what is the max storage?

Hi there! This unit has 12 bays, so you could use 12 x 14 tb hard drives on this. Here is a pretty great tool that is provided by Synology that lets you figure out the best configuration and raid options for you. https://www.synology.com/en-us/support/RAID_calculator?hdds=

Does this come with a rail kit?

No, the rail kit is a separate item listed as Synology Rail Kit RKS1317. Enjoy your future Synology NAS.

Does it comes with the 12 drive trays?

Yes the unit comes with the drive cage/tray empty.

Questions & Answers: Synology RS2418+ 12bay NAS RackStation (Diskless)

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Synology RS2418+ 12bay NAS RackStation (Diskless)

Outstanding performance at over 1,400 MB/s sequential read throughput and 27,000 4K random write IOPS, capable of installing optional 10GbE NICs
Scale up to 24 drives with Synology RX1217/RX1217RP
Comprehensive file services including SMB, NFS, FTP and WebDAV with Windows ACL & Domain/LDAP support
Dynamic iSCSI/NFS storage for VMware, Windows Hyper-V, Citrix, and OpenStack
Advanced BTRFS file system offering 65,000 system-wide snapshots and 1,024 snapshots per shared folder

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