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FAQ: SANtricity Snapshot feature

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Applies to

  • SANtricity OS
  • Snapshot

Answer

  • What if reserved repository alert threshold is reached?
Failure entry as below is seen on Recovery Guru, but snapshot images won't be purged:
 
Failure Entry 1: PIT_GROUP_REPOSITORY_OVER_THRESHOLD-Recovery Failure Type Code: 405
Storage array: array1
Base volume: volume1
Snapshot group: SG
Status: Over Threshold
Used repository capacity: 9,216 GB (90%)
Remaining repository capacity: 1,024 GB (10%)
Repository alert threshold: 75%
 
  • What if reserved capacity is full?
Depends on the setting of Policy for full reserved capacity:
Purge oldest snapshot image (Recommended): Snapshot images are purged if reserved capacity is full. Reads and writes to base volume are not impacted.
Reject writes to base volume (keep snapshot images valid): Writes to base volume fail but snapshot images are kept. Reads to base volume are not impacted.
SANtricity Snapshot feature
 
  • Is a purged snapshot image consuming space in reserved capacity?
No. See below information in SNAPSHOT IMAGES section in file STORAGE-ARRAY-PROFILE of a Support Bundle for example, the Repository Usage of Purged images are Not applicable:
 
Timestamp                Type      Status     Associated Element     Associated Snapshot Volumes     Creation Method     Repository Usage
3/1/23, 8:00:00 PM UTC   Standard  Purged     DAILY                  Not applicable                  Scheduled           Not applicable
3/2/23, 8:00:00 PM UTC   Standard  Purged     DAILY                  Not applicable                  Scheduled           Not applicable
3/3/23, 8:00:00 PM UTC   Standard  Optimal    DAILY                  Not applicable                  Scheduled           1234 GB
3/4/23, 8:00:00 PM UTC   Standard  Optimal    DAILY                  Not applicable                  Scheduled           5678 GB
 
  • Ensure the maximum number of snapshots per snapshot group does not go over the maximum for the array. 
    • The maximum for most arrays is 512. 
    • The maximum number of snapshots for a consistency group is per volume. 
  • Can the base volume be rollback using a purged image?
No. Data within a purged image has been deleted, rollback using the image is impossible.

Additional Information

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