Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 8)

additional hard drives to the enclosure as needed.
The DAE2 is also available as the DAE2-OS—a DAE2 enclosure with the core software (FLARE) preinstalled on the first five
hard drives that provides both the primary storage and the operating system for the CX600 storage system.
Additional features include:
2-Gb/s Fibre Channel data transfer rate
Maximum capacity of fifteen 1-inch 146-GB hard drives
Redundant hot-swappable power supplies, cooling fan assemblies, and link control cards (LCCs)
Table 1-3 lists the number of supported DAE2 enclosures for each storage system.
Table 1-3. Supported DAE2 Enclosures
Storage System Supported DAE2 Enclosures
CX200 One
CX400 Up to 3
CX600 Up to 16
.
SPS
The SPS is a 1-U power supply that provides backup power to the processor enclosures or the CX600 SPE and its first DAE2
(or DAE2-OS) enclosure. The storage system requires two SPSs, with each SPS connected to a separate power source for
redundancy. If both power sources fail, the SPSs enable the SPE to flush the write cache to the vault drives. When the power
is restored, the SPE writes the cache content in the vault drives back to the cache. This method ensures that the SPE cached
data is not lost during a power failure.
Each SPS is hot-swappable, and two 1000-W DC SPSs are required for the following:
CX200 — DPE
CX400 — DPE
CX600 — SPE and its first DAE2-OS enclosure
The SPS installs in the SPS rack kit below the SPE.
NOTICE: To avoid data loss, do not disconnect any power or SPS cables or turn off the CX200 DPE, CX400 DPE, CX600
SPE, or DAE2 power supplies during normal operation. If you need to shut down the SPE, DPE, or DAE2 enclosure(s),
stop all I/O to the storage system, stop the Cluster Service, and then shut down all the host systems attached to the
storage systems. After you perform these procedures, turn off the SPS devices by using their power switches.
HBA
The HBA is an I/O adapter that connects the server's PCI bus to the storage components. Two HBAs must be installed in each
server in the SAN to manage the I/O data transfer from the server to the storage system. See the Platform Guide for a list of
supported HBAs.
Fibre Channel Switch