ceph -s

   health HEALTH_WARN mds a,b,c,d are laggy
   monmap e9: 4 mons at {a=192.168.1.3:6789/0,b=192.168.1.5:6789/0,c=192.168.1.4:6789/0,d=192.168.1.6:6789/0}, election epoch 4, quorum 0,1,2,3 a,b,c,d
   osdmap e978: 8 osds: 8 up, 8 in
    pgmap v30362: 776 pgs: 776 active+clean; 61741 MB data, 123 GB used, 857 GB / 990 GB avail
   mdsmap e2785: 8/8/8 up {0=d=up:resolve(laggy or crashed),1=d=up:resolve(laggy or crashed),2=b=up:resolve(laggy or crashed),3=c=up:resolve(laggy or crashed),4=a=up:replay(laggy or crashed),5=c=up:replay(laggy or crashed),6=b=up:resolve(laggy or crashed),7=a=up:active(laggy or crashed)}