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AG-7.2.B1-092414 • Restricted - customer use only
RAID 6
RAID-6 can tolerate the concurrent failure of two hard drives while precluding data loss and system
downtime. RAID 6 provides a second layer of redundancy by means of two separate, independent
parity blocks within each stripe written to the data storage subsystem array, distributed among each
of the active members in the array. Thus, another moniker for RAID-6 is "double-parity RAID".
RAID 6 requires a minimum of four drives, but will typically have a significantly larger number of
array members since performance, fault tolerance, and cost efficiency are improved with a larger
population.
7.2
RAID Controllers
MIP uses
Broadcom
9271-4i or 9271-8i RAID controllers. The 4i has 4 6 Gb/s SATA or SAS ports, the 8i
has 8 6 Gb/s SATA or SAS drives. Except for the number of ports the controllers are identical. The 4i
is used with the 4, 16, 24 HDD chassis. The 8i is used with the 8 HDD chassis.
Figure: 9271-8i Controller
7.3
Accessing the RAID Controller
As part of the initial build, Volicon, a division of Verizon Digital Media Services installs the appropriate
RAID controller. To access the controller, click the
MegaRAID icon located on the server desktop.
Figure: RAID Controller Desktop Icon
The controllers will be automatically discovered in most cases; the controller on the local server will
be found, but in some cases may include other networked server’s RAID controller.
Note the Health column in the figure below. It indicates if the array is working correctly without the
need to log in.
