Hardware Reference
In-Depth Information
500
Compute power
Storage power
400
300
200
100
0
0
20
40
60
80
100
120
140
160
Time Since Initial Measurement (hours)
FIGURE 34.2: Power use for Palmetto and its storage infrastructure.
Meanwhile, total compute power draw ranged from 359 to 427 kW. During
higher utilization periods, it is likely that the compute power draw is higher,
thus reducing the proportion of power used by storage.
34.2.4 Dawn
Dawn is a 500-TFLOPS 147,456-core Blue Gene/P machine that was pro-
cured as a code-development and scaling platform for Sequoia [6]. It is con-
nected to a storage cluster called Dusk, which contains 8400 10000-RPM 400-
GB disks, connected to 56 DDN S2A 9900 controllers. The disks are organized
into 8+2 RAID 6 arrays, with 15 arrays per Lustre object storage server. In-
ternally to Dusk, there is an Infiniband network for data movement, along
with an Ethernet management network. Dusk is connected to Dawn via 10
GigE.
Power data was automatically collected from Dawn and Dusk through July
2011, at 15-minute and 30-minute intervals, respectively. Figure 34.3 shows
the power use of Dawn and Dusk during July 2011. There was a gap in Dusk's
data collection of about 24 hours, which is visible in Figure 34.3.
34.2.5 Overall Survey Results
Figure 34.4 shows the proportion of system power used by disks in several
machines. For the majority of scenarios presented, disk infrastructure uses
