This issue with not having RAID on the front end solaris box is what 
happens when 1 of the backend thumpers dies.  I would imagine that the 
entire zpool would become useless if 1 of the thumpers should die since 
the data would be across all the thumpers.

Tim wrote:
> What you want to do should actually be pretty easy.  On the thumper's, 
> just do your normal raid-z/raid-z2, and export them to the solaris box.  
> Then on the solaris box, you just create a zpool, and add the LUN's one 
> at a time.  No raid at all.  The system should just stripe across all of 
> the LUN's automagically, and since you're already doing your raid on the 
> thumper's, they're *protected*.  You can keep growing the zpool 
> indefinitely, I'm not aware of any maximum disk limitation.
> 
> 
> On Tue, Mar 25, 2008 at 6:12 PM, Larry Lui <[EMAIL PROTECTED] 
> <mailto:[EMAIL PROTECTED]>> wrote:
> 
>     Hello,
>     I have a situation here at the office I would like some advice on.
> 
>     I have 6 Sun Fire x4550(Thumper) that I want to aggregate the storage
>     and create a unified namespace for my client machines.  My plan was to
>     export the zpools from each thumper as an iscsi target to a Solaris
>     machine and create a RAIDZ zpool from the iscsi targets.  I think this
>     is what they call RAID plaiding(RAID on RAID).  This Solaris frontend
>     machine would then share out this zpool via NFS or CIFS.
> 
>     My question is what is the best solution for this?  The question i'm
>     facing is how to add additional thumpers since you cannot expand a RAIDZ
>     array.
> 
>     Thanks for taking the time to read this.
> 
>     Larry
>     _______________________________________________
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>     http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
> 
> 

-- 
Larry Lui
BIRN Coordinating Center
UC San Diego
9500 Gilman Drive
La Jolla, CA 92093

email: llui at ncmir dot ucsd dot edu
phone: 858-822-0702
fax: 858-822-0828
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