Yes,
I know you can do that. I parsed this very output, then wrote a script to verify. I did not read in the crush map, but used my own knowledge of the crush rule to verify the placements.
It would be nice to have a way to do this for an arbitrary crush rule and a pool using it.
-Chris
-----Original Message-----
From: Stephen Smith6 <esmith@xxxxxxx>
To: Christopher Durham <caduceus42@xxxxxxx>; ceph-users@xxxxxxx <ceph-users@xxxxxxx>
Sent: Wed, Jan 11, 2023 2:00 pm
Subject: Re: pg mapping verification
#yiv3876159325 filtered {}#yiv3876159325 filtered {}#yiv3876159325 p.yiv3876159325MsoNormal, #yiv3876159325 li.yiv3876159325MsoNormal, #yiv3876159325 div.yiv3876159325MsoNormal {margin:0in;font-size:10.0pt;font-family:sans-serif;}#yiv3876159325 a:link, #yiv3876159325 span.yiv3876159325MsoHyperlink {color:blue;text-decoration:underline;}#yiv3876159325 span.yiv3876159325EmailStyle19 {font-family:sans-serif;color:windowtext;}#yiv3876159325 .yiv3876159325MsoChpDefault {font-size:10.0pt;}#yiv3876159325 filtered {}#yiv3876159325 div.yiv3876159325WordSection1 {}I think “ceph pg dump” is what you’re after, look for the “UP” and “ACTIVE” fields to map a PG to an OSD. From there it’s just a matter of verifying your PG placement matches the CRUSH rule. From:Christopher Durham <caduceus42@xxxxxxx>
Date: Wednesday, January 11, 2023 at 3:56 PM
To: ceph-users@xxxxxxx <ceph-users@xxxxxxx>
Subject: [EXTERNAL] pg mapping verification
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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