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Dell Storage Manager 2020 R1 Administrator's Guide

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Consistent and Non-Consistent Snapshot Profiles

When a snapshot is taken for a volume, I/O is halted to allow the operation to take place. A consistent snapshot profile stops I/O to all associated volumes until a snapshot is taken for each volume, ensuring that the snapshots contain data for the same time period. A non-consistent snapshot profile creates snapshots for associated volumes without guaranteeing that the snapshots will finish at the same time, which is less resource intensive.

Table 1. Snapshot profilesA table that compares consistent and non-consistent snapshot profiles.
Consistent Snapshot Profile Non-Consistent Snapshot Profile
Stops I/O across all volumes as a group Stops I/O for each volume independently of other volumes.
Resource intensive Less resource intensive—depends on the amount of data that is written since the previous snapshot
Number of volumes limited based on the storage controller.
  • SC8000, SC9000, SC7020, and SC7020F: 100
  • SC5020 and SC5020F: 50
  • SC4020: 40
  • SCv2000 and SCv3000 series: 25
No limit to the number of volumes to which the snapshot profile is attached
Snapshots are taken of all volumes simultaneously Choose between standard (one volume at a time) or parallel (all volumes simultaneously)
Can set an alert if snapshots cannot be completed within a defined time. Snapshots not completed before alert is generated are not taken. (This suspension can lead to incomplete groups of snapshots across volumes.) All snapshots are taken
Can delete incomplete group of snapshots All snapshots are taken
Can be converted to a Non-Consistent snapshot profile Can be converted to a Consistent snapshot profile

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