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need help understanding RAID (possibly RAID 5?)

Tags:
  • Hard Drives
  • Storage
  • NAS / RAID
  • Performance
  • Configuration
  • Backup
Last response: in Storage
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October 10, 2014 9:18:40 PM

Hopefully someone can tell me if my idea is in fact a RAID setup and if so which level and also if there may be a better option.

I have 3 HDD's
1x500gb and 2x250gb

im wondering if i can set them up so that the 2-250gb HDD's can be in a RAID 0 configuration(striped) and then configured into a RAID 1(mirrored) configuration with the 500gb

hopefully that makes sense. To better get my point across i guess an easier way to put it would be to say that im wanting to split files across the two 250gb drives for performance and and to make up a total of 500gb of space and then to have that space mirrored to the 500gb HDD as a kind of backup solution.

now ive read quite a bit about RAID and the only thing i think that comes close to this idea is raid five but im confused about parity

any help would be greatly appreciated

Cheers

Rory

More about : understanding raid possibly raid

October 10, 2014 9:46:44 PM

1) Raid 0:
Imagine 2 HDDs. Here are the data (they are called A, and there are 8 blocks).
/dev/sda /dev/sdb
A1 A2
A3 A4
A5 A6
A7 A8
This is called stripped. It just spreads data around for performance.
2) Raid 1
Reimagine the two hard drives. Now, here are the data:
/dev/md0 (HDD 1)(Linux's way to call RAID HDDs)
A1-A4
/dev/md0 (HDD 2)
A1-A4

The RAID is duplicated to the second HDD, and uses that entire image to restore it into the original HDD. It's redundancy.

Above RAID 1 gets super crazy. But here's to help:
http://en.wikipedia.org/wiki/Standard_RAID_levels

And I suggest the RAID 10 (RAID 1+0), because it improves speed while being redundant. So get 2 more 250 GB.
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less than a minute ago

@okcnaline

yes I understand raid 0 and raid 1 not problem. But, im curious if the way I want to set the disks I have up will actually work. If so is there a raid level it refers to? I don't really want to get another 2x250gb HDDs and was hoping someone would let me know if the way I described would work. I guess I coukd partion the 500gb into to even partions and make it seem like 2 disks but im not sure that will work either. I dunno anyways thanks for your reply nonetheless and have a good one eh. cheers.
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