Hi,
I don't have an automation for that. I test a couple of random pg
mappings if they meet my requirements, usually I do that directly with
the output of crushtool. Here's one example from a small test cluster
with three different rooms in the crushmap:
# test cluster (note that the columns may differ between ceph versions
when using awk as I did here)
storage01:~ # ceph pg ls-by-pool <pool> | awk '{print $15}'
ACTING
[8,13,5]p8
[22,4,13]p22
[28,22,26]p28
[21,5,1]p21
[20,34,27]p20
[...]
for i in {20,34,27}; do ceph osd find $i | grep room; done
"room": "room2",
"room": "room3",
"room": "room1",
For this rule I have a room resiliency requirement so I grep for the
room of each acting set.
The output of crushtool is helpful if you don't want to inject a new
osdmap into a production cluster. Just one example:
crushtool -i crushmap.bin --test --rule 5 --show-mappings --num-rep 6 | head
CRUSH rule 5 x 0 [19,7,13,22,16,28]
CRUSH rule 5 x 1 [21,3,15,31,19,7]
[...]
Regards,
Eugen
Zitat von Christopher Durham <caduceus42@xxxxxxx>:
Hi,
For a given crush rule and pool that uses it, how can I verify hat
the pgs in that pool folllow the rule? I have a requirement to
'prove' that the pgs are mapping correctly.
I see: https://pypi.org/project/crush/
This allows me to read in a crushmap file that I could then use to
verify a pg with some scripting, but this pypi is very old and seems
not to be maintained or updatedsince 2017.
I am sure there is a way, using osdmaptool or something else, but it
is not obvious. Before i spend alot of time searching, I thought I
would ask here.
Basically, having a list of pgs like this:
[[1,2,3,4,5],[2,3,4,5,6],...]
Given a read-in crushmap and a specific rule therein, I want to
verify that all pgs in my list are consistent with the rule specified.
Let me know if there is a proper way to do this, and thanks.
-Chris
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