Hello,
This is for a cluster currently running at 14.2.7. Since our cluster is
still relatively small we feel a strong need to run our CephFS on an EC
Pool (8 + 2) and Crush Failure Domain = OSD to maximize capacity.
I have read and re-read
https://docs.ceph.com/docs/nautilus/cephfs/createfs/#creating-pools and
https://docs.ceph.com/docs/nautilus/cephfs/file-layouts/#file-layouts,
but it still isn't quite clear to me. Since this topic is mentioned in
the release notes for 14.2.8 I thought I should probably ask so I can
configure this correctly.
If using a small replicated pool as the default data pool, how does one
use a file layout induce the bulk of the data to be stored in the
secondary EC data pool? From the links referenced I infer that a file
layout is required. Is it possible to have a file layout based solely
on size?
BTW, we want to do this in a way that we don't have to think about which
directory goes with which file size or anything like that. This needs
to be an internal detail that is completely hidden from the client.
Also, is it possible to insert a replicated data pool as the default on
an already deployed CephFS, or will I need to create a new FS and copy
the data over?
Thanks.
-Dave
--
Dave Hall
Binghamton University
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