Weird behavior of PG distribution

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Found a weird behavior (or looks like weird) with ceph 0.67.3

 

I have 5 servers.  Monitor runs on server 1.   And server 2 to 5 have one OSD running each (osd.0 - osd.3)

 

I did a 'ceph pg dump'.  I can see PGs got somehow randomly distributed to all 4 OSDs which is expected behavior.

 

However, if I bring up one OSD in the same server running monitor.   It seems all PGs has their primary ODS move to this new OSD.  After I add a new OSD (osd.4) to the same server running monitor, the 'ceph pg dump' command showing active OSDs as [4,x] for all PGs.

 

Is this expected behavior??

 

Regards,

 

Chen

 

Ching-Cheng Chen

CREDIT SUISSE

Information Technology | MDS - New York, KVBB 41

One Madison Avenue | 10010 New York | United States

Phone +1 212 538 8031 | Mobile +1 732 216 7939

chingcheng.chen@xxxxxxxxxxxxxxxxx | www.credit-suisse.com

 



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