Table of Contents
Advertisement
11.
STORAGE OPTIONS
The APRESA software can handle various hard drive configurations including RAID.
Because the MTBF figure of a modern, server class, hard drive is well over 1million hour, very reliable
system can be built at relative low cost without RAID. In a demanding environment, the use of a RAID
configuration may be considered to achieve higher system availability.
The hardware RAID is more expensive but considered to be superior compared to software RAID in
terms of system availability, speed and service.
Using RAID improves the system reliability. We advise to use '24x7-grade' hard drives and to build
RAID volume with identical hard drives.
11.1. Configuration
No raid
This is the very basic configuration and it works with only ONE hard drive and when it fails it will cause
the system to crash.
Software RAID1
A RAID 1 array deploys always TWO hard drives. This mechanism is also known as the 'Mirroring RAID'
because the hard drives are continuously kept to their mutual image. One failing hard drive will have no
effect on the system functionality. The capacity of a RAID1 volume equals the capacity of the smallest
volume member.
Software RAID5
A RAID 5 array deploys always THREE or more hard drives. One failing hard drive will have no effect on
the system functionality. The capacity of a RAID5 volume equals the capacity of N-1 GBYTE, were
N=the number of hard drives in the RAID5 volume.
Hardware RAID1
Is in terms of functionality this one behaves just like the 'Software RAID1', but a
dedicated RAID interface controller card manages the virtual drive.
Hardware RAID5
Is in terms of functionality this one behaves just like the 'Software RAID5', but a
dedicated RAID interface controller card manages the virtual drive.
INSTALLATION MANUAL APRESA
No Raid (also referred as 'Standard')
•
Software RAID1
•
• Software RAID5
Hardware RAID1
•
Hardware RAID5
•
COPYRIGHT © 2011-2017 VIDICODE ®
79
Advertisement
Table of Contents
