Rados bench behaves oddly

[John Hearns <john@xxxxxxxxxxxxxx>]

We have a CEPH storage cluster which is having problems.

When I run a rados bench I get the behaviour below. Has anyone seen this sort of thing before?

# rados bench -p scbench 10 seq
hints = 1
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
    0       0         0         0         0         0           -           0
    1      16        57        41   163.379       164    0.102551    0.277302
    2      16       102        86   171.653       180   0.0297766    0.273388
    3      16       138       122   162.434       144     0.89867    0.313735
    4      16       172       156    155.82       136   0.0203412    0.327505
    5      16       205       189    151.04       132   0.0997663    0.304306
    6      16       246       230   153.186       164   0.0606922    0.263446
    7      16       269       253   144.444        92   0.0339286    0.247406
    8      16       269       253     126.4         0           -    0.247406
    9      16       269       253   112.363         0           -    0.247406
   10      16       269       253   101.132         0           -    0.247406
   11      16       269       253   91.9418         0           -    0.247406
   12      16       269       253    84.283         0           -    0.247406

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