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Dell PowerStore: Snapshots and Thin Clones
Executive summary Introduction
PowerStore overview
Snapshots overview
Redirect-on-write technology
Terminology
Snapshot operations Snapshot access Snapshot aging Snapshot properties Snapshot rules Snapshot interoperability Thin clone overview Thin clone operations Conclusion Appendix: Technical support and resources

Terminology

Terminology

  • The following table provides definitions for some of the terms that are used in this document.

    Table 1.      Terminology

    Term

    Definition

    Appliance

    Term used for solution containing a base enclosure and any attached expansion shelves. The size of an appliance could be only the base enclosure or the base enclosure plus expansion enclosures.

    Cluster

    Multiple appliances in a single grouping. Clusters can consist of one appliance or more.

    File system

    A storage resource that can be accessed through file sharing protocols such as SMB or NFS.

    NAS server

    A virtualized Network-Attached Storage server that uses the SMB, NFS, or FTP/SFTP protocols to catalog, organize, and transfer files within file system shares and exports. A NAS Server, the basis for multi-tenancy, must be created before you can create file-level storage resources. NAS servers are responsible for the configuration parameters on the set of file systems that it serves.

    Network File System (NFS)

    An access protocol that enables users to access files and folders on a network. NFS is typically used by Linux/UNIX hosts.

    PowerStore T model

    Container-based storage system that is running on purpose-built hardware. This storage system supports unified (block and file) workloads, or block-optimized workloads.

    PowerStore X model

    Container-based storage system that is running inside a virtual machine that is deployed on a VMware hypervisor. In addition to the block-optimized workloads that this storage system offers, it also allows users to deploy applications to be deployed directly on the array.

    PowerStore Manager

    The web-based user interface (UI) for storage management.

    PowerStore Command Line Interface (PSTCLI)

    An interface that allows a user to perform tasks on the storage system by typing commands instead of using the UI.

    Representational State Transfer (REST) API

    A set of resources (objects), operations, and attributes that provide interactive, scripted, and programmatic management control of the PowerStore cluster.

    Server Message Block (SMB)

    An access protocol that allows remote file data access from clients to hosts on a network. This is typically used in Microsoft Windows environments.

    Snapshot

    A point-in-time view of data stored on a storage resource. A user can recover files from a snapshot or restore a storage resource from a snapshot.

    Storage resource

    The top-level object a user can provision, associated with a specific quantity of storage. An example of a storage resource is a volume, volume group, or file system. All host access and data protection activities are performed at this level.

    Thin clone

    A read/write copy of a volume, volume group, file system, NAS server, or snapshot that shares blocks with the parent resource.

    Volume

    A block-level storage device that can be shared using a protocol such as iSCSI or Fibre Channel.

    Volume group

    A storage instance which contains one or more volumes within a storage system.