Snapshot; Table 72 Maximum Number Of Generations (Per Eternus Dx Or Volume) And Number Of Target Volumes For Snapshots - Fujitsu ETERNUS DX S5 Series Design Manual

4. NAS Functions

Snapshot

Snapshot
Snapshot is a function that automatically backs up volume data at a certain point. Unlike usual backup copies,
this function only copies differential data from the source volume data. Therefore, the disk space necessary for
backup is reduced.
Acquiring snapshots of the NAS user volume enables file restoration from a snapshot even if a file is deleted by
mistake. Data can be restored from a client.
Snapshot is a standard function of the Unified License. It can be used regardless of whether the Advanced Copy
license is registered.
Automatic and Manual are available as acquisition modes.
For necessary settings to acquire snapshots, refer to "Basic Settings for Snapshot" in "Configuration/Operation
Guide (NAS)". For restoration operations, refer to "Snapshot Restoration" in "Configuration/Operation Guide
(NAS)".
Data in the snapshot destination has been assigned Read only (r) for the access permission and can only be
referenced from the client.
The following table shows the maximum number of snapshot generations that can be acquired and the
maximum number of target volumes.
Table 72 Maximum Number of Generations (per ETERNUS DX or Volume) and Number of Target Volumes for
Snapshots
Model
ETERNUS DX100 S5
ETERNUS DX200 S5
ETERNUS DX500 S5
ETERNUS DX600 S5
*1: Maximum number of generations in the ETERNUS DX (or the total number of generations acquired in Automatic mode and the number
of generations acquired in Manual mode).
Target volume number
2
4
4
8
192
Maximum number of
generations (per ETERNUS DX)
(*1)
64
128
128
256
Maximum number of
generations (per volume) (*1)
64
128
128
128
Design Guide