Which questions do you have? When I first started to deal with crush
rules I was overwhelmed, but with a bit of practice and trial & error
you're going to figure it out.
Maybe this helps a bit (inline comments):
id 6 -> self explanatory
type erasure -> self explanatory
step set_chooseleaf_tries 5 -> stick to defaults, usually works
(number of max attempts to find suitable OSDs)
step set_choose_tries 100 -> stick to defaults, usually works (number
of max attempts to find suitable buckets, e.g. hosts)
step take default class test -> "default" is the usual default crush
root (check 'ceph osd tree'), you can specify other roots if you have
them
step chooseleaf indep 0 type host -> within bucket "root" (from "step
take default") choose {pool-num-replicas} hosts
step emit -> execute
There are more details in [0].
@Marc: I guess one could argue about that. On the one hand, those
three device classes you mention are discovered automatically when
OSDs are added (depending on controllers, etc.), so an operator
doesn't have to deal with it. Just create rules using those classes.
On the other hand, some users like to have full control over
everything and don't need that kind of automatic discovery.
[0]
https://docs.ceph.com/en/latest/rados/operations/crush-map-edits/#crush-map-rules
Zitat von Andre Tann <atann@xxxxxxxxxxxx>:
Hi yall,
Am 29.11.24 um 08:51 schrieb Eugen Block:
rule testrule {
id 6
type erasure
step set_chooseleaf_tries 5
step set_choose_tries 100
step take default class test
step chooseleaf indep 0 type host
step emit
}
Does anyone know a good and comprehensive discussion about all the
options for a crush rule, and what they do.
Of course I know the original documentation, but I find that too
short, and leaves me with many questions.
Thanks for any hints.
--
Andre Tann
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