The HP 694033-B21 is a 512MB Flash Back Write Cache module designed for ProLiant BL660c Gen9 blade servers. This battery-backed cache module installs in the server's mezzanine slot and significantly improves write performance for storage-intensive workloads by enabling write caching on supported controllers. The kit is compatible with HP Smart Array controllers in BL660c Gen9 systems and is ideal for virtualization, databases, and I/O-heavy enterprise applications where write latency reduction is critical. The 512MB capacity provides sufficient buffering for typical transactional and sequential write operations. Part number 694033-B21 is OEM-equivalent and fits within the standard ProLiant blade server form factor.
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