Re: interesting crush rules

[Arne Wiebalck <Arne.Wiebalck@xxxxxxx>]

On May 1, 2013, at 11:44 PM, Sage Weil <sage@xxxxxxxxxxx>

 wrote:

I added a blueprint for extending the crush rule language.  If there are
interesting or strange placement policies you'd like to do and aren't able
to currently express using CRUSH, please help us out by enumerating them
on that blueprint.

I added an item to prioritise the replica size over the currently configured buckets:

give the number of replicas priority over the available buckets, e.g.: if the replication

size is N and the rule says put them in different rooms (or racks, ...), but there are only

M<N rooms (or racks, ...), create none the less N replicas and distribute them using

all of the M rooms (let some rooms (or racks, ...) have more than one replica)

Cheers,

 Arne

--

Arne Wiebalck
CERN IT

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