requests are blocked

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Hi

 

I try to run a bench test on a RBD image and I get from time to time the following in ceph status

 

    cluster 046b0180-dc3f-4846-924f-41d9729d48c8

     health HEALTH_WARN

            2 requests are blocked > 32 sec

     monmap e1: 3 mons at {alder=10.6.250.249:6789/0,ash=10.6.250.248:6789/0,aspen=10.6.250.247:6789/0}

            election epoch 18, quorum 0,1,2 aspen,ash,alder

     osdmap e114: 6 osds: 6 up, 6 in

            flags sortbitwise

      pgmap v3816: 192 pgs, 1 pools, 23062 MB data, 5814 objects

            46406 MB used, 44624 GB / 44670 GB avail

                 192 active+clean

  client io 6083 B/s rd, 18884 kB/s wr, 75 op/s

 

 

what does  “requests are blocked” mean ? and performance drops to almost  0 ?

I am running infernalis version on Centos 7 kernel 3.10.0-327.3.1.el7.x86_64

 

Thanks

--

Dan

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