Chapter 2 - Topologies and Operating Modes
How Available are Clusters?
39
How Available are Clusters?
This table outlines the maximum availability per downtime in the different
architectures:
Application of Availability
The imageRAID Series Storage Systems implementation of availability within its
supported topologies are as follows:
Architecture
Maximum Availability
Downtime per Failure
Downtime per Year
(in minutes)
Continuous Processing
100.00%
None
0
Fault-Tolerant
99.9999%
Cycles
0.5 - 5
Clusters
99.9 - 99.999%
Seconds to
minutes
5 - 500
High Availability
99.9%
Minutes
500 - 10,000 (disk
mirroring)
Stand Alone System
99.5%
Hours
2,600 - 10, 000
(without disk
mirroring)
Architecture
Corresponding Topology
Continuous Processing
Not Available
Fault-Tolerant
Duplex Multi-Port
Cluster
Duplex Multi-Port
High Availability
Duplex Multi-Port
Stand Alone System
Simplex Dual Port
imageRAID.book Page 39 Tuesday, September 23, 2003 4:08 PM
Summary of Contents for IRF-1D series
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