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Logical Storage Management Guide

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Logical Storage Management Guide Guide PDF

  • Deciding whether to use the Logical Storage Management Guide
    This guide describes how to work with ONTAP FlexVol volumes. It shows you how to create and manage FlexVol volumes, how to use FlexClone technology to create efficient copies of volumes, files, and LUNs, how to create qtrees and quotas, and how to manage efficiency features like deduplication and compression.
  • Creating and managing volumes
    You can create and delete FlexVol volumes, change their basic attributes, and display information about how their space is being used.
  • Moving and copying volumes
    You can move or copy volumes for capacity utilization, improved performance, and to satisfy service-level agreements.
  • Using FlexClone volumes to create efficient copies of your FlexVol volumes
    FlexClone volumes are writable, point-in-time copies of a parent FlexVol volume. FlexClone volumes are space-efficient because they share the same data blocks with their parent FlexVol volumes for common data. The Snapshot copy used to create a FlexClone volume is also shared with the parent volume.
  • Using FlexClone files and FlexClone LUNs to create efficient copies of files and LUNs
    FlexClone files and FlexClone LUNs are writable, space-efficient clones of parent files and parent LUNs, and help in efficient utilization of the physical aggregate space. FlexClone files and FlexClone LUNs are supported only for FlexVol volumes.
  • Using qtrees to partition your FlexVol volumes
    Qtrees enable you to partition your FlexVol volumes into smaller segments that you can manage individually. You can use qtrees to manage quotas, security style, and CIFS oplocks.
  • Logical space reporting and enforcement for volumes
    Beginning with ONTAP 9.5, you can allow the logical space used in a volume and the amount of remaining storage space to be displayed to users. Beginning with 9.5, you can limit the amount of logical space consumed by users.
  • Using quotas to restrict or track resource usage
    Quotas provide a way to restrict or track the disk space and number of files used by a user, group, or qtree. Quotas are applied to a specific FlexVol volume or qtree.
  • Using deduplication, data compression, and data compaction to increase storage efficiency
    You can run deduplication, data compression, and data compaction together or independently to achieve optimal space savings on a FlexVol volume. Deduplication eliminates duplicate data blocks. Data compression compresses the data blocks to reduce the amount of physical storage that is required. Data compaction stores more data in less space to increase storage efficiency.
  • Rehosting a volume from one SVM to another SVM
    Volume rehost enables you to reassign NAS or SAN volumes from one storage virtual machine (SVM, formerly known as Vserver ) to another SVM without requiring a SnapMirror copy. The volume rehost procedures depend upon the protocol type and the volume type. Volume rehost is a disruptive operation for data access and volume management.
  • Storage limits
    There are limits for storage objects that you should consider when planning and managing your storage architecture.
  • Recommended volume and file or LUN configuration combinations
    There are specific combinations of FlexVol volume and file or LUN configurations you can use, depending on your application and administration requirements. Understanding the benefits and costs of these combinations can help you determine the right volume and LUN configuration combination for your environment.
  • Appendix: Cautions and considerations for changing file or directory capacity
    If your data requires a large number of files or very large directories, you can expand ONTAP file or directory capacity. However, you should understand the limitations and caveats for doing so before proceeding.
  • Appendix: Features supported with FlexClone files and FlexClone LUNs
    FlexClone files and FlexClone LUNs work with different ONTAP features, such as deduplication, Snapshot copies, quotas, and volume SnapMirror.
  • Contacting Support
    You can contact Support to obtain help for your issue.
  • Notices
    Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult your local Lenovo representative for information on the products and services currently available in your area.