On 2017年11月01日 19:04, ST wrote: > Hello, > > I read in different places that one should keep amount of snapshots low > - around 15-20. My question - is this limitation on total number of > snapshots on the system or only on related (parent<->child) chain of > snapshots?
Independent subvolume doesn't count, and it's filesystem based. So only snapshots (with source exists, and still shares a lot of trees with source) counts. And if you have multiple btrfs fses, then the count should be based on each fs. > What I want to do is the following: create (and then rotate) last 7 > daily snapshots (and maybe 4 weekly) for each user in his /home dir. > For > around 100 users. So if limitation is only on related snapshots then I'm > OK since only each 7 (or maybe 7+4) of them are related which is well > under the 15-20 limit. However in total there could be 700 snapshots. So > what is true? You're OK since independent subvolumes won't cause too much stress for backref walk. The only thing you may need to consider is to limit the ability to reflink data between subvolumes. Like cp --reflink or even offline dedupe. Thanks, Qu > > Thank you! > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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