Can someone explain the physical architecture of RAID 10 in complete layman's terms? [duplicate]
I am a newbie in the world of storage and I am having a hard time digesting the physical architecture of some of the RAID levels. I am particularly interested in RAID 10, and 50. I asked the question specifically about RAID 10, because I feel if I understand that, I'll understand the other.
So, I get the definition of RAID 10 - "minimum 4 disks, a striped array whose segments are mirrored". If I've got 4 disks and Disks 1 and 2 are a mirrored pair, and Disks 3 and 4 are a mirrored pair - where does the data get striped?
Thanks.
In the following A, B, C, D area pieces of data.
RAID 0:
DISK1 DISK2
A B
RAID 1:
DISK 1 DISK2
A A
RAID 10:
DISK 1 DISK2 DISK3 DISK4
A A B B
RAID 5: (p is parity, recovery information)
DISK 1 DISK2 DISKn
A B p
RIAD 50: (p and q are parity, it's two of the above side by side...)
DISK 1 DISK2 DISKn DISK4 DISK5 DISKm
A B p C D q
The Wikipedia RAID article has much more information and pretty pictures.
http://en.wikipedia.org/wiki/File:RAID_10.png
you have 2 raid 1 that go together into a raid 0 - raid 10.
look at this article as well - describes also the benefits etc. about it.
http://www.linux-mag.com/id/7928?hq_e=el&hq_m=1151565&hq_l=4&hq_v=bf05dd41dc