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HP-UX System Administrator's Guide: Routine Management Tasks: HP-UX 11i Version 3 > Appendix A Using High Availability Strategies

Using High Available Storage Systems (HASS)


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High Available Storage Systems (HASS) provide two internal SCSI busses, each with their own connectors, power cords, power supplies, and fans. This hardware redundancy, when combined with software ing, can prevent most single point of failure problems. HASS do not provide any RAID support on their own.

Pros and Cons of HASS

There are many advantages of systems protected by HASS. These include disk storage modules that are hot-pluggable which means that the bus and connectors are made so that the disk module can be inserted or removed without removing the terminator for the array. All hardware modules are easily removed from the front of the chassis. HASS do not have the problems of previous disk configurations that required extra-long F/W SCSI cables, the removal of the chassis from the cabinet, and the removal of the cover before individual disk mechanisms can be replaced.

The negative side of HASS is that operating system cooperation is still required when removing a disk module from the HASS since the HASS does not provide any data protection or regeneration of data on a newly replaced disk module. HASS is primarily a hardware protection strategy and software mirroring is required to implement a mirroring scheme on HASS.

Recommended Uses of HASS

The HASS protection system is an excellent step in preventing single points of failure and is recommended for systems that must be available as much of the time as possible. Serviceguard can employ HASS for additional data storage. See“Using Serviceguard”.

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