Technical information

About This DIGITAL HiTest Suite
2–2
HiTest Notes for Lotus Domino Windows NT Prioris MX
Availability
Availability, which describes a computer system’s ability to quickly recover from a failure,
can be described in terms of the following:
• Data Protection – Ensures long-term data accessibility by providing the facility to do
offline data backup.
• Data Availability – Stores redundant data on line for rapid, automatic data recovery in
the event of a failure. Data availability is typically provided through the use of RAID
technology.
• Platform Availability – Enables processing to continue during failure by using
technologies that support failover to other components. Clustering, redundant power
supplies, battery backup, and other components provide support for platform availability.
• Disaster Tolerance – Protects against computer room disasters such as fire, flood, and
sabotage. Disaster Tolerant Systems require an additional system at a remote site and are
more expensive than the previously defined alternatives. (The DIGITAL HiTest process
does not test disaster tolerant configurations. If disaster tolerance is a requirement, your
sales person can provide more information.)
Features of Lotus Domino Windows NT Prioris MX HiTest Suite
The DIGITAL HiTest process verified that each of the availability features provided by this
Suite operate correctly and provide the protection required for all configurations.
Table 2-1 indicates availability features that are always included in this HiTest Suite when
configured with the AppSet and those that are customer options.
Table 2-1: Lotus Domino Windows NT Prioris MX Availability Features
Availability Feature Enabling Technology Always
Included
Customer
Optional
Data Protection Backup and restore Yes
Data Availability Redundant disk storage (RAID) Yes
Recommendations for Lotus Domino Windows NT Prioris MX HiTest Suite
This HiTest Suite provides high availability while maintaining high performance and low
cost. Hardware with a high mean-time-between-failures (MTBF) is used. An option for
redundant data storage assures data availability. To reduce the risk of system failures,
DIGITAL recommends that the following levels of availability features be considered for this
HiTest Suite:
• Data Protection
− Long term data accessibility is always provided with this HiTest Suite by a 4/8 GB
DAT tape drive, which provides up to 8 GBs of compressed data storage.
• Data Availability
− When high data availability is not a concern, disks may be configured as just a bunch
of disks (JBOD) or RAID 0, providing storage capacity between approximately 2 GB
and 12.9 GB.
− When two drives are used for data and high availability is required, DIGITAL
recommends the use of RAID 1.