4
Chapter 1 Introduction
High Availability (HA) Note: A system using a single controller (DSN-5110-10,
DSN-5210-10 or DSN-5410-10) and its expansion array(s) may use SAS or SATA
drives. A system using dual controllers for High Availability operation (DSN-
510 for the 5110-10, DSN-520 for the 5210-10 or DSN-540 for the 5410-10)
requires SAS drives be used in both the primary array and any expansion
array(s).
If you anticipate upgrading to HA with the addition of a second controller,
then it is recommended you install SAS drives.
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