Scheduled SnapSync - Permanent SnapShots?

English Backup and data protection
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1

I have two H1288X boxes that are identical in specs; 128GB RAM, 192TB storage, running QuTS h5.2.9.3499. The boxes are in separate locations, connected via a VPN. The WAN / VPN is too slow to do real-time snapsync, so we tried scheduled SnapSync. It seems to work well and makes recovering from a failure scenario easy. However, I noticed that each LUN we’re syncing now have over 2000 snapshots. Before we configured scheduled SnapSync, there were zero snapshots on each LUN. SnapSync seems to use permanent snapshots and they don’t follow the normal retention configuration. Is this normal behavior? If I’m syncing multiple LUNs every 5 or 10mins, I supposed I could hit the max number of snapshots on the NAS within a year, and that wouldn’t be good. Could someone from product management provide some insight? Am I better off using snapshot replica instead?

2

As a heads up, this was also posted on reddit

(besides a reply from @QNAPDaniel, no further findings)

3

thanks dolbyman :slight_smile: I added some more context here.

4

Here are some pictures of a scheduled snapsync created yesterday on a test LUN. Started with zero snapshots and we’re up to over 160 permanent snapshots. The number will continue to grow until we hit the max…

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H2hZAWI5AD1492×766 104 KB

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firefox_7ujPoPar4X1234×568 36.9 KB

firefox_HDjAwT1rUj
firefox_HDjAwT1rUj1096×666 77.3 KB

5

Thanks for the report! I’ll forward this issue to the relevant team for verification.