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10.2.4.
Read/Write Cache Cases
The following describes the read/write cache cases. In SSD read cache, the processes of
read/write data will be disassembled to the following cases.
Read Data with Cache Miss
Read Data with Cache Hit
Write Data in SSD Read Cache
Besides, in SSD read-write cache, the processes of read data are the same as above. But the
write data is different.
Read Data with Cache Miss
Read Data with Cache Hit
Write Data in SSD Read-write Cache
Each case will be described below.
Read Data with Cache Miss
The following figure shows how the controller handles a host read request when some or all
of the data are not in the SSD cache.
Figure 10-6
Read Data with Cache Miss
These steps are:
1.
A host requests to read data. The system will check if the requested data is in memory
cache or SSD cache. If not, it is called cache miss.
2.
Data is read from the HDD volume because of cache miss.
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