Re: ceph fs dir-layouts and sub-directory mounts

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On Mon, Feb 3, 2020 at 1:09 AM Frank Schilder <frans@xxxxxx> wrote:
> Fortunately, I had an opportunity to migrate the ceph fs. For anyone who starts new, I would recommend to have the 3-pool layout right from the beginning. Never use an EC pool as the default data pool. I would even make this statement a bit stronger in the ceph documentation:
>
>     If erasure-coded pools are planned for the file system, it is usually better to use a replicated pool for the default data pool ...
>
> to, for example,
>
>     If erasure-coded pools are planned for the file system, it is strongly recommended to use a replicated pool for the default data pool ...

We're going even further by having the monitors warn you if you try to
do this: https://tracker.ceph.com/issues/42450

Backports to Nautilus and Mimic are already in flight.

-- 
Patrick Donnelly, Ph.D.
He / Him / His
Senior Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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