Re: [Octopus] Beware the on-disk conversion

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If I were to upgrade a host with 18+ 12TB+ OSDs, I would need to
disable the automatic conversion and do them a few at a time?

On Wed, Apr 1, 2020 at 11:28 AM Jack <ceph@xxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> As the upgrade documentation tells:
> > Note that the first time each OSD starts, it will do a format
> > conversion to improve the accounting for “omap” data. This may
> > take a few minutes to as much as a few hours (for an HDD with lots
> > of omap data). You can disable this automatic conversion with:
>
> What the documentation does not say is that this process takes a lot of
> memory
>
> I am upgrading a rusty cluster from Nautilus, you can check out the ram
> consumption as attachment
>
> First, we have a 3TB osd conversion: it tooks ~15min, and 19GB of memory
>
> Then, we have a larger 6TB osd conversion: it tooks more than 2 hours,
> and 35GB of memory
>
> Finally, you have the largest 10TB osd: only 1H15, but 52GB of memory
>
>
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