HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 62

Table 1-1 Caching Recommendations for Disk Configurations
Disk configuration
RAID-5
RAID-3
RAID-1
RAID-1/0
Table 1-2 Utilities for Various Cache Operations
Cache operation
Specify basic cache parameters
Enable/disable storage system
cache
Enable/disable read and/or write
cache for individual LUNs
Auto-Trespass
1-20 Disk Array High Availability Features
Read caching Write caching
Recommended Highly recommended
Not allowed Not allowed
Recommended Acceptable
Recommended Acceptable
Grid Manager
Yes
Yes
Yes
SAM STM
No Yes
No Yes
Yes Yes