Raid
- Thread starter Circa219
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Redundant Arrays of Independant Disks has to major levels that the average user is concernced with. Level 0 (striping) and level 1(mirroring).
Striping is more about speed increases and mirroring is more about data protection. Basically you need to hard drives that are exactly the same plugged into a raid controller. If you have striping enabled, the computer will see the two seperate hard drives as one big hard drive and will write data onto both of them at the same time (half on one half on the other). This makes data access almost double in theory (though in practice it is less than this). The downside to this is that if one harddrive fails, you loss ALL your data.
Mirroring is when the computer writes exactly the same data on both harddrives, giving you a good data back-up. If one harddrive fails, the other one steps in and just keeps going.
Striping is probably the best one to go for, as the cost per megabyte of mirroring is very expensive. However make sure you back up your serious data if u are using striping.
Striping is more about speed increases and mirroring is more about data protection. Basically you need to hard drives that are exactly the same plugged into a raid controller. If you have striping enabled, the computer will see the two seperate hard drives as one big hard drive and will write data onto both of them at the same time (half on one half on the other). This makes data access almost double in theory (though in practice it is less than this). The downside to this is that if one harddrive fails, you loss ALL your data.
Mirroring is when the computer writes exactly the same data on both harddrives, giving you a good data back-up. If one harddrive fails, the other one steps in and just keeps going.
Striping is probably the best one to go for, as the cost per megabyte of mirroring is very expensive. However make sure you back up your serious data if u are using striping.
It just depends what you do first and how you want them set up. say for example that you have a set of 10 disks that you want to set up:
-RAID 0+1:
RAID 0, then RAID 1: Divide the ten disks into two sets of five. Turn each set into a RAID 0 array containing five disks, then mirror the two arrays.
-RAID 1+0:
RAID 1, then RAID 0: Divide the ten disks into five sets of two. Turn each set into a RAID 1 array, then stripe across the five mirrored sets.
However there are no naming standards (which is incredibly stupid) so a company that says RAID 0+1 could mean either. Generally speaking though, the above is true.
-RAID 0+1:
RAID 0, then RAID 1: Divide the ten disks into two sets of five. Turn each set into a RAID 0 array containing five disks, then mirror the two arrays.
-RAID 1+0:
RAID 1, then RAID 0: Divide the ten disks into five sets of two. Turn each set into a RAID 1 array, then stripe across the five mirrored sets.
However there are no naming standards (which is incredibly stupid) so a company that says RAID 0+1 could mean either. Generally speaking though, the above is true.
crazybeans
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10 HDDs are expensive however I would love to have an array such as that. 5x in theory yet relyable, N I C E 
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