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PowerScale OneFS Web Administration Guide

Setting environment variables for backup and restore operations

You can set environment variables to support the backup and restore operations for your NDMP session.

You can set environment variables through a data management application (DMA) or the command-line interface. Alternatively, you can set global environment variables. The precedence to apply their settings for a backup or restore operation follows:

  • The environment variables specified through a DMA have the highest precedence.
  • Path-specific environment variables specified by the isi ndmp settings variables take the next precedence.
  • Global environment variable settings of "/BACKUP" or "/RESTORE" take the lowest precedence.

You can set environment variables to support different types of backup operations as described in the following scenarios:

  • If the BASE_DATE environment variable is set to any value and if you set the BACKUP_MODE environment variable to SNAPSHOT, the LEVEL environment variable is automatically set to 10 and an Incremental Forever backup is performed.
  • If the BASE_DATE environment variable is set to 0, a full backup is performed.
  • If the BACKUP_MODE environment variable is set to snapshot and the BASE_DATE environment variable is not set to 0, the entries in the dumpdates file are read and compared with the BASE_DATE environment variable. If an entry is found and a prior valid snapshot is found, a faster incremental backup is performed.
  • If the BACKUP_MODE environment variable is set to snapshot, the BASE_DATE environment variable is not set to 0, and if no entries are found in the dumpdates file and no prior valid snapshots are found, a token-based backup is performed using the value of the BASE_DATE environment variable.
  • If the BASE_DATE environment variable is set, the BACKUP_OPTIONS environment variable is set to 0x0001 by default.
  • If the BACKUP_MODE environment variable is set to snapshot, the BACKUP_OPTIONS environment variable is set to 0x0002 by default.
  • If the BACKUP_OPTIONS environment variable is set to 0x0004 , the snapshot is saved and maintained by the application used for the backup process.
  • In order to run an Incremental Forever backup with faster incremental backups, you must set the following environment variables:
    • BASE_DATE=<time>
    • BACKUP_MODE=snapshot
    • BACKUP_OPTIONS=7

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