSI Connection Devices

There a number of technology implementations offering options for connecting iSCSI. These include traditional NICs (Network Interface Cards), NICs with TOEs (TCP Offload Engines) and iSCSI HBAs (Host Bus Adapters).

iSCSI – Remote Connectivity

iSCSI can be deployed for linking SANs over MAN (Metropolitan Area Network) and WAN (Wide Area Network) environments using TCP/IP as the delivery mechanism. This is not limited to extending native iSCSI SANs but can also be used to Fibre Channel SANs leveraging existing wide area technologies as extending SANs over long distances using iSCSI requires only standard Ethernet equipment. When connecting to Fibre Channel SANs, a bridging device will be needed. Such device can be stand alone or incorporated into some Fibre Channel switches. Such functionality in Fibre Channel switches facilitates Fibre Channel to Fibre Channel switching, Fibre Channel to iSCSI IP switches and router have no equivalent functionality.

iSCSI Operation

iSCSI is based on the SCSI architecture. In the SCSI-3 implementation of the standard an initiator (typically a host system such as a server) issues requests to read or write data. A data storage resource such as a RAID sub-system responds to that request. The storage device is a target and typically responds to initiator requests to read or write. A target has one or more logical units (identified by Logical Unit Numbers – LUNs) that respond to commands from the initiator.

A command sent by an initiator (server) to a specific logical unit (target) could be a command to read a specified number of data blocks. The transfer of data to or from target’s logical unit takes place and is terminated by a status to indicate completion of the request.

The challenge for iSCSI is to encapsulate and reliably deliver SCSI commands and data between initiators and targets over TCP/IP networks. The iSCSI protocol initiative must deal with the inherent contradiction posed by the requirements of SCSI for stable, fast, deterministic communications and the potentially unreliable environment typical of IP networks.

The iSCSI protocol specification details processes for the validation of data and command exchanges and for recovery from data loss that may be inherent in the lower layer transport protocols that underpin TCP/IP transactions. iSCSI monitors the block data transfer and validates completion of the I/O operation. This occurs over one or more TCP connections between initiator and target.

An iSCSI SAN is a combination of native iSCSI initiators such as servers and iSCSI targets such as disk arrays and tape subsystems. Typically each server and storage device supports a Gigabit Ethernet interface and iSCSI protocol stack. This facilitates storage devices being connected directly into Gigabit Ethernet switches and/or IP routers where they appear as any other IP entities in the network. As with normal IP implementations, direct connection to the IP network requires responsibility for device discovery and connection establishment be undertaken by the end device. An iSCSI initiator may have multiple target devices over an IP network, and consequently multiple concurrent TCP connections can be active at the same time.

When using iSCSI, a SCSI initiator must discover storage resources typically through a list of IP addresses of its intended targets. This list can be provided by a lookup table or by a DNS type service such as the Internet Storage Name Service (iSNS). iSNS protocol facilitates device discovery for iSCSI initiators with an iSCSI initiator querying an iSNS server to learn the IP addresses of potential target resources, and then establish TCP/IP connections to them. iSNS servers can be stand alone in the network or distributed across iSCSI devices.

SCSI communication over iSCSI is defined by the SCSI Architectural Model (SAM-2) where iSCSI implements a client-server model between storage targets and initiator servers. Since iSCSI targets and initiators are on an IP network they must conform to the clients/server model and this means having a Network Entity identity which is equivalent to the IP addresses they are assigned. The Network Entity may contain one or more iSCSI devices or servers (iSCSI nodes). An iSCSI Node identifies a SCSI device within a Network Entity that is accessible through the network.

Find our more about our complete range of storage servers Direct Attached Storage is the data storage connection system which most people are familiar with.

Typically DAS is a disk drive or disk subsystem which is either in the same enclosure as the server or attached by a short heavy cable.

Direct Attached Storage (DAS) is normally connected to the server which ‘owns’ it, by a SCSI bus. There have been many technologies used to actually connect the disk to the computer: the most common are SCSI, IDE/ATA Fibre Channel and SATA.

This is typically a JBOD (Just a Bunch of Disks) configuration. Managing how the data on the disk drives is organised is under control of the server. Increasing the available storage space can mean either adding a server with its own storage to a network or bringing down a server and reconfiguring the disk system.

more DAS Information

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Typical DAS

               
Fibre Channel Storage Area Network (SAN)
A SAN (Storage Area Network) is an architecture designed to meet the requirement of networking data storage behind the server.

The SNIA (Storage Network Industry Association) definition of a SAN is: ‘A network whose primary purpose is the transfer of data between computer systems and storage elements and among storage elements. (Abbreviated SAN). A SAN consists of a communication infrastructure, which provides physical connections, and a management layer, which organises the connections, storage elements, and computer systems so that data transfer is secure and robust.’

The definition does not specifically identify the term SAN with Fibre Channel technology. When the term SAN is used in connection with Fibre Channel technology, use of a qualified phrase such as "Fibre Channel SAN" is encouraged.

According to this definition an Ethernet-based network whose primary purpose is to provide access to storage elements would also be considered a SAN - an IP SAN. Fibre Channel has become the ‘infrastructure of choice’ for SANs through its ability to deliver large volumes of information swiftly, efficiently and with predictable latencies. More recently iSCSI has emerged as an alternative which leverages the more ubiquitous IP network and broader skills base. Using IP is likely to have increasing appeal in the broader market place as Fibre Channel, historically, is seen to have a high price tag, enterprise appeal and a limited, but growing, skill base to exploit.

For more information on our full range of Fibre Channel Storage Area Network Servers please call us on 0870 460 5829 or email us info@cybernex.co.uk

Typical Fibre Channel SAN

               
iSCSI Storage Area Network (SAN) or IP SAN
Developed by the Internet Engineering Task Force, iSCSI is a technology designed to carry SCSI commands and data across an IP network.

Developed by the Internet Engineering Task Force (IETF), iSCSI is a technology designed to carry SCSI (Small Computer System Interface) commands and data across an IP network. It enables a server (initiator) to send SCSI commands and data to a storage device (target) over a TCP/IP based network (standard LAN technology) in IP packets.

With the recent development of the iSCSI protocol and silicon-based TCP/IP offload engines, SANs based on IP networks are now possible. iSCSI builds on the two most widely used protocols from the storage and the networking worlds. From the storage side, iSCSI uses the SCSI command set, the core storage commands used throughout all storage configurations. On the networking side, iSCSI uses IP and Ethernet, which are the basis for most corporate networks, and are increasingly being used for metropolitan and wide area networking as well.

An iSCSI storage area network (SAN) requires a fabric of switches that creates a SAN using standard Ethernet switches and routers to transport data over the fabric. This fabric also may include storage routers and switches that have a combination of iSCSI interfaces and other storage interfaces such as SCSI or Fibre Channel. Some Fibre Channel switches provide multi-protocol connectivity not available in conventional IP and Ethernet switches. Alternatively specifically constructed gateway devices can provide a bridge between Fibre Channel and IP infrastructures. more iSCSI SAN information

For more information on our full range of iSCSI Storage Area Network Servers please call us on 020 8997 6000 or email us info@cybernex.co.uk

               
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Cybernex Computers

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