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Increased fault tolerance for applications requiring higher levels of availability
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Businesses are becoming more dependent on industry-standard servers to run memory-intensive and mission-critical applications. This trend is driving operating systems to support more memory and pushing the memory capacity of servers to new levels. System memory has become more reliable over the years because of better manufacturing processes and memory protection technologies like ECC, first introduced in industry-standard servers by hp. However, as the density of memory components and server memory capacity increase to meet the demand, there is a higher probability of memory errors occurring. Memory errors can corrupt data and cause servers to crash, resulting in the permanent loss of business data and lost revenue from downtime.
To meet this new memory reliability challenge, hp is developing three levels of AMP that provide increased fault tolerance for applications requiring higher levels of availability: hp customers will be able to choose a system with the level of memory protection they prefer-Online Spare Memory, Hot Plug Mirrored Memory, and hp Hot Plug RAID Memory. RAID, in this case, stands for Redundant Array of Industry-standard DIMMs.
Online Spare Memory mode provides a higher level of memory protection than Standard Memory mode. Online Spare Memory is beneficial to businesses with sites that do not have sufficient IT staff available to service a failure, do not always have replacement memory on hand, or where the server cannot be brought down before a scheduled shutdown.
Online Spare Memory mode protects against single-bit errors, but Mirrored Memory mode provides full protection against single-bit and multi-bit errors. For this reason, Mirrored Memory mode is beneficial to businesses that cannot afford downtime and cannot risk waiting until scheduled downtime to replace degraded memory modules.
- Single Memory Board Configuration (Non-Hot Plug)
Customers can enable Mirrored Memory mode using the primary memory board that comes standard with the server. This capability provides customers with full protection against single-bit and multi-bit errors using a single memory board. Customers can designate up to two banks as mirrored memory.
- Dual Memory Board Configuration
Hot Plug Mirrored Memory mode will use the optional memory board to provide complete redundancy and a higher level of memory protection than Online Spare mode. Hot Plug Mirrored Memory will also provide hot-add and hot-replace capability to increase server availability. This capability will be especially useful for businesses that cannot afford downtime and cannot risk waiting until scheduled downtime to replace degraded memory modules.
HP Hot Plug RAID Memory will deliver unprecedented levels of availability, scalability, and fault tolerance for 24×7 applications. It allows the memory subsystem to operate continuously, even in the event of a complete memory device failure. RAID, in this case, stands for Redundant Array of Industry-standard DIMMs.
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