380674-B21 is an HP/Compaq 256MB cache memory upgrade kit for HSG80/HSx80 Fibre Channel array controllers, consisting of two 128MB cache modules. HP documentation identifies it as the HSx80 256MB cache upgrade (2 × 128MB) and specifies that it can expand supported HSG80 controller cache; the HSG80 controller can support up to 512MB total cache with the appropriate configuration.
- Part Number: 380674-B21
- Manufacturer: HP / Compaq
- Product: StorageWorks HSG80 256MB Cache Memory Upgrade
- Cache Capacity: 256MB total
- Module Configuration: 2 × 128MB
- Controller Family: HSG80 / HSx80 Fibre Channel Array Controllers
- Cache Type: Controller cache memory
- Application: Fibre Channel RAID controller caching and storage-array performance
- Compatible Systems: HP/Compaq StorageWorks RA8000, MA8000, ESA12000, EMA12000 and HSG80-based storage configurations.
- Compatible Controller: HSG80 controllers including 176622-B21 and related HSx80 controller configurations
- Maximum Cache: Up to 512MB per controller with supported upgrades.
- Included: 2 × 128MB cache modules, providing 256MB total additional cache
- Related Battery: 135823-B21 — HSG80 single external cache battery; required separately for supported battery-backed cache configurations.
- Related Cache Option: 380673-B21 — 64MB HSx80 cache upgrade
- Compatibility Note: 380674-B21 is a cache upgrade kit, not a complete HSG80 controller. It is specifically documented as the 256MB (2 × 128MB) cache upgrade.