Raid 1+ 0 with only 3 disks ?

[Jesus]

Hello (sorry for my english)
Does someone know if it's possible to create a raid 1+ 0 with only 3
disk like this :

|
_______Raid 1_______
Capacities :
|
| Disk 1 = Disk 2 = nGo
____Raid 0____ Disk
3 Disk 3 = nGo x 2
| |
Disk 1 Disk 2


I think it's possible with a Hardware Raid 0 and a Software Raid 1,
but is it possible with both hardware raid ?
If yes how can I improve Raid 1 speed traitement.

Thanks :)

[Jesus]

sorry for the previous shema
you can see it here ;) :
http://img253.imageshack.us/img253/9467/raid013fv2.png

[Jesus]

As you can see I was talking about 0+1 Raid and not 1+0 (sorry, hard
day)

[deepaksamraj]

Hi,
As far as i know i think Hardware Raid 1+0 will require a minimum of
4or >4 i.e even number of disks.

Correct me if i am wrong..

regards,
Deepak

[Błażej Antczak]

On Sat, Jun 21, 2008 at 6:37 PM, deepaksamraj <deep...@gmail.com> wrote:

Hi,
As far as i know i think Hardware Raid 1+0 will require a minimum of
4or >4 i.e even number of disks.

Correct me if i am wrong..

 

You're wrong - this is required for RAID 5 - and minumum is 3 disks (1 for parity info) 

[deepaksamraj]

No, Raid 1+0 is mirroring combined with striping, so you will need
first a pair of disks to mirror the data and another pair of disks to
stripe the data.



On Jun 21, 10:39 pm, "Błażej Antczak" <bl.antc...@gmail.com> wrote:

> On Sat, Jun 21, 2008 at 6:37 PM, deepaksamraj <deepak...@gmail.com> wrote:
>
> > Hi,
> > As far as i know i think Hardware Raid 1+0 will require a minimum of
> > 4or >4 i.e even number of disks.
>
> > Correct me if i am wrong..
>
> You're wrong - this is required for RAID 5 - and minumum is 3 disks (1 for
> parity info)
>
>
>
> > regards,
> > Deepak
>
> > On Jun 20, 10:16 pm, Jesus <Delcourt.Mor...@gmail.com> wrote:
> > > As you can see I was talking about 0+1 Raid and not 1+0 (sorry, hard
> > > day)
>

> --
> Regards., Blazej Antczak
> -= Did U even tried to figure out woman with man? #man woman --> core
> dumped, sys error =-

[Błażej Antczak]

You're right - RAID-10 is a minumum of 4 drives.

2008/6/22 deepaksamraj <deep...@gmail.com>:

[Jesus]

Thank for your answers but i made a mistake in the title and correct
it on june 20 (and as i see you really don't see this)

So i know for 1+ 0 raid you must use > 4disks,
but the question was about 0 + 1 raid :)
regards

[Błażej Antczak]

for RAID 01 you'll need 4 disks as well.

[deepaksamraj]

As far as i heard raid 0+1 is less used and is a poorer solution
compared to raid 1+0. So you can go for 1+0 rather than implementing
0+1