Compaq StorageWorks HSZ80 Configuration And Cli Reference Manual page 86

2–32 Configuring an HSZ80 Array Controller
Fault-Tolerance
The cache module supports the following features to protect the availability of its
unwritten (write-back) data:
Nonvolatile memory (required for write-back caching)
Dynamic caching techniques (automatic)
For details about these features, see "Fault-Tolerance for Write-Back Caching,"
page 1–22.