5-2
Pronto3 Hardware Guide
5.1 Hard Disk Maintenance
This section deals with the possible event of a hard disk failure. First,
some introductory information about the RAID data protection are pro-
vided. After that follows a description how to act when a hard disk fails.
5.1.1 Introduction to RAID Data Protection
In a system where huge amounts of data are processed, large storage
capacities combined with high data throughputs are mandatory. To
provide both at the same time it is common practice in the area of video
and digital film to configure several hard disks together into a stripe set
or RAID. The IT world has defined several ’levels’ of RAID, most of
them providing some kind of data protection. Because of this DVS uses
RAID 5 to add protection to the stored data as any single disk can fail,
but the data will still be recoverable.
The RAID 5 feature makes the Pronto3 tolerant of disk failures. Even
with a broken disk an operation can still be continued and, once the
failed disk has been replaced, the missing data can be recovered easily.
The main storage of the Pronto3 comprises up to 16 hard disks and the
data is striped across these hard disks. Additionally, it provides up to
two RAID controllers that each connects a set of eight hard disks. The
RAID controllers are independent RAID 5 systems and make the data
protection available for the connected hard disks. The information nec-
essary to rebuild a failed hard disk (parity information) is generated and
written across the disks connected to a RAID controller. Thus, for each
controller present in the Pronto3 one hard disk can fail and the system
will still be functional and able to recover data.
You can identify the hard disks that are connected to a RAID controller
easily in the Pronto3 because every two rows represent one disk set:
Figure 5-1: Disk sets in the DVS system
If one hard disk within a disk set fails, the missing data can be recalcu-
lated due to the parity information stored on the other disks of the set.
disk
se
t 1
disk set 2
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