AMCC 9500S 사용자 설명서

Understanding RAID Levels and Concepts

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A single drive can be configured as a unit through 3ware software. (3BM, 
3DM 2, or CLI). Like disks in other RAID configurations, single disks 
contain 3ware Disk Control Block (DCB) information and are seen by the OS 
as available units.

Single drives are not fault tolerant and therefore not recommended for high 
availability systems unless additional precautions are taken to prevent system 
hangs and data loss.

A JBOD (acronym for “Just a Bunch of Disks”) is an unconfigured disk 
attached to your 3ware RAID controller. JBOD configuration is no longer 
supported in the 3ware 9000 series. AMCC recommends that you use Single 
Disk as a replacement for JBOD, to take advantage of advanced features such 
as caching, OCE, and RLM. 

JBOD units are not fault tolerant and therefore not recommended for high 
availability systems unless additional precautions are taken to prevent system 
hangs and data loss.