I had converted some of my bricks to thin volumes in for using the snapshot feature in the future. Nagios reported that one of the bricks was almost full. It turns out that thin volumes don't reclaim deleted blocks automatically. df and lvs outputs were different. I had to run fstrim manually to reclaim it. I'm surprised that this isn't mentioned clearly in the documentation. Nagios saved me a lot of hassle, which I probably won't have noticed on my own since df reported plenty of space as available. How do I automate it ? I read about some of the discard options, but wasn't very sure. Or is adding a cronjob to do fstrim a better idea ?
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