Synology High Availability White Paper - Based on DSM 6.2
Synology DS418play Enclosure User Guide | Manualzz
Adding an SSD cache to Synology DS-1813+ – Notes from MWhite
Synology DiskStation User's Guide
Synology - Synology SSD Cache technology provides a solution to enterprise challenges which boosts read and write speeds without adding to the overall number of disks. More details in this white paper:
Synology DiskStation DS720+ 2-Bay NAS Enclosure, Black - Walmart.com