If one controller fails, the other one will immediately take over to provide high availability with the least downtime.

Specification

Product
Product id	593356
Brand	QNAP
Partnr	CTL-ES1640DC-V2-48G
EAN/UPC code	4713213510759
Warranty (months)	36 months
Technical details
Mac compatibility	N
Supported hard disk drive interfaces	SAS