Qsan XCubeSAN XS5224D, Руководство пользователя

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SSD Cache
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Figure 10-9 Write Data
These steps are:
1. A host requests to write data.
2. Data is written to the SSD cache.
3. The status is returned to the host.
4. Data will be flushed to the HDD volume at the appropriate time.
Flush Write Data to HDD Volume
In SSD read-write cache, the write data will be flushed to the HDD volume in the following
situations.
 Flush data to the HDD volumes before the SSD cache pool is deleted.

Flush data to the HDD volumes before the related volume is disabled.
 Flush data when the system is idle.
CAUTION:
It will take times to flush data from SSD cache to HDD volumes. Please do
not remove SSDs before complete flushing, or it may take risk of losing
data.
TIP:
It won’t flush data to the HDD volumes when system goes shutdown or
reboots.