Different RAID Level Comparison Usage RAID Level

check RAID Hardware Details Command
1)#mdadm -l (or) #cat /proc/mdstat
Hardware RAID DETAILS
2)# cat /proc/mdstat | grep Raid
3)#cat /proc/drivers/cciss/cciss*
4)#cat /proc/scsi/scsi [ SCSI RAID Controller Details]
5)#lspci | grep raid #lshw #dmraid
Hardware RAID is very compatible one rather than Software RAID. Software Raid we won't get that much  efficiency.



After Configure RAID. Raid Device path will be.
/dev/cciss/c0d0p1
C-Controller 
D-Disk
P-Partition.





RAID -3 RIAD-5 RAID-6
PARITY Single Dedicated Parity Disk


Single Distributed Disk Double Distributed Disk-


Fault tolerance
No possibility for recovery 1 – disk failure 2-drive failure




Stripping Stripe data at block level Stripe at byte level


Parity main purpose is error correction and fault tolerance.


RAID-0 RAID-1 RAID-10 RAID-5 RAID-6
USAGE Video Editing Official Application





Required Min mum No of Disk 1 2 4(two disk for mirroring) 3(one Parity Disk) 4(two Parity Disk)
Total Capacity
10G *n

10G*2=20GB 10G*2=10G
Get 50% Disk Space
10G*4=20
Get 50% Disk Space
10G*6=50GB
Reduce the One Disk Space
10G*6=40GB
Reduce the two Disk space.
Advantages Improve Read & Write performance. Because while write into one disk at the same time we can write into another disk. [ audio-video Streaming Web Server]







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