Here is what cfhistograms look like. Don't really understand what this means, will try to read. I also %util in iostat continuously 90%. Not sure if this is caused by extra reads by cassandra. It seems unusual.
[root@dsdb4 ~]# nodetool -h `hostname` cfhistograms StressKeyspace
StressStandard
StressKeyspace/StressStandard histograms
Offset SSTables Write Latency Read Latency Row Size
Column Count
1 45720 0 0 0
498857
2 0 0 0 0
0
3 0 0 0 0
0
4 0 0 0 0
0
5 0 0 0 0
0
6 0 0 1 0
0
7 0 0 1 0
0
8 0 0 0 0
0
10 0 0 0 0
0
12 0 0 0 0
0
14 0 0 0 0
0
17 0 1 0 0
0
20 0 2 0 0
0
24 0 1 0 0
0
29 0 6 0 0
0
35 0 68 0 0
0
42 0 509 0 0
0
50 0 1128 0 0
0
60 0 1449 0 0
0
72 0 789 0 0
0
86 0 400 0 0
0
103 0 319 0 0
0
124 0 388 0 0
0
149 0 456 0 0
0
179 0 519 0 0
0
215 0 262 0 0
0
258 0 194 0 0
0
310 0 48 0 0
0
372 0 5 0 0
0
446 0 1 0 0
0
535 0 0 0 0
0
642 0 0 0 0
0
770 0 1 0 0
0
924 0 1 0 0
0
1109 0 0 0 0
0
1331 0 1 0 0
0
1597 0 0 0
0
1916 1 0 0
0
2299 0 0 0
0
2759 0 0 0
0
3311 0 0 0
0
3973 1 0 0
0
4768 5 0 0
0
5722 19 0 0
0
6866 46 0 0
0
8239 102 0 0
0
9887 226 0 0
0
11864 368 0 0
0
14237 572 0 0
0
17084 690 0 0
0
20501 960 0 0
0
24601 1272 0 0
0
29521 1734 0 0
0
35425 2262 0 0
0
42510 2734 0 0
0
51012 3098 0 0
0
61214 3426 0 0
0
73457 3879 0 0
0
88148 4157 0 0
0
105778 4065 0 0
0
126934 3804 0 0
0
152321 2828 0 0
0
182785 1699 0 0
0
219342 821 0 0
0
263210 300 0 249214
0
315852 88 0 149731
0
379022 12 0 0
0
454826 3 0 0
0
545791 0 0 0
0
654949 0 0 0
0
785939 0 0 0
0
943127 0 0 74915
0
1131752 0 0 0
0
1358102 0 0 0
0
1629722 0 0 0
0
1955666 0 0 0
0
2346799 0 0 0
0
2816159 0 0 0
0
3379391 0 0 22438
0
4055269 0 0 0
0
4866323 0 0 0
0
5839588 0 0 2559
0
7007506 0 0 0
0
8409007 0 0 0
0
10090808 0 0 0
0
12108970 0 0 0
0
14530764 0 0 0
0
17436917 0 0 0
0
20924300 0 0 0
0
25109160 0 0 0
0
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