Thick LUs, on the other hand, are block storage volumes that are allocated a fixed amount of physical storage space. This means that even if only a small amount of data is written to a thick LU, the entire allocated storage space is reserved and cannot be used by other LUs. Thick LUs are typically used for workloads that require consistent performance and low latency, as they do not experience the same performance degradation as thin LUs when the physical storage device becomes full.
Here is a table summarizing the key differences between thin and thick LUs:
| Feature | Thin LU | Thick LU |
|---|---|---|
| Capacity | Provisioned with a specified capacity, but only occupies the physical storage space that is actually written to them | Allocated a fixed amount of physical storage space |
| Space efficiency | More space-efficient, especially for workloads that do not write to all of the allocated capacity | Less space-efficient, as the entire allocated storage space is reserved even if only a small amount of data is written |
| Performance | May experience performance degradation as the physical storage device becomes full | Typically provide consistent performance and low latency, as they do not experience the same performance degradation as thin LUs when the physical storage device becomes full |
| Use cases | Ideal for workloads that do not require consistent performance and low latency, such as development and test environments | Ideal for workloads that require consistent performance and low latency, such as production databases and virtual machines |
In general, thin LUs are a good choice for workloads that are space-efficient and do not require consistent performance and low latency. Thick LUs are a good choice for workloads that require consistent performance and low latency and can afford to use more physical storage space.
