Configuring read caching

Server and Cluster Administration Guide for Hitachi NAS Platform

Part Number

A storage server can support read caching under the following conditions:

  • License keys to enable the read caching service and the Network File System (NFS) service must be installed.
  • Sufficient space must be available in a storage pool to create the read cache.

Additionally, to support remote read caching:

  • The storage server must be configured as a part of cluster.
  • The cluster name space (CNS) feature must be properly licensed and configured.
Note: After the read cache license key is entered, the server/cluster must be restarted before the read caching service starts.
Before you can configure the read caching service, you must have already fulfilled the prerequisites.

To enable and configure read caching, you must:

  1. Enable the read caching service.
    To enable read caching, you must add the license key for read caching. After the key has been added, the service will be enabled upon restart.
  2. Create a read cache on an EVS.
    Because a read cache is a kind of file system, the same procedure that creates file systems also creates read caches. For information about creating a read cache or a file system, refer to the File Services Administration Guide.
  3. Enable file caching.
    The configuration can specify that files from some file systems should be cached, while prohibiting file caching for files from other file systems. To control the caching of files from a file system, select the file caching option when you add the file system link or export.
  4. Set file caching options.
    To control which files are eligible for caching, you must configure the file caching options. After a file system link has been added to the CNS tree, the file system link options can be changed to control whether files from this file system can be cached.