The root volume must have enough space to contain system files, log files, and core files. If a system problem occurs, these files are needed to provide technical support.
In contrast with traditional volumes, it is possible to create a FlexVol volume that is too small to be used as the root volume. Data ONTAP prevents you from setting the root option on a FlexVol volume that is smaller than the minimum root volume size for your storage system model, and prevents you from resizing the root volume below the minimum allowed size.
A root FlexVol volume must have a space guarantee of volume. Data ONTAP prevents you from setting the root option on a FlexVol volume that does not have a space guarantee of volume, and prevents you from changing the space guarantee for the root volume.
The minimum size for a root FlexVol volume depends on your storage system model. The following table lists the minimum allowed size for root volumes.