Dell External OEMR R520 Technical Manual page 22

External storage for the R520 is available through optional HBAs for SAS, iSCSI, and Fibre Channel.
For more information, see Dell.com/Storage.
Dell provides highly capable RAID options for you to ensure that your data remains safe. Dell's RAID
controller options offer impressive performance improvements, including the following features:

FastPath™ I/O: This feature can help accelerate performance when operating on SSDs.

Split mirror: This function allows you to break mirrored disk connection in order to quickly
replace a drive.

Physical disk power management (Dimmer Switch™): This feature allows for power control of
spare or idle drives, which can save energy and operating expenses.
The newest line of PERC (PowerEdge RAID Controller) cards offer high I/O performance for
database applications and streaming digital media environments. The internal RAID controllers have
a dedicated connection to the system board. The R520 supports the new PERC 8 family of
controllers with improved functionality and faster performance.
The default PERC for the R520 is a mini-type PERC. The R520 also supports the new software RAID
solution that supports RAID 0, 1, 5 and 10. The R520 supports the PERC cards listed in Table 12. For
more information about the latest PERC offerings, see Dell.com/PERC.
Controller Description
Eight-port,
PERC H810 external 6Gb/s
External PCIe RAID
controller
Eight-port,
PERC
internal 6Gb/s
H710P
PCIe RAID
Internal
controller
Eight-port,
PERC H710 internal 6Gb/s
Internal PCIe RAID
controller
Features
Includes 1GB NV DDR3
cache, premium
performance and feature set,
security SED/EKMS, and SSD
as cache
Includes 1GB NV DDR3
cache, premium
performance and feature set,
security SED/EKMS, and SSD
as cache
Includes 512MB NV DDR3
cache, advanced feature set,
security SED/EKMS
RAID
Form
modes
factor
supported
0, 1, 10, 5,
Adapter
50, 6, 60
0, 1, 10, 5, Integrated
50, 6, 60 mini-type
0, 1, 10, 5, Integrated
50, 6, 60 mini-type
Usage
model
Premium
performance
Premium
performance
Performance