Apresentação em tema: "Levando a arquitetura RAID a uma nova dimensão “nnnnn”"— Transcrição da apresentação:
1Levando a arquitetura RAID a uma nova dimensão “nnnnn” Apresentando RAIDnLevando a arquitetura RAID a uma nova dimensão “nnnnn”RAIDn truly represents a revolutionary approach to storage reliability, one that will ultimately alter the enterprise storage landscape.
2Arquitetura Atual de Proteção de Dados RAID 5 (Striping & Paridade)Proteção contra falha de um só discoMesmo com um disco em hot spare, o storage fica em uma situação crítica com o RAID 0 devido ao longo tempo de rebuildRAID 0+1 (Striping & Espelhamento)Caso ocorra a falha em um disco em cada grupo todo sistema é perdidoSolução de Alto CustoRAID 1+5 (Espelhamento, com Stripe e Paridade)Melhor se comparado com o RAID 0+1, porém, de alto custo!!First, a little background:RAID storage configurations have proven to be the best hedge against the possibility of a single drive failure within an array. As the demand for 7x24 file access has grown and databases have become larger, traditional RAID storage technologies have been pushed to provide protection against the possibility of more than one disk drive failing at the same time (which happens with some frequency). Today, the ultimate protection available still has limitations.RAID 5 striping with parity is a “balanced cost” solution widely used today, but provides very limited protection against disk drive failures, even with hot standby spares.Although the most costly, mirroring data on separate drives (RAID 1), means that if one drive fails, critical information can still be accessed from the mirrored drive. Typically, RAID 1 involves replicating all data on two separate “stacks” of disk drives on separate SCSI channels, incurring the cost of twice as many disk drives. There is a performance impact as well, since data must be written twice, consuming both RAID system and possibly server resources. Performance is improved by striping information across the drives in each mirrored stack (RAID 1+0). However, this configuration still collapses if a single drive is lost in each stack.Adding parity (RAID 1+5) allows each mirrored stack to recover from a single drive failure. Typically, a global spare is available on which to rebuild regenerated data.Even with this costly mirroring and adding extra drives, an expensive RAID 1+5 configuration provides data protection against the lost of only three random drives.The consequences of a multiple-drive failure can be devastating. Typically, if more than one drive fails, or a service person accidentally removes the wrong drive when attempting to replace a failed drive, the entire RAID storage system is out of commission. Access to critical information is not possible until the RAID system is re-configured, tested and a backup copy restored. Transactions and information written since the last backup may be lost forever.
3RAIDn – A mudança no Paradigma Low CostRAIDn é excelente opção para a já obsoleta arquitetura RAID atual, com mais capacidade, custo e confiabilidadeRAIDnRAIDnRAIDn é uma nova solução para proteção contra falhas de múltiplos Discos.RAIDn changes everything. Trade-offs between reliability, storage capacity and cost will be dramatically reduced, and highly reliable storage will be affordable by everyone. RAIDn eliminates the danger of downtime due to multiple disk drive failures in storage arrays. It allows customers to select the level of protection desired. With RAIDn, users can uniquely protect critical information against the random failure of tens of drives, not just the maximum three drive failures possible in today’s high-end systems. Unlike other attempts to achieve higher levels of reliability, with RAIDn there is virtually no performance cost. In short, RAIDn is the storage “insurance” technology of the future.Solução Atual de Storage RAIDHigh CapacityAlta Disponibilidade
4RAIDn – A mudança no Paradigma RAIDn oferece a mesma proteção contra falhas de múltiplos discos (ex, três) como um RAID 1+5, porém, com uma redução de custos entre % (precisa de menos discos)!RAID 1+5 (consiste de “n” discos)RAIDn = n/2 + 2CustoPara a mesma capacidade de Dados e ConfiabilidadeRAIDn affords equal protection against multiple drive failures as RAID 1+5, but at about half the price!
5RAIDn – A mudança no Paradigma E com o mesmo custo, e igual proteção contra falhas em três discos, com a solução RAIDn é fornecido o dobro da capacidade!RAID 1+5*RAIDn = n – 3 DiscosCapacidadePara a mesma capacidade de Dados e ConfiabilidadeFor the same cost and level of reliability, RAIDn provides almost twice the data storage!*With a data capacity of n/2-1 drives
6RAIDn – A mudança no Paradigma Ou pelo mesmo custo e capacidade, RAIDn oferece maior confiabilidade, aumentando a quantidade de discos que podem falhar!RAID 1+5RAIDn = n/2 + 1Para a mesma capacidade de Dados e ConfiabilidadeQuantidade de Discos que podem falharAnd when cost and data capacity are equivalent, RAIDn dramatically increases the number of sustainable disk drive failures!
7RAIDnSegurança para aplicações de missão crítica, e falha de múltiplos discosMelhor proteção, se comparada com a arquitetura RAID 1+5Alta performance de leitura; equivale a performance de escrita do RAID 5Baixo Custo (necessita de quantidade menor de discos)Extensive research and development by LAND-5 has resulted in a set of software and hardware algorithms that augments RAID storage by performing automatic, transparent recovery from multiple drive failures without interrupting ongoing operations. These patented algorithms allow users to select the degree of disk-loss insurance desired. Continued operations are possible even in the event of N-1 drive failures. If a disk RAID array system has a total of N drives, the all but one (i.e., N-1) could theoretically be lost and the system could still function, assuming the remaining drive had sufficient capacity to hold all parity and user data.Our next generation RAIDn technology consists of a series of Linux software matrix array formulas. It involves breakthrough algorithms for accomplishing XOR calculations (which are the basis of RAID 5). The LAND-5 solution dramatically alters the reliability of RAID storage by circumventing previous limitations on the number of permissible drive failures.Because of its inherent architecture, RAIDn read performance is at a RAID 0 (striping) level. And R uses all disk drives for performance - there is no need for idle spare drives in a “hot standby mode.” Write performance is generally equivalent to a RAID 5 level.As will be seen, R requires far fewer disk drives to provide the same level of insurance against drive failure as today’s conventional RAID methodologies.
8Exemplo - RAID 1+5RAID 1+5 precisa de 10 Discos para proteger os dados de 4 Discos:Grupo #1Dados CríticosParidadeGrupo #2Espelho (Cópia)DadosStripingToday, the ultimate protection for critical information is accomplished through RAID1 (mirroring), overlaying RAID 5 (striping with parity) and then adding a global hot spare. For example, if user data consumes four disk drives, then reliability is improved by replicating this data on a second “stack” of four drives. Within each stack, however, losing just one drive would make the whole database useless. To further enhance reliability, each mirrored stack can be configured as an individual RAID 5 system. Since implementing parity requires an additional drive, user data and parity information are now striped across five drives within each stack. This provides protection against the loss of a single drive within each stack. So, from an original database that required just four drives, this RAID configuration has grown to include:4 drives for the original data4 drives for the mirrored data1 parity-drive (equivalent) for each stack (2 total)Thus, six drives have been added to protect data on the four (original) drives. This configuration can recover from a failed drive in either stack. Even if all the drives in one stack failed, the remaining drives in the surviving stack would still provide access to critical data. However, in this case, only one drive failure in the remaining stack could be tolerated and performance is at a degraded level. Overall, if multiple drive failures occur within each stack, access to the database is lost. Barring a total stack failure, its maximum protection is against the failure of three drives, but in a limited fashion.Portanto, oferece proteção limitada contra falha de múltiplos Discos.
9Exemplo - RAIDnUtilizando os mesmos 10 Discos, a arquitetura RAIDn precisa de apenas 3 Discos para proteger os dados de 7 Discos:ParidadeDadosStripingLooking at the same example using 10 drives, LAND-5’s next generation RAIDn technology achieves equal protection against 3 multiple drive failures protection but gives yields (3) more drives for actual data storage. It also protects against the failure of any three random drives, not just specific cases.
10Exemplo - 500GB de Dados Características RAID 1+5* RAIDn Total # DiscosRequeridos:Maximo # Grupo 1 & Qualquer GrupoSustentada Disco no randomicoFalhas grupo espelhado DiscoCusto* $34,800 $18,600Ganho $16,200Consider the example of a mission-critical database requiring 500GB of information. The ultimate RAID protection available today is RAID 1+5, where the data is mirrored and each stack is striped and has parity added. Let’s say a global spare is added as well. This provides protection against the failure of all drives or a channel in one stack, plus the failure of a single drive in the second stack. The failure of a second drive in the surviving stack would crash the storage system.LAND-5’s technology does not require mirroring data. It only needs one parity drive for each level of failure insurance desired. This example provides protection against the failure of any three random drives. Thus, only 31 drives are needed to provide superior protection under our technology compared to the 58 drives required for RAID At a $600 per drive, this represents a savings of $16,200.Because RAID 1 solutions are so costly, many databases rely strictly upon RAID 5 with striping and parity for protection against drive failure. However, RAID 5 supports continued operation only in the event of a single inoperable drive at any one moment. Losing two or more drives under RAID 5 brings operations quickly to a halt. For the cost of adding just one more drive, RAIDn technology mitigates the risk of data loss by providing the means to sustain up to two drive failures.LAND-’s breakthrough technology, however, can support continuous operation even in the event several drives fail. Thus far, LAND-5 has successfully tested recovery when 50 percent of the disk drives fail. With our next generation RAID, Network Administrators can manually assign the level of desired drive-failure protection. In short, our technology allows the user the flexibility of selecting the level of drive-failure protection to fit specific needs.* Baseado no custo de um Disco Rígido de 18GB a um preço de $600 cada (EUA).
11Níveis Dinâmicos de Proteção No exemplo anterior, é apresentado a flexibilidade do RAIDn em permitir upgrade dinâmico contra falhas no disco, simplesmente adicionando-se outro disco de paridade:Para proteção Contra: Adicione: Custo:4-Discos com falha 1 Disco a mais +$ 6005-Discos com falha 2 Discos a mais +$1,2006-Discos com falha 3 Discos a mais +$1,800Etc Etc Etc.Na arquitetura RAID atual set-up de discos é fixado na configuração inicial.Looking at previous example, Next Generation RAID will even allow you to increase the level of protection simply by adding another drive and dialing in the next highest level (via software)This is impossible with traditional RAID.
12RAIDn também ofereceOs níveis RAID de hoje (0, 1, 4 & 5) – o usuário pode fazer upgrades dinamicamente para níveis de maior proteção.Conversão dinâmica de um nível RAID para outroExpansão dinâmica do storageExtensive research and development by LAND-5 has resulted in a set of software and hardware algorithms that augments RAID storage by performing automatic, transparent recovery from multiple drive failures without interrupting ongoing operations. These patented algorithms allow users to select the degree of disk-loss insurance desired. Continued operations are possible even in the event of N-1 drive failures. If a disk RAID array system has a total of N drives, the all but one (i.e., N-1) could theoretically be lost and the system could still function, assuming the remaining drive had sufficient capacity to hold all parity and user data.Our next generation RAID technology consists of a series of Linux software matrix array formulas. It involves breakthrough algorithms for accomplishing XOR calculations (which are the basis of RAID 5). The LAND-5 solution dramatically alters the reliability of RAID storage by circumventing previous limitations on the number of permissible drive failures.
13RAIDn Oferece uma substituição completa para o RAID via Linux Será incorporado no bundle com o Inostor IceNAS softwareFacilmente transportado para outras plataformas operacionaisIdeal para implementação em controladoras (hardware) de alta-performance (licenciamento).Because it is written entirely in C and the RAIDn algorithms reside in a dedicated library, RAIDn is transportable to other operating systems and competitive NAS software.Our Linux implementation resulted in a RAIDn driver that replaces the entire Linux RAID code with a more efficient, higher-performance solution that can propel Linux into enterprise-level RAID storage.LAND-5 will include RAIDn in its iceNAS software for network attached storage solutions.RAIDn’s inherent architecture makes it an ideal embedded solution for hardware RAID controllers using XOR gates.
14Proteção e Segurança de dados para um: Online Millennium RAIDnRAIDn represents a true paradigm shift in RAID storage technology that benefits any application requiring high data integrity.
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