NEC Promise SuperTrak EX8350 User Manual
Also see for Promise SuperTrak EX8350: User guide
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Contents
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302. RAID LevelsThis section details the RAID levels which the disk array controller can support.2-1. Characteristics of RAID LevelsThe table below lists the characteristics of the RAID levels.Level Function Redundancy CharacteristicsRAID0 Striping No Data read/write at the highest rateLargest capacityCapacity: (capacity of single HDD) ×(number of HDDs)RAID1 Mirroring Yes Two HDDs requiredCapacity: capacity of single HDDRAID5 Striping of both data andredundant dataYes Three or more HDDs requiredCapacity: (capacity of single HDD) ×((number of HDDs) - 1)RAID10 Combination of stripingand mirroringYes Four HDDs requiredCapacity: (capacity of single HDD) × 22-2. RAID0In RAID 0, data to be recorded is distributed to HDDs. The mode is called "striping".In the figure below, data is recorded in stripe 1 (disk 1), stripe 2 (disk 2), and stripe 3 (disk 3)… in the order.Because RAID0 allows all HDDs to be accessed collectively, it can provide the best disk accessperformance.NoticeRAID 0 does not have data redundancy. If a HDD is defected, the datasaved in the HDD cannot be recovered.Disk array controllerDisk 1 Disk 2Stripe 1Disk 3Stripe 4Stripe 2Stripe 5Stripe 3Stripe 62-3. RAID1In the RAID1 level, data saved in a HDD is recorded to another HDD without change. This mode is called"mirroring".When data is recorded to a single HDD, the same data is recorded to another HDD. If either of the HDDs isdefected, the other HDD containing the same data can substitute for the defected HDD. Thus the system cancontinue to operate without interruption. |
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