System component description
17
EMC® VNX5300™ Hardware Information Guide
VNX5300 rear view
On the rear, viewing from bottom to top, a Block and File VNX5300 platform includes
the following hardware components:
◆
One to two SPSs
◆
One DPE with two storage processors (SPs), each SP (A and B) having one CPU
module and one power supply
◆
One to two Control Stations
◆
One Data Mover Enclosure with one to two Data Movers
Standby power supply
rear view
The Block and File VNX5300 platform includes one to two 1U, 1.2-kilowatt standby
power supplies (SPSs) to maintain power to the Block and File VNX5300 platform SP
during power loss. Within the SPS, a built-in DC battery pack is charged by way of an
AC-DC converter. AC input power from the power distribution unit (PDU) goes into
the SPS AC power inlet to the AC-DC converter. This converter then converts the AC
power to DC power, which is then stored into the built-in DC battery pack. When
emergency power is needed by the Block and File VNX5300 platform SP, a second
DC-AC converter inside the SPS takes the DC power from the DC battery pack and
then converts it to AC power. This AC power then goes from the SPS AC power
outlet to the VNX5300 platform SP (
).
Note:
Two SPSs provide higher availability and allow write caching, which prevents data loss
during a power failure, to continue.
IMPORTANT
!
A faulted or not fully charged SPS disables the write caching.
If AC power fails, the SPS provides backup power until the SP has flushed its write
cache data to the DAE disks. The SP then shuts off SPS power. If the cache flush has
not completed within 90 seconds—more than enough time to flush a full cache—or if
the SP has failed, then the SPS shuts down to prevent a deep discharge. If there is no
AC input power and the SPS is shut down, all the status lights will be off.
The output voltage, when the SPS is in the On-Line state, is a straight pass-through of
the AC-line from inlet to outlets. When in the On-Battery state, the output voltage
shall be at an AC level within the specified limits (see the SPS battery LED in
When power returns, the SPS starts recharging the DC battery pack. It may reach a
state of full charge relatively quickly. If power remains off for a long period—days or
weeks—the DC battery may require more time to charge fully.
7
The storage processor
will not use the write cache unless it detects at least one fully charged SPS.
Battery lifetime depends on the number of discharge cycles and the depth of
discharge. In a typical environment, a battery pack can last 3 to 5 years. The DC
battery pack lifetime is shorter in locations that have frequent AC outages.
Looking from left to right,
shows an example of the rear view of
two SPSs (B and A, respectively).
Two SPSs
An additional SPS can be added for redundancy. When only one SPS is used, the AC
power out connectors for the SPS supply AC power to both SP A and SP B.
7. After a full power outage, an SPS typically requires 45 minutes or a maximum of 75 minutes
to charge. To charge the SPS after being off-line usually requires at least 2 hours.
