Introduction to RAID controller
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Introduction to RAID controller

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In this PDF we describe the introduction of the RAID controller. We describe it using different points. Our main description of RAID controller is on the different levels. It is presented by ...

In this PDF we describe the introduction of the RAID controller. We describe it using different points. Our main description of RAID controller is on the different levels. It is presented by http://www.shopricom.com/46M0829/IBM-46M0829-M5015-SATA-SAS-RAID-Controller

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Introduction to RAID controller Presentation Transcript

  • 1. RAID means redundant array of independentdisk. It is a type of storage technology. Itcombines multiple disk component into a logicalunit. Data is distributed across several RAIDlevels.
  • 2. Redundant array of independent disk is acategory of disk drives that has two or moredrives in combination for fault tolerance. Theseare frequently used in the server. It allows youto store data in the multiple places (redundantly)to improve the storage performance.
  • 3. In the 1987 David Patterson, Garth Gibson andRandy Katz first published their research paper.Their paper name was “ A case of RedundantArrays of Inexpensive Disks”. Which helps toform the modern RAID industry. Their paperdefined 1 to 5 RAID levels. Today more levelsare defined. This technology remains vibrant asever.
  • 4. Number of standard schemes are evolved thoseare refer as levels. Originally there ware fivelevels but today it vibrantly evolved more levels.It’s level and original data format is standardizestorage networking industry association (SNIA).
  • 5. RAID means redundant array of independentdisk. It is a type of storage technology. Itcombines multiple disk component into a logicalunit. Data is distributed across several RAIDlevels.
  • 6. Different architecture are provided by RAIDfollowed by each architecture providesperformance, capacity and tolerance. Theselevels are 0, 1, 2, 3, 4, 5 and 6.
  • 7. Provides data striping (spreading out files acrossmultiple disk drives) but without redundancy. Ithighly improves the performance. In certain caseif one drive is fail then all data is lost. Data isfragmented is called blocks. Number of block isdedicated to the stripe size. It is configurationparameter of array. Block is written in the samesector simultaneously in the different drives.
  • 8. Level 1 provides the twice the read transactionrate in the same disk. Write transaction rate isalso same. Write request update the stripe ofboth drives. The array is continue to operate aslong as at one drive is operating. It has separatecontroller in each drive for simultaneously readscalled multiplexing.
  • 9. Strip data at the bit level rather than the blocklevel. In this level all disk spindle rotating in asynchronized way that each sequential bit on adifferent drive. Across these bits hamming codeis calculated.
  • 10. It provides byte level striping with a dedicatedparity disk. It can’t service simultaneously it isused rarely. Parity is calculated and stored in thededicated parity drive.
  • 11. Commonly used implementation of RAID isblock level striping with a dedicated parity disk.If disk fails then parity create a replacement.Disadvantage of it creates bottleneck.
  • 12. It provides data striping at the block level. Itperforms excellently in the good fault tolerance.It requires data and all drives but one to beoperate. Array is not destroyed in a single diskfailure. In a single disk failure it reduce theentire performance. RAID 5 requires at leastthree disk.
  • 13. It is similar to RAID 5 except instead of oneparity block per stripe. With two independentparity block RAID 6 can survive loss of two inamong the group of disk.
  • 14. RAID concept is present from in 1986 and it isinstalled in the million of configuration. It lacksof the standard. RAID implementation isproprietary and unique to every vendor.
  • 15. RAID is implemented in the server by a softwarecalled JBOD (just a bunch of disks). It acts as alogical volume manager it manage the paritycalculation.
  • 16. These are the cards that can be added to aserver and performs the offload of overloadedRAID CPU. It is a better solution for a singleserver. For managing the mirror data it CPUspend no processing power. It uses eitherinternal drives or JBOD.
  • 17. It consist of two high performance andredundant RAID controller. They supportmultiple RAID levels and different drive typesand speeds. Storage array also have snap shot,volume copy etc. There are different types ofRAID controller like IBM RAID controller.
  • 18. 188-M Technology DriveIrvine CA 92618Tel: (949) 788-9939Fax: (949) 788-9940http://www.shopricom.com