RAID: Tool for Reliability
The Tool for Reliability
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Input Value(s):
Mean-time-to-failure of disk1
MTTF(disk) =
hours
Mean-time-to-failure of disk2
MTTF(disk2) =
hours
Mean-time-to-failure of disk3
MTTF(disk3) =
hours
Mean-time-to-failure of the system
MTTF(sys) =
hours
Mean-time-to-repair of a single disk
MTTR =
hours
Mean-time-to-repair of the system
MTTR(sys) =
hours
Number of disks in the disk array
N =
p(disk)
p =
Parity group size
G =
RAID Level
RAID Level
RAIDlevel5
P+Q
Failure Characteristics
Failure Type
Double/Triple Disk Failure
Sys Crash + Disk Failure
Disk Failure/Double Disk Failure + Bit Error
Result(s):
Reliability of the disk array
R =
hours
or
years
MTTDL
MTTDL =
hours
or
years
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