2.3.5.2Stripe Size
The stripe size is the length of the interleaved data segments that MegaRAID SCSI
With disk mirroring (used in RAID 1), data written to one disk drive is simultaneously written to another disk drive, as shown in Figure 2.2.
Figure 2.2 Disk Mirroring
MegaRAID Controller
Segment 1 | Segment 1 Duplicated | |
Segment 2 | Segment 2 | Duplicated |
Segment 3 | Segment 3 | Duplicated |
Segment 4 | Segment 4 Duplicated | |
If one disk drive fails, the contents of the other disk drive can be used to run the system and reconstruct the failed drive. The primary advantage of disk mirroring is that it provides 100% data redundancy. Since the contents of the disk drive are completely written to a second drive, it does not matter if one of the drives fails. Both drives contain the same data at all times. Either drive can act as the operational drive.
Although disk mirroring provides 100% redundancy, it is expensive because each drive in the system must be duplicated.
Introduction to RAID |
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