D-Link DSN-6210 User Manual - Page 133

Read Data with Cache Hit, Read from HDD

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D-Link Document - User Manual 1. Request Read 3. Return Data Memory Cache Data 4. Populate Cache 2. Read from HDD SSD HDD The following steps describe details about a host read with a cache miss: 1. A host requests a read data. 2. Read data from the HDD. 3. Return requested data to the host. 4. Populate the cache to SSD.  Read Data with Cache Hit The following figure shows the steps of the controller which handles a host read request when the data is in the SSD cache. 1. Read 3. Return Data Memory Cache Data 2. Read from SSD SSD 4. Read from HDD (SSD Failure Case) HDD Copyright@2014 D-Link System, Inc. All Rights Reserved. 133

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D-Link Document – User Manual
The following steps describe details about a host read with a cache miss:
1.
A host requests a read data.
2.
Read data from the HDD.
3.
Return requested data to the host.
4.
Populate the cache to SSD.
Read Data with Cache Hit
The following figure shows the steps of the controller which handles a host read request when the
data is in the SSD cache.
HDD
SSD
Memory Cache
Data
2. Read from HDD
4. Populate Cache
1. Request Read
3. Return Data
SSD
HDD
Memory Cache
Data
4. Read from HDD
(SSD Failure Case)
2. Read from SSD
1. Read
3. Return Data
133
Copyright@2014 D-Link System, Inc. All Rights Reserved.