RAID CONCEPT

RAID Concepts Engenio Storage Group Internal RAID 2008

RAID Concepts ,[object Object],[object Object],[object Object],[object Object],[object Object]

What is RAID? ,[object Object],[object Object],[object Object],[object Object],[object Object]

RAID Level Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RAID 0 - Striping ,[object Object],[object Object],[object Object],Definition No Fault Tolerance Minimum 1 / Maximum 64 Drives ,[object Object],[object Object],Uses ,[object Object],Drawbacks ,[object Object],[object Object],Benefits

RAID 1: Mirroring ,[object Object],[object Object],Definition Yes Fault Tolerance 2 Drives ,[object Object],[object Object],Uses ,[object Object],[object Object],Drawbacks ,[object Object],[object Object],Benefits

RAID 5 : Striping with Rotational Parity ,[object Object],[object Object],Definition Yes Fault Tolerance Minimum 3 Drives ,[object Object],[object Object],Uses ,[object Object],[object Object],Drawbacks ,[object Object],[object Object],Benefits

RAID 10 : Spanning two RAID 1’s Spanning two RAID 1’s - writing duplicate data to more than one pair of drives to protect against data loss in the event of a up to two disk failures (one per array) Definition Yes Fault Tolerance Minimum 4 / Maximum 16 Drives ,[object Object],[object Object],Uses ,[object Object],[object Object],Drawbacks ,[object Object],[object Object],Benefits

RAID 50 : Spanning two RAID 5’s Data is “striped” across multiple drive groups (super drive group). For data redundancy, drives are encoded with rotated XOR redundancy. RAID 50 provides the features of both RAID 0 and RAID 5. RAID 50 includes both parity and disk striping across multiple drives. Definition Yes Fault Tolerance Minimum 6 Drives RAID 50 works best when used with data that requires high reliability, high request rates, and high data transfer and medium to large capacity. Uses Requires at least twice as many parity drives as a single RAID 5. Drawbacks RAID 50 provides high data throughput, data redundancy, and very good performance. Benefits

RAID 0+1 Enhanced Mirroring The controller combines the performance of data striping (RAID 0) and the fault tolerance of disk mirroring (RAID 1). Data is striped across multiple drives and duplicated on another set of drives. Definition Yes Fault Tolerance Minimum 4 Drives If a drive fails, the controller uses the parity drive to recreate all missing information. Uses Requires half the available disk space for data redundancy, the same as RAID level 1. Drawbacks Optimizes for both fault tolerance and performance. Provides excellent performance for all data needs. May be simultaneously used with other RAID levels in an array. Benefits

RAID 1E Enhanced Mirroring ,[object Object],[object Object],Definition Yes Fault Tolerance Minimum 3 Drives ,[object Object],[object Object],Uses ,[object Object],Drawbacks ,[object Object],[object Object],Benefits

JBOD: Single Drive Control No Fault Tolerance ,[object Object],Uses ,[object Object],Drawbacks Single drive control - the ability to combine odd size drives using all of the capacity of the drives. Benefits

RAID 6 : Striping with Dual Rotational Parity ,[object Object],[object Object],Definition Yes Fault Tolerance Minimum 3 Drives ,[object Object],[object Object],Uses ,[object Object],[object Object],Drawbacks ,[object Object],Benefits

RAID Level Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RAID CONCEPT

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RAID CONCEPT