purgewhenfull does not list matches but works in the background

[Luan]

Hi,

I added a new storage area according to the video https://www.youtube.com/watch?v=ElXdmx9FsKQ

When I open the filter and click on "List Matches" no results are found, but in the background zoneminder has reduced disk space.

What can it be?

[Andyrh]

The filter runs in the background successfully every 10(?) minutes. When you run it, is there anything to match?
Try setting the threshold lower to force matches.

[Luan]

I don't know how often, but the filter runs in the background as I see disk space decreasing. However, if I put matches to list in the filter, nothing appears. There are no errors in the logs either.

[Andyrh]

Search your log for zmfiler_# Where the number is the filter number. This will show you what the filter has done.

When my PurgeWhenOld filter is run to list matches it shows nothing. If I change the age from -60 to -50 it lists many matches. Have you done something similar?

[Luan]

Yes, see the attachment.

[bbunge]

Well, when the filter runs in the background it deletes the first 100 matches. The question is how far below 20% does this take your storage? If you run the filter manually and the disk is not over 20% you will get no matches.

I find purge when full to not be a good way to manage storage. It is better used as a backup to keep the system operating if other purge filters fail. O purge events based on days not disk percent. I also set the purge when full to 85% as I've had bad experiences with it set at 95%.

[dougmccrary]

I also set the purge when full to 85% as I've had bad experiences with it set at 95%.

Yes. That's due to the default 5% reserve when formatting. So 95% + 5% = 100%. So out of space between filter runs is easily possible.
93 or 94 should be OK, at least most of the time.

[Andyrh]

From you screen shot I am not sure why it would not have matches. Disco1 is at 45% and the filter is set to 20%. I would expect matches from what I am seeing.

[dougmccrary]

From you screen shot I am not sure why it would not have matches. Disco1 is at 45% and the filter is set to 20%. I would expect matches from what I am seeing.

ISTR the diff is the test uses php and the actual filter uses real sql. or something like that.
Anyway, I've seen this since forever, and just test it/them IRL, monitoring closely.