Versatile, scalable storage expansion with dual Environmental Service Module (ESM) configurations for high availability and performance Flexible host connectivity to match diverse client needs for direct attach storage with support for 6 Gb or 12 Gb SAS RAID adapters for advanced data protection or 6 Gb or 12 Gb SAS Host Bus Adapters (HBAs) for maximum JBOD performance 12 Gb SAS drive-side connectivity and storage density with support for 84x 3.5-inch large form factor (LFF) drives in a 5U rack space Scalability of up to 336 drives per HBA with the attachment of up to four D3284 daisy-chained expansion enclosures to satisfy growing needs for storage capacity and performance Flexibility in daisy chaining of up to two D3284 and two D1212 or one D1224 drive enclosures Flexibility in storing data on high performance SAS SSDs or capacity-optimized enterprise NL SAS HDDs; mixing and matching drive types on a single HBA to perfectly meet performance and capacity requirements for various workl