Hello Alan_Ting, You can’t combine storage pools that are owned by different controllers.  since you are needing 1PB you will have to do it via CLI.  Here is the link to the support matrix & if you look on page 7 it states the following “ Maximum usable virtual pool size per controller module = 512 TiB with the large pools feature disabled in the CLI and 1 PB with the large pools feature enabled in the CLI” [URL] Here is also a link to the CLI guide. [URL] Please let us know if you have any other questions.
Hi  Does ME4 RAID 6 or ADAPT for Storage A virtual 1 for (500TB) and Storage B virtual 1for (500TB) able to combination to single logical large volume 1PB [IMAGE]  
ME4 create single Logical volume TB