Re: Looking for the best way to do this

[maurice <mhilarius@gmail.com>]

On 6/23/2011 1:23 PM, Iordan Iordanov wrote:
> Hi Maurice,
>
> On 06/21/11 14:13, maurice wrote:
>> Add 3rd disk to make a 3 disk RAID1
>> Make a RAID10, missing one disk.
>
> Perhaps I misunderstand your supposition, and if I do, please correct 
> me. RAID10 with mdadm does not require a minimum of 4 disks.
Yes, that was my understanding.

> For example, mdadm can do RAID10 with 2 copies on 3 disks or RAID10 
> with 3 copies on 3 disks, yielding the equivalent of RAID1 in terms of 
> data security. It is not confined to mirroring two pairs of disks and 
> then striping across them as is the "conventional" way of doing RAID10.
Yes, I understand the principle.
>
> You can read the man-page of mdadm, where the options for "layout" of 
> RAID10 are discussed. Pay particular attention to the end of the 
> "--layout" option explanation.

What I do NOT know is the following:
A) Which is more RELIABLE: R1 with 3 disks or R10 with 3 disks.
B) HOW to create either the 3 disk R1 or R10, assuming an existing 2 
disk R1.



-- 
Cheers,
Maurice Hilarius
eMail: /mhilarius@gmail.com/