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JBOD
Although a concatenation of disks (also called JBOD, or "Just a Bunch of Disks") is not one of the num�
bered RAID levels, it is a popular method for combining multiple physical disk drives into a single
virtual one. As the name implies, disks are merely concatenated together, end to beginning, so they
appear to be a single large disk.
As the data on JBOD is not protected, one drive failure could result total data loss.
Stripe Size
The length of the data segments being written across multiple hard disks. Data is written in stripes
across the multiple hard disks of a RAID. Since multiple disks are accessed at the same time, disk strip�
ing enhances performance. The stripes can vary in size.
Disk Usage
When all disks are of the same size, and used in RAID, Thecus IP storage disk usage percentage is
listed below:
100
Appendix B: RAID Basics
RAID Level
Percentage Used
RAID 0
RAID 1
1/n x 100%
RAID 5
(n-1)/n x 100%
RAID 6
(n-2)/n x 100%
RAID 10
RAID 50
(n-1)/n x 100%
RAID 60
(n-2)/n x 100%
JBOD
n: HDD number
100%
50%
100%
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