1.2.7 File Storage Attributes

During file creation, every file in Exascale is associated with file storage attributes, which govern how the file is stored and managed. The attributes are:

• mediaType: Specifies the physical media type that is used to store the file. Exascale uses this attribute to place the file in a storage pool that uses the specified media type. Possible values are:
  • HC: Identifies high capacity storage media, which uses hard disk drives (HDDs).
  • EF: Identifies extreme flash storage media, which uses flash devices.
• redundancy: Specifies the number of data copies that are maintained. Possible values are:
  • normal: Indicates 2 mirrored copies of the file data.
  • high: Indicates 3 mirrored copies of the file data.
• contentType: Specifies the type of content in the file. Exascale internally uses this attribute to place file extents on physically separate devices in a way that maximizes availability if failures occurs. Possible values are:
  • DATA
  • RECO

File storage attributes are assigned to all files when they are created. Typically, the file storage attributes are implicitly assigned using templates, which assign attribute settings based on the file type. File storage attributes can be assigned explicitly when a file is created by using the ESCLI mkfile command.

You cannot change the file storage attributes after the file is created.