You should decide how you want to allocate space for LUNs and Snapshot copies
before you configure your volume or set up your LUNs. Do you want to allocate space ahead
of time, or do you want to allocate space as you need the space?
You can pre-allocate space or add space as required for your LUNs and Snapshot copies in your volume. You must answer the following questions to determine the type of LUNs and Snapshot copies that work best in your environment:
- Do you want to allocate space on your volume as needed for your LUNs and Snapshot copies?
- Do you want to pre-allocate space on your volume for your LUNs and Snapshot copies?
- Do you want to pre-allocate space on your volume for your LUNs but allocate space as needed for your Snapshot copies?
- How closely do you need to monitor your environment?
- Will the amount of data in your LUNs grow quickly?
How you answer these questions determines which of the three common usage scenarios for allocating space in your volume for your LUNs and Snapshot copies works best for your environment. The three common usage scenarios are as follows:
- Thinly provisioned LUNs without Snapshot reserve
- Space-reserved LUNs without Snapshot reserve
- Space-reserved LUNs with Snapshot reserve
- Thinly provisioned LUNs with volume autosize enabled