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which RAID level is good for different HDD size?
- Thread starter ashand
- Start date
Solution
drtweak
Illustrious
- Sep 17, 2012
- 6,343
- 75
- 38,640
Really since you have two of each drive all you can do is RAID 1/0 Each set. A RAID 1 gives you redundancy if a drive failes (IT IS NOT A BACKUP! IF ONE DRIVE GETS CORRUPTED SO DOES THE OTHER!) and RAID 0 gives you twice the size but if one drive failes all data is lost.
So really all you can do is RAID 1 3TB RAID 1 1TB. You get better Read performance on a RAID 1 but not so much write.
Any other RAID (RAID 5 or 6) Would result in you losing a LOT of space since, yes you can mix and match drive sizes, but if you RAID 1 or 0 a 2TB and a 1TB you pretty much lose 1Tb of space on the 2Tb since they are not the same size. It is what ever the size of the smallest Drive is.
So example. RAID 5 i what they call N-1 on drive space because the space you get is all the drives combined minus 1 (A paritiy drive) so if you have 4 3TB is it 9TB you get not 12TB. But if you RAID 4 lets say a 1TB, 1.5 TB and 2 2TB's you don't get 5.5 or 5 or whatever if you add them up, you get the smallest size of the drive minus 1. So it would use only 1Tb on the 1.5 and 1 on the 2Tb's so you only get 3TB total.
ANY RAID is the same. RAID 1,0,5,6,01,10,50,60 doesn't matter. You can mix and match but what ever the size of the smallest drive is is what you base the total size off of.
So really all you can do is RAID 1 3TB RAID 1 1TB. You get better Read performance on a RAID 1 but not so much write.
Any other RAID (RAID 5 or 6) Would result in you losing a LOT of space since, yes you can mix and match drive sizes, but if you RAID 1 or 0 a 2TB and a 1TB you pretty much lose 1Tb of space on the 2Tb since they are not the same size. It is what ever the size of the smallest Drive is.
So example. RAID 5 i what they call N-1 on drive space because the space you get is all the drives combined minus 1 (A paritiy drive) so if you have 4 3TB is it 9TB you get not 12TB. But if you RAID 4 lets say a 1TB, 1.5 TB and 2 2TB's you don't get 5.5 or 5 or whatever if you add them up, you get the smallest size of the drive minus 1. So it would use only 1Tb on the 1.5 and 1 on the 2Tb's so you only get 3TB total.
ANY RAID is the same. RAID 1,0,5,6,01,10,50,60 doesn't matter. You can mix and match but what ever the size of the smallest drive is is what you base the total size off of.
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