Chapter 1 DX-Series System Description
Supported RAID Configurations
Quantum DX-Series User’s Guide
14
which in turn enhances overall system performance. Instead of allowing
any one drive in the array to assume the risk of a bottleneck, all of the
drives in the array assume write activity responsibilities. The distribution
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
).
Note:
The DX-Series storage array is shipped with the following
RAID configuration:
•1 logical drive configured in RAID 5 (7 data 1 parity
drive)
•1 logical drive configured in RAID 5 (6 data 1 parity
drive)
•1 global hot spare drive
To reconfigure the DX-Series storage array to either remove
the hot spare or add an additional hot spare (total of two hot
spares), contact Quantum customer support (see
Customer
Support
on page xvii). Reconfiguring the storage array RAID
configuration will cause all previously stored data to be lost.
