On 5/30/20 1:44 PM, Zygo Blaxell wrote:
On Fri, May 29, 2020 at 06:37:27PM +0200, Goffredo Baroncelli wrote:
On 5/28/20 11:59 PM, Hans van Kranenbu
[...]
What are your thoughts about the chicken/egg situation of changing these
properties only when the filesystem is mounted?
The logic is related only to a chunk allocation. I.e. if you have a not
empty filesystem, after enabling the preferred_metadata "mode", in order
to get the benefit a full balance is required.
Ideally this feature comes with a balance filter that selects block
groups that don't match the current preferred allocation policy, so
you can do a balance on those block groups and leave the rest alone.
There are existing balance filters by devid and stripe count to work from,
so it shouldn't be a lot of new kernel code.
Yes, this could be a further enhancement.
GB
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