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Updated Tiered Storage (markdown)

Chris Lu 2021-03-01 21:35:54 -08:00
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Tiered-Storage.md

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All read and write operation for volume data is O(1) disk seek. However, there are fast, slow, and remote storages.
Since data that are hot, warm, and cold, it would be cost-efficient to place data accordingly.
```
=> NVME => SATA SSD => Fast HDD => Slow HDD => Cloud
=> Critical => Hot => Less Hot => Warm => Cold
```
# Speed up volume index
To write any data, the volume index needs to append one entry. To read any data, the volume index lookup is required. The volume index can be in memory mode or an LevelDB instance. The amount of index content is small while it is accessed frequently.