I want to set up RAID-10 on 4 400 GB drives, on a not-so powerful
machine (600 MHz ARM, Thecus n4100) - to have a total of 800 GB storage,
with some protection against a drive failure.
As the machine is not very powerful, I don't want to use RAID-5 nor RAID-6.
Previously, I would use RAID-0 on top of two RAID-1s:
----RAID0----
| |
RAID1 RAID1
| | | |
HDD1 HDD2 HDD3 HDD4
With RAID-0 on top of RAID-1, with 4 drives, I would achieve:
- 100% chance of recovery if any single, one disk fails,
- 50% chance of recovery if any two disks fail.
Now with RAID-10 in the Linux kernel, what are my chances of recovering
from a single and two disk failure?
RAID10
------------------
| | | |
HDD1 HDD2 HDD3 HDD4
Is it also 100% if one disk fails, and 50% if two disks fail?
Or perhaps, with 4 drives, RAID-10 can survive any 2 disks failure?
--
Tomasz Chmielewski
http://wpkg.org
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