Figure 16 Cache memory
Table 15 Cache memory
DescriptionItemDescriptionItem
Cache Memory Adapter:2Micro Processor Blade1
8, 16, or 24 GB standardIncludes 4 GB cache
32 GB SSD drives optional
1 or 2 16 GB SSD drives
Micro Processor Blade cluster 14Micro Processor Blade cluster 03
Cache cluster 16Cache cluster 05
Cache cluster 38Cache cluster 27
Memory operation
The HP XP7 places all read and write data in the cache. The amount of fast-write data in cache is
dynamically managed by the cache control algorithms to provide the optimum amount of read
and write cache, depending on the workload read and write I/O characteristics.
Mainframe hosts can specify special attributes (for example, cache fast write command) to write
data (typically sort work data) without write duplexing. This data is not duplexed and is usually
given a discard command at the end of the sort, so that the data will not be destaged to the drives.
Data protection
The HP XP7 is designed so that it cannot lose data or configuration information from the cache if
the power fails. The cache is protected from data loss up for up to ten minutes by the cache destage
batteries while the data is copied to the cache SSD (flash memory) on the cache boards (see
“Battery backup operations” (page 67)).
60 System components
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