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JBOD or RAID5?

Last response: in Storage
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July 28, 2011 7:35:25 PM

Hi guys, I am kind of confuse between JBOD and RAID5 even after searching on the net. Below is what I understood so far, please help me out and correct me if I am wrong :) 

JBOD (same as Linear?)

1) If I have 3X 2TB HDD, it will become roughly 6TB HDD
2) If the 2nd HDD fail, all 3 HDD will stop working because the array is stop?
3) Even if the defective HDD is replaced, I am forced to format all 3 HDD because it can not be recover?

RAID5

1) If I have 3X 2TB HDD, only 4TB is usable because one of the HDD is used for the parity?
2) If the 2nd HDD fail, the remaining HDD will still work normally because RAID5 allow one disk fail?
3) After the defective HDD is replaced and recovered, only the data on the defective HDD will be lost? the data on the other HDD will not be lost?

Thanks in advance!

More about : jbod raid5

a c 93 G Storage
July 28, 2011 9:21:30 PM

JBOD (Just a Bunch Of Disks): is an array of drives without any additional control (accessed simply as independent drives)

RAID0 (also known as a stripe set or striped volume) splits data evenly across two or more disks (striped) with no parity information for redundancy. One drive fails data is gone.

RAID1 creates an exact copy (or mirror) of a set of data on two or more disks. if one disk of the mirror fails data is still save. replace bad disk fast.

RAID5 uses block-level striping with parity data distributed across all member disks. RAID 5 has achieved popularity because of its low cost of redundancy. This can be seen by comparing the number of drives needed to achieve a given capacity. Minimum three drives needed as long only one drive fails data is still save. replace bad disk fast.

http://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_...


RAID 0+1 (also called RAID 01), is a RAID level used for both replicating and sharing data among disks.[3] The minimum number of disks required to implement this level of RAID is 3 (first, even numbered chunks on all disks are built – like in RAID 0 – and then every odd chunk number is mirrored with the next higher even neighbour) but it is more common to use a minimum of 4 disks. The difference between RAID 0+1 and RAID 1+0 is the location of each RAID system

http://en.wikipedia.org/wiki/Nested_RAID_levels
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a b G Storage
July 28, 2011 9:31:29 PM

Polyway.

JBOD is Just a Bunch of Drives, it mean there are multiple drives you see and access a once.

Where combine feature is BIG or SPAN...

I recommend not do any business the sellers/manufactures, who lists BIG/SPAN as JBoD.

I would not trust these sellers/manufacture, because they DON'T even know the different between JBOD and BIG/SPAN function.

Here is good articel about raid:
http://www.tomshardware.com/forum/259807-32-raid
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