Adding community for further help on this.
On Tue, Feb 23, 2016 at 10:57 PM, Vickey Singh <vickey.singh22693@xxxxxxxxx> wrote:
On Tue, Feb 23, 2016 at 9:53 PM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
On Tuesday, February 23, 2016, Vickey Singh <vickey.singh22693@xxxxxxxxx> wrote:Thanks Greg,Do you mean ceph osd map command is not displaying accurate information ?I guess, either of these things are happening with my cluster- ceph osd map is not printing true information- Object to PG mapping is not correct ( one object is mapped to multiple PG's )This is happening for several objects , but the cluster is Healthy.No, you're looking for the map command to do something it was not designed for. If you want to see if an object exists, you will need to use a RADOS client to fetch the object and see if it's there. "map" is a mapping command: given an object name, which PG/OSD does CRUSH map that name to?well your 6th sense is amazing :)This is exactly i want to achieve , i wan to see my PG/OSD mapping for objects. ( basically i have changed my crush hierarchy , now i want to verify that no 2 objects should go to a single host / chassis / rack ) so to verify them i was using ceph osd map command.Is there a smarter way to achieve this ?Need expert suggestion.On Tue, Feb 23, 2016 at 7:20 PM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:This is not a bug. The map command just says which PG/OSD an object maps to; it does not go out and query the osd to see if there actually is such an object.-Greg
On Tuesday, February 23, 2016, Vickey Singh <vickey.singh22693@xxxxxxxxx> wrote:Hello GuysI am getting wired output from osd map. The object does not exists on pool but osd map still shows its PG and OSD on which its stored.So i have rbd device coming from pool 'gold' , this image has an object 'rb.0.10f61.238e1f29.000000002ac5'The below commands verifies this[root@ceph-node1 ~]# rados -p gold ls | grep -i rb.0.10f61.238e1f29.000000002ac5rb.0.10f61.238e1f29.000000002ac5[root@ceph-node1 ~]#This object lives on pool gold and OSD 38,0,20 , which is correct[root@ceph-node1 ~]# ceph osd map gold rb.0.10f61.238e1f29.000000002ac5osdmap e1357 pool 'gold' (1) object 'rb.0.10f61.238e1f29.000000002ac5' -> pg 1.11692600 (1.0) -> up ([38,0,20], p38) acting ([38,0,20], p38)[root@ceph-node1 ~]#Since i don't have object 'rb.0.10f61.238e1f29.000000002ac5' in data and rbd pools , rados ls will not list it. Which is expected.[root@ceph-node1 ~]# rados -p data ls | grep -i rb.0.10f61.238e1f29.000000002ac5[root@ceph-node1 ~]# rados -p rbd ls | grep -i rb.0.10f61.238e1f29.000000002ac5But , how come the object is showing in osd map of pool data and rbd.[root@ceph-node1 ~]# ceph osd map data rb.0.10f61.238e1f29.000000002ac5osdmap e1357 pool 'data' (2) object 'rb.0.10f61.238e1f29.000000002ac5' -> pg 2.11692600 (2.0) -> up ([3,51,29], p3) acting ([3,51,29], p3)[root@ceph-node1 ~]#[root@ceph-node1 ~]# ceph osd map rbd rb.0.10f61.238e1f29.000000002ac5osdmap e1357 pool 'rbd' (0) object 'rb.0.10f61.238e1f29.000000002ac5' -> pg 0.11692600 (0.0) -> up ([41,20,3], p41) acting ([41,20,3], p41)[root@ceph-node1 ~]#In ceph, object is unique and belongs to only one pool. So why does it shows up in all pool's osd map.Is this some kind of BUG in CephCeph Hammer 0.94.5CentOS 7.2
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