[geeks] RAID quirks and terminology

[Lionel Peterson]

I'm confused.

A2 was a mirror of A1, or part of a stripe pair with A1? How does striping
figure into this?

If you wrote a file onto this array, how many copies would there be?

Assuming each drive has the same capacity ('n'), what was the total storage
available to the user? I'm guessing 3n/2? RAID5 would give you 2n wouldn't
it?

Why did you think this was better than RAID5? Lower computational overhead?

Why wouldn't this be RAID5? This is how I describe RAID5 to folks...

Lionel

> On Jun 15, 2014, at 10:54 AM, Phil Stracchino <phils at caerllewys.net> wrote:
>
> I did a rather unconventional mirror-and-stripe once that wasn't
> strictly RAID10, to get a 2-way mirror out of three disks.  Let's call
> the drives A, B, C.  All were the same size.  I split each drive into
> two partitions, then mirrored the partitions like so:
>
> [ A1 | A2 | C1 ]
> [ C2 | B1 | B2 ]
>
> then striped the three mirrors.  I had full redundancy in each mirror,
> and no single drive failure could cause any mirror to fail.
>
> I don't know what the hell you'd properly call it.  :)