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OceanStor 9000 V300R006C00 File System Feature Guide 12

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This section introduces Network Backup Management Protocol (NDMP) in terms of the impact on the system, application restrictions, and interaction with other features.

Impact on the System

NDMP backup requires read and write functions of file systems, so it affects other services and decreases system performance. More backup tasks performed at the same time decrease system performance more. You are advised to perform backup services during off-peak hours.

Interaction with Other Features

NDMP backup is related to backup services and will interact with other features related to backup. Table 13-6 shows the details.

Table 13-6  Interaction between NDMP and other features


Interaction with NDMP


  • The NDMP backup window and window of InfoReplicator should not conflict when making the policy. Because if InfoReplicator and NDMP backup service performed at the same time, they will influence the performance by each other.
  • OceanStor 9000 does not support snapshot nesting. If the snapshot used by InfoReplicator does not deleted immediately after service finished, please ensure that the snapshot created by InfoReplicator and the snapshot created by NDMP backup do not have nesting relations.


InfoStamper does not support snapshot nesting. Therefore, when adopting snapshot-based backup, NDMP backup must meet at least one of the following conditions:

  • There is no nesting relationship between directories used by InfoStamper and those used by NDMP backup.
  • The backup window of InfoStamper does not conflict with that of NDMP, although there is nesting relationship between the snapshot directories created by InfoStamper and those for which NDMP backup is to be performed. The snapshots created by InfoStamper have been deleted when the snapshot-based NDMP backup task is started.

Application Restrictions

  • System disks cannot be backed up or recovered.
  • The file recovery path enables files to be recovered only to the file system shared by the OceanStor 9000 but not to system disks.
  • The system time zone or time cannot be adjusted. Daylight saving time (DST) is not supported.
  • If multiple task processes are started to back up multiple directories, and snapshot-based backup is used, nesting relationship cannot exist between backup directories.
  • NDMP backup performance is affected by I/O rates of file systems, transmission rates of tape drives, and backup software performance.
  • NDMP backup only supports NDMP V4.
  • Before starting snapshot-based backup, ensure that file systems support snapshot. Otherwise, backup tasks cannot be performed.
  • Snapshot-based backup creates a snapshot on the current directory. The extended properties of the current directory are not under the protection of the snapshot, so the extended properties of the current directory will not be backed up.
  • NDMP cannot back up hard links when it works based on snapshots, because snapshots cannot be created for hard links, but it can back up hard links when it works based on source directories.
  • NDMP does not support backup of the shared root directory.
  • The full path of parent directories of all backup files can contain a maximum of 4092 characters.
  • The maximum backup path length supported by NDMP backup is determined by the maximum path specifications of OceanStor 9000. For snapshot-based backup, the backup path contains the snapshot path.
    A snapshot path consists of ndmp, a host name, and the time, for example, ndmpnode120150327104425.
  • When connecting the OceanStor 9000 to the TSM backup software, you need to manually set backup directories to be reported.
Updated: 2019-06-27

Document ID: EDOC1000122519

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