Snapshots tripping over each other?

[HarambeLives]

I set a snapshot task for every 15M, every hour, every day and every week

This means that its possible that on 0:00 on a certain day, there could be 4 snapshots running. Its mentioned that checking the box for empty snapshots is allowed to allow this to happen without error. Is this incorrect?

As soon as my hourly snapshot tried to go, it failed with the following error:

Snapshot Task For Dataset "Main Data/<myname>" failed: cannot create snapshot 'Main Data/<myname>@auto-2021-07-30_16-00': dataset already exists no snapshots were created..
2021-07-30 16:00:50 (America/Chicago)

Does this mean its getting confused by the 15 minute snapshots that were taken already, and I need to rename all my tasks so the snapshots don't overlap?

I was hoping not to have duplicate snapshots, and just have the Hourly take the place of the on the hour snapshot from the 15M task, and so on

 

[winnielinnie]

I personally avoid overlapping names from different periodic snapshop tasks. Here are other discussions that cover the gist of it:

Staged snapshot schedule

Hi! How would I best go about creating a schedule that creates snapshots of a dataset like this: 48 hourly 31 daily 48 monthly 12 yearly I think that I should create a separate schedule for each "frequency", but is there a better way?

www.truenas.com

SOLVED - Scheduled Periodic Snapshot Tasks - Never Happen.

Hi I wonder if anyone can throw light on this mystery. One of the features of TrueNAS that first attracted me to it was the idea of scheduled snapshots. Yet despite setting this up when I first built the NAS back in April, with a scheduled weekly snapshot, I find that now, nearly 3 months later...

www.truenas.com

 

[sretalla]

Maybe the best approach would just be to use a rollup script like this one and have only the 15-minute snaps with no (or very long) expiry and let the rollup script remove ones that aren't needed:

zfs-rollup/rollup.py at master · fracai/zfs-rollup

A snapshot pruning script for ZFS, similar in behavior to Apple's TimeMachine. Keep hourly snapshots for the last day, daily for the last week, and weekly thereafter. - fracai/zfs-rollup

github.com

 

[HarambeLives]

Fantastic, thanks guys. This is perfect