Fault Tolerance and Disaster Recovery

[DwinHell]

Hello friends,

I am facing some issue where i am trying to spread data over multiple disk drives to improve performance. Over where data are interleaved by bytes or blocks of bytes across the drives. My question is which method of fault tolerance is the least expensive per mb of storage, disk duplexing or disk striping with parity? Does anyone know about it.

[Crona]

Always remember that raid 0 = stripping is NOT fault tolerance. It only combines the two or more drive and then breaks up the data into little parts and spread them across all drives. This is for speed advantages only. If any one of the drive bites the dust the whole array is a goner. For fault tolerance raid level starts with Raid 1 and up and for least cost per mb, i think you need to start with RAID 1 and over here there are only 3 drives if one fails then you can rebuild it from parity drive.

[Harshini]

I think RAID 5 with the parity will consume about 1/3 of the disk your space but at the same time it will give you highest level of fault tolerance. Where as RAID0 will give you the full disk space but no fault tolerance. RAID 1 will give you full redundancy but will cost 50% of your disk space and RAID 5 will do block of level striping with parity data , disk space cost about 30%, redundant

[microam_i]

For more information on which method of fault tolerance is the least expensive per mb of storage, disk duplexing or disk striping with parity , i would suggest you to check out the below link because it will explain you each and everything in detail.

Networking Guide 8 - Fault Tolerance and Disaster Recovery