zfs discuss - Nov 2006 - ZFS Mirror Configuration??

Hi All,
        How would I do the following in ZFS. I have four arrays connected to an
E6900.
Each array is connect to a seperate IB board on the back of the server. Each
array
is presenting 4 disks.

c2t40d0 c3t40d0 c4t40d0 c5t40d0
c2t40d1 c3t40d1 c4t40d1 c5t40d1
c2t40d2 c3t40d2 c4t40d2 c5t40d2
c2t40d3 c3t40d3 c4t40d3 c5t40d3

Controllers c2/c3 are in one power grid and c4/c5 are in another power grid

I want to create a RAID 1+0 mirorr configuration

{c2t40d0 c2t40d1 c2t40d2 c2t40d3 c3t40d0 c3t40d1 c3t40d2 c3t40d3} stripe
                                                  |||
                                                MIRROR
                                                  |||
{c4t40d0 c4t40d1 c4t40d2 c4t40d3 c5t40d0 c5t40d1 c5t40d2 c5t40d3} stripe

It has to be mirored like this as I need this to survive a power outage

Regards & Thanks

OAB
 
 
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On 14 November, 2006 - oab sent me these 1,0K bytes:
> Hi All,
>         How would I do the following in ZFS. I have four arrays connected
to an E6900.
> Each array is connect to a seperate IB board on the back of the server.
Each array
> is presenting 4 disks.
> 
> c2t40d0 c3t40d0 c4t40d0 c5t40d0
> c2t40d1 c3t40d1 c4t40d1 c5t40d1
> c2t40d2 c3t40d2 c4t40d2 c5t40d2
> c2t40d3 c3t40d3 c4t40d3 c5t40d3
> 
> Controllers c2/c3 are in one power grid and c4/c5 are in another power grid
> 
> I want to create a RAID 1+0 mirorr configuration
> 
> {c2t40d0 c2t40d1 c2t40d2 c2t40d3 c3t40d0 c3t40d1 c3t40d2 c3t40d3} stripe
>                                                   |||
>                                                 MIRROR
>                                                   |||
> {c4t40d0 c4t40d1 c4t40d2 c4t40d3 c5t40d0 c5t40d1 c5t40d2 c5t40d3} stripe
> 
> It has to be mirored like this as I need this to survive a power outage
If I interpret your ascii gfx right, you want two big stripes and then
mirror them.. problem is if one disk from each mirror dies -> you lose..
Another way is to create 8 mirrors and stripe them..

zpool create blah \
	mirror c2t40d0 c4t40d0 \
	mirror c2t40d1 c4t40d1 \
	mirror c2t40d2 c4t40d2 \
	mirror c2t40d3 c2t40d3 \
	mirror c3t40d0 c5t40d0 \
	mirror c3t40d1 c5t40d1 \
	mirror c3t40d2 c5t40d2

/Tomas
-- 
Tomas ?gren, stric at acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Ume?
`- Sysadmin at {cs,acc}.umu.se

Hi Tomas,
              Thanks for that. Got to get my out of Veritas way of looking at
mirrors.
Another reason for wanting it this way is that IF the functionality of splitting
mirrors
comes into ZFS whereby we can import them into a new pool or even a new LDOM,
then we know exactly the boundary to split them on.

Anyways thanks for that.

Regards

OAB
 
 
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