When is a computer’s hard disks referred to as Just a Bunch of Disks? Differentiate between RAID and JBOD? Which one is a better option for storage and why? What is spanning technique used in JBOD? Why IS JBOD referred to as a risky option? What are the advantages of JBOD?
Hello Ayannahana, first of all let's see what RAID offers:-
RAID broken up the files in multiple parts ad save them on multiple disk. The problem is that same data can store on multiple disks also. For example suppose the file size is 200 kilobytes, Then it breaks up in 10 parts of 20 kb each. Now these parts saves on alternate disks and same part can save on two disks also, Which results in repetition of data.
Now look at JBOB:-
Its work in a straight manner. In JBOB files are not spitted, They are saved on JBOB closure, That's why it called Just a bunch of disks.
The problem in JBOB is that if any disk corrupt, You will lose whole data, if you have not saved that on any other location.
JBOD is the short term for “Just a Bunch Of Disks” and sometimes “Just a Bunch Of Drives”. It is an array or group of hard drives that have not been configured yet according to the RAID system. RAID, on the other hand, is the short term for Redundant Array of Independent Disks.
Though with JBOD disks appear to be a single one, this is done by merging the disks into one bigger logical drive. This means every drive is presented, probably to a server, without applying any structure, pooling, or amalgamation. An additional configuration that volume managers can apply to JBOD is called spanning or concatenation.
With spanning, it combines or merges JBODs into bigger logical volumes or the one the called LUNs or Logical Unit Numbers. The term JBOD is extensively used on computers that have software volume management like LVM [HP-UX, AIX, and Linux], DiskSuite [Solaris], ZFS [Solaris], Veritas Volume Manager [UNIXes], Microsoft Windows, and others.
