Dovecot + SAN with dedup+compression

Hello

 We have a big Dovecot Server (over 20 TB of mail, 40K users, over 

30K iops) and we are evaluating a new SAN Array. We have competitive proposals from Pure Storage (All Flash) , HP 3Par (Hybrid), NetApp FaaS (Hybrid) & EMC Unity (Hybrid). We rely in mdbox+zlib for main storage and mdbox+lzma for secondary storage, does anybody in the list have experience with SAN-based deduplication/compression? Regards Maria.