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Forum Discussion
aks-2
Sep 07, 2026Apprentice
RN214 OS6.10.10 Snapshots
I found this post from 2021, but I am not seeing what I expect from snapshots. I have had this config for a long time, let's assume >2Y. I expected a monthly snapshot to be retained, as the d...
aks-2
Sep 07, 2026Apprentice
Also, current snapshot size is only 627MB, so I'm not sure it's a size problem. Maybe quantity limit?
StephenB
Sep 07, 2026Guru - Experienced User
aks-2 wrote:volume settings>snapshot pruning is set to 90%.
Which is the default, and it seems unlikely that you'd have gotten anywhere close to that that theshold at the beginning of August.
aks-2 wrote:Also, current snapshot size is only 627MB, so I'm not sure it's a size problem. Maybe quantity limit?
That shouldn't matter.
aks-2 wrote:I expected a monthly snapshot to be retained, as the daily>weekly>monthly promoted snapshots are cleared out - specifically the last bullet point above.
Have you downloaded the log zip file? There could be useful clues in there.
As an aside, I personally don't recommend "smart" snapshots (and won't use them myself). The reason is that the the monthly snapshots are retained for ever - which will eventually result in a full volume. Instead I set a reasonable snapshot retention limit, and only write snapshots when something in the share has change.
- aks-2Sep 08, 2026Apprentice
Thanks, I will look at the custom snapshots.
The logs look vanilla with no extra useful info, but seem to indicate a long history of snaphots >160:
Config: 4, subvolume: /data/Shared Type | # | Pre # | Date | User | Cleanup | Description | Userdata -------+-----+-------+----------------------------------+------+---------+-------------+-------------------------------------- single | 0 | | | root | | current | single | 161 | | Wed 12 Aug 2026 12:00:07 AM WEST | root | | | snapshot=c_1786489206 single | 162 | | Thu 13 Aug 2026 12:00:08 AM WEST | root | | | snapshot=c_1786575608 single | 163 | | Sun 16 Aug 2026 12:00:09 AM WEST | root | | | snapshot=c_1786834809 single | 164 | | Mon 17 Aug 2026 12:00:13 AM WEST | root | | | snapshot=c_1786921212 single | 165 | | Tue 18 Aug 2026 12:00:26 AM WEST | root | | | snapshot=c_1787007626 single | 166 | | Thu 20 Aug 2026 12:00:02 AM WEST | root | | | snapshot=c_1787180402 single | 167 | | Fri 21 Aug 2026 12:00:06 AM WEST | root | | | snapshot=c_1787266805 single | 168 | | Sat 29 Aug 2026 12:00:08 AM WEST | root | | | snapshot=c_1787958007 single | 169 | | Sun 30 Aug 2026 12:00:11 AM WEST | root | | | snapshot=c_1788044411 single | 170 | | Mon 31 Aug 2026 12:00:13 AM WEST | root | | | snapshot=c_1788130813 single | 171 | | Sat 05 Sep 2026 11:39:24 PM WEST | root | | | snapshot=m_Manual-snapshot-2026-09-05 single | 172 | | Sun 06 Sep 2026 12:00:01 AM WEST | root | | | snapshot=c_1788649200The snapshot config for this share has this line at the end of the file:
SNAPSHOT_HWM="172"I created a new smart snapshot on another share that has previously never had snapshots, created a manual snapshot, and then the config had "SNAPSHOT_HWM=1" line. Seems to just be an incrementing counter.
The NAS status log has entries deleting the snapshots periodically, so I will analyse the log and come back with an update and details.
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