Chapter 1 DPM5500 System Description
Turning on the System
Quantum DPM5500 User’s Guide
8
frees up the concentration on a single drive, improving overall subsystem
throughput.
The RAID 5 parity encoding scheme maintains the system’s ability to
recover any lost data should a single drive fail. This can happen as long as
no parity stripe on an individual drive stores the information of a data
stripe on the same drive. In other words, the parity information for any
data stripe must always be located on a drive other than the one on which
the data resides (see
figure 8
).
Figure 3 RAID 5 Configuration
Drive 0
Drive 1
Drive 2
Drive 3
Drive 4
A0
A1
A2
A3
1 parity
B0
B1
B2
2 parity
B4
C0
C1
3 parity
C3
C4
D0
4 parity
D2
D3
D4
0 parity
E1
E2
E3
E4
Data stripe
Data stripe A
Data stripe B
Data stripe C
Data stripe D
Data stripe E
Turning on the System
1
To turn on the DPM5500 system (see
figure 4
):
1
Push the power button located on the front of the DPM5500.
