Re: osd_memory_target for low-memory machines

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can you share `ceph daemon osd.8 config show` and `ceph config dump`?


On Sun, Oct 2, 2022 at 5:10 AM Nicola Mori <mori@xxxxxxxxxx> wrote:

> Dear Ceph users,
>
> I put together a cluster by reusing some (very) old machines with low
> amounts of RAM, as low as 4 GB for the worst case. I'd need to set
> osd_memory_target properly to avoid going OOM, but it seems there is a
> lower limit preventing me to do so consistently:
>
> 1) in the cluster logs I continuously get this message:
>
>    Unable to set osd_memory_target on ceph01 to 402653184: error parsing
> value: Value '831882342' is below minimum 939524096
>
> 2) if I try to set it manually I get this error:
>
>    # ceph config set osd.7 osd_memory_target 402653184
>    Error EINVAL: error parsing value: Value '402653184' is below minimum
> 939524096
>
> 3) if I use the --force option then the value is set, but it is lost
> after a osd restart
>
> How can I fix this issue?
> Thanks,
>
> Nicola
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