Qsan XS5224D User Manual page 204

Generally, SSD read cache is particularly effective when:
Reads are far more common than writes in the production environment, common in live

database or web service applications.
The inferior speeds of HDD reads cause performance bottlenecks.

The size of repeatedly accessed data is smaller than the capacity of the SSD cache.

Figure 10-1
SSD read-write cache is particularly effective when:
Reads and writes mix in the production environment, common in file service

applications.
 The inferior speeds of HDD reads and writes cause performance bottlenecks.
Same as SSD read cache case; the size of repeatedly accessed data is smaller than the

capacity of the SSD cache.
 Willing to take a little risk to increase write performance because it's write cache
buffering at SSD cache pool. Of course, these write data in SSD cache can be used at
the next read.
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SSD Read and Write Cache