In this case it's not so much moving data off as those PGs catching up with 
writes that came in duringthat interval.

That said, 1.5% and taking 10 hours seems like a lot.  Something's awry.  

`ceph df`
`ceph osd df`
`ceph osd df tree`
`ceph osd dump | grep pool`
`ceph config dump`



> On Sep 22, 2025, at 8:42 AM, Niklas Hambüchen <m...@nh2.me> wrote:
> 
>> Well, if they were away long enough to get "out", then it is somewhat 
>> reasonable even for ~5m downtimes.
> 
> Right, but what I'm saying is that this is not what happens.
> 
> My reboot or disconnect takes < 5 minutes, and no OSD is `out` afterwards.
> 
> When I say "down for 5 minutes", I literally mean that the node goes down, 
> comes back up, and I'm sitting in front of its terminal and observe that all 
> OSDs are `up` and `in`.
> 
> Of course your explanation of what happens if it's `out` makes sense, but 
> that isn't my scenario; if Ceph had 10 hours to move data off, of course I 
> would have to expect at least 10 hours to move data back on. But it only has 
> 5 minutes at max to move data off.
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