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 TitleDate AddedCompany
whitepaper The Mathematics of RAID-62008-07-02 Zytor
  RAID-6 supports losing any two drives. The way this is done is by computing two syndromes, generally referred P and Q. The algebra used for this is the algebra of a Galois Field, GF(28). A smaller or larger field could also be used, however, a smaller field would limit the number of drives possible, and a larger field would require extremely large tables. GF(28) allows for a maximum of 257 drives, 255 (28 - 1) of which can be data drives; the reason for this is shown in the paper.

Tags: Storage Management		   
whitepaper Undetected Disk Errors in RAID Arrays2008-07-01 IBM
  Though remarkably reliable, disk drives do fail occasionally. Most failures can be detected immediately; moreover, such failures can be modeled and addressed using technologies such as RAID (Redundant Arrays of Independent Disks). Unfortunately, disk drives can experience errors that are undetected by the drive - which the paper refers to as Undetected Disk Errors (UDEs). These errors can cause silent data corruption that may go completely undetected (until a system or application malfunction) or may be detected by software in the storage I/O stack. Continual increases in disk densities or in storage array sizes and more significantly the introduction of desktop-class drives in enterprise storage systems are increasing the likelihood of UDEs in a given system.

Tags: Storage Management, Hard Drives		   
whitepaper Infortrend Works With Wayi to Start a New Page for Online Games2008-06-06 Infortrend Technology
  Wayi International is Taiwan's leading developer of online games. In the operation of an online game company, information system is a vital element. To produce a successful game, powerful and reliable servers and storage systems are both indispensable. Therefore, their purchase decision should be carefully made. Their IT staff has dedicated much to comparing different hardware equipments. They expect to find the servers and storage systems with good price/performance ratio, manageability and reliability. Wayi International deployed Infortend's EonStor A12F-G2422 which is a 2U, 12-bay, FC-to-SATA RAID subsystem. It provides 4Gb FC host channels and supports 12 SATA-II drives for large capacity.

Tags: RAID, Storage Management		   
whitepaper EonStor Boosts Low-Delay HD Streaming for Digistor Production Facilities2008-05-26 Infortrend Technology
  Digistor focuses on supplying professionally supported solutions for the creation, management, storage, and delivery of digital media. Its extensive services and solutions also include the realms of enterprise network, government, and education. The company wanted multiple and simultaneous HD streams with reliable data distribution. Digistor deployed Infortrend RAID subsystems exclusively in their SANman storage solutions. SANman is the trusted name in performance RAID solutions in Australia for all applications including broadcast video, security and medical imagery. Whether connected to a single computer or sophisticated shared workgroup SAN environment, SANman RAIDs with Infortrend deliver unbeatable manageability, compatibility, reliability, performance and scalability.

Tags: Storage Management, SANs		   
whitepaper The New Foundation of Storage: Xiotech's Intelligent Storage Element2008-05-01 Xiotech
  For the last several decades the underlying elements of data storage--disk drives, drive enclosures, and controllers--have remained more or less the same, and have been unable to keep pace with dramatically changing business requirements. Xiotech offers a fresh approach with its Intelligent Storage Element (ISE): A storage foundation that sets new standards for reliability, performance, and scalability. Read this paper to learn more about ISE and how it can help you.

Tags: RAID, Storage Management, Hard Drives, Storage Consolidation		   
whitepaper A New Minimum Density RAID-6 Code With a Word Size of Eight2008-04-01 University of Tennessee
  RAID-6 storage systems protect k disks of data with two parity disks so that the system of k + 2 disks may tolerate the failure of any two disks. Coding techniques for RAID-6 systems are varied, but an important class of techniques are those with minimum density, with an optimal combination of encoding, decoding and modification complexity. The word size of a code impacts both how the code is laid out on each disk's sectors and how large k can be. Word sizes which are powers of two are especially important, since they fit precisely into file system blocks. Minimum density codes exist for many word sizes, with the notable exception of eight. This paper fills that gap by describing new codes for this important word size.

Tags: Storage Management		   
whitepaper ASM and Multipathing: Generic Best Practices and Information Matrix2008-03-01 Oracle
  In this competitive business climate, well-planned business continuity strategies must include redundancy to ensure server resources are able to access storage devices even in the event of a failure. Disks and controllers can fail, and data paths can become congested resulting in bottlenecks or can fail entirely cutting off access to key information. Storage RAID technologies are great solutions for providing high availability for storage devices (disks), however, they do not address the physical path between the server and storage. If there is only a single path from the server to storage and one component fails, no amount of disk redundancy can keep the data available.

Tags: Storage Management		   
whitepaper DON'T USE: Inside the EqualLogic PS Series iSCSI Storage Arrays2008-02-01 Dell
  Storage management is at the center of an increasingly complex IT problem. Applications continually demand more from their storage systems - as performance, capacity, availability, backup, and disaster recovery needs intensify, so do expectations of the servers and storage that support them. As a result, IT professionals need a storage solution that integrates a full complement of high-end management capabilities, includes data protection, and operates intelligently. They need a reliable storage system that expands transparently and provides consistent data availability regardless of the server configuration, OS, or application. The EqualLogic PS Series of Internet SCSI (iSCSI) storage arrays offers a fundamental change in the way enterprises think about purchasing and managing storage.

Tags: Storage Management		   
whitepaper A Tutorial on Reed-Solomon Coding for Fault-Tolerance in RAID-Like Systems2008-01-01 University of Tennessee
  It is well-known that Reed-Solomon codes may be used to provide error correction for multiple failures in RAID-like systems. The coding technique itself, however, is not as well-known. To the coding theorist, this technique is a straightforward extension to a basic coding paradigm and needs no special mention. However, to the systems programmer with no training in coding theory, the technique may be a mystery. Currently, there are no references that describe how to perform this coding that do not assume that the reader is already well-versed in algebra and coding theory. This paper is intended for the systems programmer. It presents a complete specification of the coding algorithm plus details on how it may be implemented.

Tags: Storage Management, Programming Languages		   
whitepaper On Application-Level Approaches to Avoiding TCP Throughput Collapse in Cluster-Based Storage Systems2007-11-16 Association for Computing Machinery
  Cluster-based storage systems are becoming an increasingly important target for both research and industry. These storage systems consist of a networked set of smaller storage servers, with data spread across these servers to increase performance and reliability. Building these systems using commodity TCP/IP and Ethernet networks is attractive because of their low cost and ease-of-use and because of the desire to share the bandwidth of a storage cluster over multiple compute clusters, visualization systems, and personal machines. In addition, non-IP storage networking lacks some of the mature capabilities and breadth of services available in IP networks. However, building storage systems on TCP/IP and Ethernet poses several challenges. This paper discusses approaches to addressing an important barrier to high-performance storage over TCP/IP: the Incast problem.

Tags: RAID, Storage Management		   


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