Home > Storage > PowerStore > Storage Admin > Dell PowerStore Manager Overview > Storage: File Systems
A file system represents a storage resource that provides network file storage. The types of file systems that you can create are determined by the file-sharing protocols (SMB, NFS, or multiprotocol) that are enabled for NAS servers on the PowerStore appliances in your cluster. You can create, view, manage, and delete file systems, SMB shares, and NFS exports from the Storage > File Systems page as shown in Figure 27.
Storage: Quality-of-Service (QoS) is the ability to limit the performance capabilities of a resource. This allows granular prioritization of I/O for storage resources to ensure administrators meet their SLAs within their organization. Limits can be placed on non-critical applications, which frees resources for other applications. PowerStoreOS versions 4.0 and later support QoS for block storage resources. To set QoS on a resource, a Block IO Limit Rule and QoS Policy must be created. The Block IO Limit rule object specifies the type of rule to implement and the metric to limit. Block IO limit rules support Absolute and Density based limits. I/O can be limited using an IOPs limit, bandwidth limit, or a combination of the two. QoS can be found by navigating to Storage > Quality of Service (QoS). For more information about configuring Block QoS Policies and Block IO Limit Rules, see the Dell PowerStore Configuring Volumes guide.