RIak Bitcask primary partition Failed to merge

[Konstantin74R]

Hi, All!
riak 2.1.1
backend multi
n_val = 3
In log /var/log/riak/crash.log often writes event. Primary partition. Please help. What can I do?
Failed to merge {[ "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2689.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2681.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2943.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2940.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2938.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2936.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2932.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2930.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2928.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2926.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2924.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2922.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2920.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2918.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2916.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2914.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2912.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2910.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2908.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2906.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2904.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2900.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2898.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2890.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2886.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2882.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2880.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2878.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2876.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2872.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2870.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2868.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2866.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2864.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2814.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2812.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2810.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2808.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2806.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2802.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/446.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2896.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2894.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2892.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2888.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2691.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2884.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2695.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2693.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2679.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2677.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2874.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2934.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2609.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2585.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2902.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2798.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2790.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2448.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2446.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2707.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2721.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2719.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2717.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2715.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2713.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2711.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2709.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2699.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2697.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/3.bitcask.data", "/u01/riak/bitcask/59944403093650315004448010716878795728075358208/2.bitcask.data"],[]}: {generic_failure,error,{try_clause,{error,eio}}, [{bitcask,merge_files,1,[{file,"src/bitcask.erl"},{line,1358}]}, {bitcask,merge1,4,[{file,"src/bitcask.erl"},{line,701}]}, {bitcask,merge,3,[{file,"src/bitcask.erl"},{line,580}]}, {bitcask_merge_worker,do_merge,1,[{file,"src/bitcask_merge_worker.erl"},{line,195}]}]}