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@xxxxxxxxx/
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