RAID 1 and RAID 5 Tags: NAS / RAID Controller Storage Last response: July 29, 2012 5:55 AM in Storage Share rkendrick July 29, 2012 5:49:47 AM Hello, Lets say that we have an array of disks. It has n disks and is fault tolerant. RAID 1: n=2; data on the first disk is identical to the second disk. disk0=disk1 RAID 5: n>=3; all disk in the array are XOR'ed to the last disk for parity. diskn=xor(disk0...diskn-1) It is my understanding in a RAID 1 that the data on the second disk is identical to the first, also the data on the second disk is equal to the XOR of the first disk; disk1=disk0 and disk1=xor(disk0). If the second disk in a RAID 1 is identical to the parity of the first, therefore RAID 1 is a RAID 5 with only two drives. Did I come to the wrong conclusion? Also, I don't care what the standard definition of a RAID 5 happens to be. If I can get a controller to use RAID 5 with only two disks, then this is true? Regards, Ryan More about : raid raid Pinhedd a c 87 G Storage July 29, 2012 5:55:30 AM What you're describing are RAID 1 and RAID 4 RAID 5 is identical to RAID 4 except that the parity block is distributed across all disks so that each of n disks has n-1 data blocks and 1 parity block. RAID 6 is similar except that RAID 6 has n-2 data blocks on each disk and 2 parity blocks A controller with RAID 5 on only 2 disks would be identical to RAID 1 EDIT: for comparison http://en.wikipedia.org/wiki/Standard_RAID_levels m 0 l Can't find your answer ? Ask ! Publish Related resources SolvedRAID 1, 5, Or 10 For Home Server PC? Forum SolvedReccomendations for RAID config (0, 5 or 0+1?) Forum SolvedHow RAID 0 ,RAID 1 , RAID 5 and RAID 10 .. works ? Forum SolvedHelp Setting/Understanding RAID 0, 1, 5 Forum Solvedcan i have a single 1 and 3 single 1ts in raid 5. msi9900fxa-gd80 win7 ult. Forum Solvedhow to migrate RAID5 disks from DL380 G1 to DL380 G6 Forum SolvedASUS Crosshair 1 RAID 5 Drivers Forum SolvedRAID 5 back to RAID 1 -- ICH10R Forum SolvedRAID1 or RAID5 for use in WIN7? Forum I have two windows 2008 Servers (Dell Optiplex) running RAID 5 & RAID 10. The OS is installed as RAID 1 on both servers. I'm r Forum SSD + 2TB Storage + RAID5 on 4x 1TB Forum Dead desktop with 4 1TB disks in RAID 5 - how do I access them? Forum SolvedChanging from two drives in RAID 1 to four drives in RAID 5 Forum SolvedAsus P5Q Deluxe EZ Backup - Raid 1 Forum SolvedFor best data protection: Raid 1 or Raid 5? Forum SolvedHow do I move ALL data from 1 drive to 3 drives (on Raid5)? Forum SolvedMsi k9n2, six drives-3 in RAID 5, 2 in RAID 0, 1 not RAID. At startup (Windows X Forum Is it true that SSD's are not good for RAID 1 and RAID 5 and why? Forum SolvedRaid 1 vs raid 5 for images storage Forum ssd + 2xhdd raid 1 on P5E Forum More resources Read discussions in other Storage categories Hard Drives DVD Drives DVD Writers Optical Media Flash Media NAS/RAID SSD Western Digital !