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20 Operating Manual TX200 S6
Preface
High level of availability and data security
When memory data is accessed, 1-bit errors are identified in the main memory
and automatically corrected with the error correcting code (ECC) method. The
patented memory scrubbing function regularly starts up the EDC mechanism,
ensuring continuous data integrity.
The RDIMM memory modules used support SDDC technology (Chipkill™),
which further increases the effectiveness of memory error monitoring and
correction.
Memory modules can be protected against failure by mirroring (Memory
Mirroring). Memory Mirroring is roughly comparable to RAID level 1 for hard disk
arrays. The basic configuration requires two identical memory modules in two
different banks.
Support is likewise provided for hot-spare memory technology, in which a
memory bank is used like a replacement bank. If a memory module fails, the
bank with the defective memory is automatically deactivated and the
replacement bank is activated (provided it has been configured for appropriately
in the BIOS). The deactivated memory bank is no longer used and the faulty
memory module can be replaced during the next system maintenance. In order
to be able to use the hot-spare memory function, all occupied memory banks
have to be equipped with identical memory modules.
ASR&R (Automatic Server Reconfiguration and Restart) restarts the system in
the event of an error and automatically "hides" the defective system
components.
The PDA (Prefailure Detection and Analysis) technology from Fujitsu
Technology Solutions analyzes and monitors all components that are critical for
system reliability.
Optional RAID controllers support RAID levels like 0, 1, 5, ... and increase
system availability.
The hot-plug HDD modules provide additional availability.