22 PowerEdge R520 Technical Guide
External storage
External storage for the R520 is available through optional HBAs for SAS, iSCSI and Fibre Channel.
For more information, see Dell.com/Storage.
Storage controllers
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:
ï‚· FastPathâ„¢ I/O: This feature can help accelerate performance when operating on SSDs.
ï‚· Split mirror: This function allows you to break mirrored disk connection in order to quickly
replace a drive.
ï‚· Physical disk power management (Dimmer Switchâ„¢): This feature allows for power control of
spare or idle drives, which can save energy and operating expenses.
Supported RAID controllers
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.
Table 12. Supported RAID controllers
Eight-port,
external 6Gb/s
PCIe RAID
controller
Includes 1GB NV DDR3
cache, premium
performance and feature set,
security SED/EKMS and SSD
as cache
Eight-port,
internal 6Gb/s
PCIe RAID
controller
Includes 1GB NV DDR3
cache, premium
performance and feature set,
security SED/EKMS and SSD
as cache
Eight-port,
internal 6Gb/s
PCIe RAID
controller
Includes 512MB NV DDR3
cache, advanced feature set,
security SED/EKMS
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