On 2019/11/21 上午12:36, Christian Pernegger wrote: > Hello, > > I've decided to go with a snapshot-based backup solution for our new > Linux desktops -- thank you for the timely thread --, namely btrbk. > A couple of subvolumes for different stuff, with hourly snapshots that > regularly go to another machine. Brilliant in theory, less so in > practice, because every time btrbk runs, the box'll freeze for a few > seconds, as in, Firefox and LibreOffice, for instance, become entirely > unresponsive, games hang and so on. (AFAICT, all it does is snapshot > each subvolume and delete ones that are out of the retention period.) > > I'm aware that having many snapshots can impact performance of some > operations, but I didn't think that "many" <= 200, "impact" = stop > dead and "some operations" = light desktop use. These are decently > specced, after all (Zen 2 8/12 core, 32 GB RAM, Samsung 970 Evo Plus). > What I'm asking is, is this to be expected, does it just need tuning, > is the hardware buggy, the kernel version (Ubuntu 18.04.3 HWE, their > 5.0 series) a stinker, something else awry ...? Are you using qgroup? With qgroup, snapshot deleting is still a problem though. (But not for snapshot creation, that shouldn't cause any slow down, unless you're using multi-level qgroups) Thanks, Qu > > Cheers, > C. >
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