On Nov 28, 2024, at 2:53 AM, Eugen Block <eblock@xxxxxx> wrote:
Of course it's possible. You can either change this rule by
extracting the crushmap, decompiling it, editing the "take"
section, compile it and inject it back into the cluster. Or you
simply create a new rule with the class hdd specified and set this
new rule for your pools. So the first approach would be:
1. ceph osd getcrushmap -o crushmap.bin
2. crushtool -d crushmap.bin -o crushmap.txt
3. open crushmap.txt with the editor of your choice, replace
step take default
with:
step take default class hdd
and save the file.
4. crushtool -c crushmap.txt -o crushmap.new
5. test it with crushtool:
crushtool -i crushmap.new --test --rule 1 --num-rep 5 --show-mappings | less
crushtool -i crushmap.new --test --rule 1 --num-rep 5
--show-bad-mappings | less
You shouldn't have bad mappings if everything is okay. Inspect the
result of --show-mappings to see if the OSDs match your HDD OSDs.
6. ceph osd setcrushmap -i crushmap.new
####
Alternatively, create a new rule if your EC profile(s) already have
the correct crush-device-class set. If not, you can create a new
one, but keep in mind that you can't change the k and m values for
a given pool, so you need to ensure that you use the same k and m
values:
ceph osd erasure-code-profile set ec-profile-k3m2 k=3 m=2
crush-failure-domain=host crush-device-class=hdd
ceph osd crush rule create-erasure rule-ec-k3m2 ec-profile-k3m2
And here's the result:
ceph osd crush rule dump rule-ec-k3m2 | grep -A2 take
"op": "take",
"item": -2,
"item_name": "default~hdd"
Regards,
Eugen
Zitat von Rok Jaklič <rjaklic@xxxxxxxxx>:
Hi,
is it possible to set/change following already used rule to only use hdd?
{
"rule_id": 1,
"rule_name": "ec32",
"type": 3,
"steps": [
{
"op": "set_chooseleaf_tries",
"num": 5
},
{
"op": "set_choose_tries",
"num": 100
},
{
"op": "take",
"item": -1,
"item_name": "default"
},
{
"op": "chooseleaf_indep",
"num": 0,
"type": "host"
},
{
"op": "emit"
}
]
}
Kind regards,
Rok
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