Hi,

What is the minimum number of disks required for raid10 dm on these units? 

also does this differ from raid 10 with distributed sparring ?

I would like 6 x 800GB SSD WI in tier1 but with dual redundancy akin to raid 6. it would look like i need 7 disks for distributed sparring (traditional hot spare)

but the dual mirror requirements are not clear to me.

with 6 disks i thought you could have a 3 write penalty with 33% usable space 3 disks per pair instead of 2

 

overall configuration is as follows 

scv3020

6 x 800gb SSD WI - tier 1 raid10dm

10 x 1.92TB SSD RI - tier 2 - raid 6

10 x 2.4TB HDD 10K - tier 3 - raid 6

 

I would like dual redundant array configuration. also can someone critique this build? i have run live optics and believe sized accordingly. 

thanks