2010年7月8日 星期四

什麼是BeyondRAID？ 存儲沒有限制。


什麼是BeyondRAID？ 存儲沒有限制。

BeyondRAID™ 利用了傳統RAID系統的好處，而把許多的限制落後。 這種新一代的冗餘存儲技術匯集了安全性，可靠性，可擴展性，效率和易於使用。

BeyondRAID適合在同一個地方的軟件堆棧作為傳統 RAID系統之間的文件和驅動程序。 因此，可以採用 BeyondRAID沒有任何改變，基礎設施，讓您維護您的當前文件系統和操作系統，同時消除了摩擦成本通常與移動到一個新的技術平台。

與傳統的RAID問題
IT經理們面臨著複雜的問題，其中一個 11個傳統的RAID級別，他們應該為他們的業務部署存儲。 

傳統RAID患有兩個主要缺點：
1）鎖定的RAID級別的數據生命週期 
2）一間簡單主場迎戰被迫權衡安全與穩定主場迎戰擴充性 
隨著商業環境的變化隨著時間的推移，IT經理們不得不選擇購買新的RAID陣列，成本和精力的調配更合適的RAID級別。
 
BeyondRAID是RAID無怨無悔
Data Robotics BeyondRAID 解決了這兩個關鍵問題，提供靈活而停機。 建立在先進的存儲虛擬化平台，選擇正確的RAID BeyondRAID一種基於數據保護的需要在任何特定的時刻。 由於工程技術在塊級別，它可以寫入的數據塊之間輪流數據保護方法。 如果一個 IT經理需要增加存儲能力，以1 Drobo這樣的產品，他或她可以直接插入磁盤驅動器或additional replace the最小的磁盤，沒有必要改變的RAID levels，購買新的存儲 array或去通過複雜的匯集的RAID administration組。 該 BeyondRAID功能甚至允許 IT經理轉由單一到磁盤冗餘雙用一個點擊，從而確保企業級雙奇偶校驗數據保護如果需要的話。

頭對頭部與傳統的RAID
按功能特徵，BeyondRAID一貫傳統 RAID節奏。 如果你已經知道如何支援RAID 0，1，5或6操作，你就會理解的基礎，因為它的BeyondRAID依賴於相同的基礎數據保護方法，即鏡像和條紋單或雙平價。 所不同的是如何BeyondRAID交互與存儲本身。




¹可配合Drobo會將秒，DroboPro，DroboElite
²可與 DroboPro和DroboElite



What's BeyondRAID? Storage without limitations.

BeyondRAID™ leverages the benefits of traditional RAID systems, while leaving many of the limitations behind. This next-generation of redundant storage technology brings together safety, reliability, expandability, efficiency and ease-of-use.

BeyondRAID fits in the same place of the software stack as traditional RAID between the file system and the driver. Hence, BeyondRAID can be adopted without any change in infrastructure, allowing you to maintain your current file system and operating system, while eliminating the friction costs typically associated with moving to a new technology platform.

Problems with Traditional RAID
IT managers are faced with the complicated question of which one of the eleven traditional RAID levels they should deploy for their business storage. 

Traditional RAID suffers from two major disadvantages:
1) Lock-in of RAID levels for the lifecycle of the data 
2) a forced tradeoff between simplicity vs. safety and stability vs. expandability 
As business conditions change over time, IT managers are obliged to choose between purchasing a new RAID array and the cost and effort of redeploying a more appropriate RAID level.

BeyondRAID is RAID without Regrets
Data Robotics BeyondRAID solves these two critical issues, delivering flexibility without downtime. Built on an advanced storage virtualization platform, BeyondRAID chooses the correct RAID algorithm based on data protection needs at any given moment. Since the technology works at the block level, it can write blocks of data that alternate between data protection methodologies. If an IT manager needs to add storage capacity to a Drobo product, he or she can simply insert additional disk drives or replace the smallest disks—no need to change RAID levels, purchase a new storage array or go through the complex administration of pooling RAID groups. The BeyondRAID feature even allows IT managers to switch from single to dual disk redundancy with a single click, thereby ensuring enterprise-level dual parity data protection if required.

Head-to-head with Traditional RAID
Feature by feature, BeyondRAID consistently beats traditional RAID. If you already understand how RAID 0, 1, 5 or 6 operates, you’ll understand the fundamentals of BeyondRAID as it relies on the same underlying data protection methodologies, namely mirroring and striping with single or dual parity. The difference is in how BeyondRAID interacts with the storage itself.

¹ Available with Drobo S, DroboPro, DroboElite
² Available with DroboPro and DroboElite


Add-on explanation:

Drobo BeyondRAID

Data Robotics, Inc. implements a storage technology that they call BeyondRAID in their Drobo storage device. While not a true RAID extension, it does provide for using up to 8 SATA hard drives in the device and consolidating them into one big pool of storage. It has the advantage of being able to use multiple disk sizes at once, much like a JBOD unit, while providing redundancy for all disks and allowing a hot-swap upgrade at any time. Internally it uses a mix of techniques similar to RAID 1 and RAID 5. Depending on the amount of data stored on the unit in relation to the installed capacity, it may be able to survive up to three drive failures, if the "array" can be restored onto the remaining good disks before another drive fails. The amount of usable storage in a Drobo unit can be approximated by adding up the capacities of all the disks and subtracting the capacity of the largest disk. For example, if a 500, 400, 200, and 100 GB drive were installed, the approximate usable capacity would be 500+400+200+100-(500)=700 GB of usable space. Internally the data would be distributed in two RAID 5-like arrays and one RAID 1-like set:
Drives
 | 100 GB | 200 GB | 400 GB | 500 GB |

                            ----------
                            |   x    | unusable space (100 GB)
                            ----------
                   -------------------
                   |   A1   |   A1   | RAID 1 set (2× 100 GB)
                   -------------------
                   -------------------
                   |   B1   |   B1   | RAID 1 set (2× 100 GB)
                   -------------------
          ----------------------------
          |   C1   |   C2   |   Cp   | RAID 5 array (3× 100 GB)
          ----------------------------
 -------------------------------------
 |   D1   |   D2   |   D3   |   Dp   | RAID 5 array (4× 100 GB)
 -------------------------------------
With the introduction of the DroboPro, a RAID6 like feature was also introduced. BeyondRaid also has the ability to perform hash-based compression using 160-bit SHA1 hashes to maximize storage efficiency.
Detailed technical information about BeyondRaid, including how it handles adding and removing drives, can be found in the patent application at the US Patent Office. 

http://en.wikipedia.org/wiki/Non-standard_RAID_levels
http://en.wikipedia.org/wiki/Standard_RAID_levels
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