EverFocus NVR - Page 153

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improved by spreading the I/O
load across many channels and
drives
 No parity calculation overhead is
involved
being lost
 Should not be used in mission
critical environments
 RAID 1
Advantage
Disadvantage
 Simplest RAID storage subsystem
design
 Can increase read performance by
processing data requests in
parallel since the same data
resides on two different drives
 Very high disk overhead - uses
only 50% of total capacity
 RAID 5
Advantage
Disadvantage
 High Read data transaction rate
 Medium Write data transaction
rate
 Good aggregate transfer rate
 Most versatile RAID level
 Disk failure has a medium impact
on throughput
 RAID 10
Advantage
Disadvantage
 Implemented as a mirrored RAID
 Volume whose segments are RAID
0 RAID Volumes
 High I/O rates are achieved
thanks to multiple stripe
segments
 Very high disk overhead – uses
only 50% of total capacity