fun example that shows NCQ lowers wait and %w, but doesn't have
much impact on final speed. [scrubbing, devs reordered for clarity]
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
sd2 454.7 0.0 47168.0 0.0 0.0 5.7 12.6 0 74
sd4 440.7 0.0 45825.9 0.0 0.0 5.5 12.4 0 78
sd6 445.7 0.0 46239.2 0.0 0.0 6.6 14.7 0 79
sd7 452.7 0.0 46850.7 0.0 0.0 6.0 13.3 0 79
sd8 460.7 0.0 46947.7 0.0 0.0 5.5 11.8 0 73
sd3 426.7 0.0 43726.4 0.0 5.6 0.8 14.9 73 79
sd5 424.7 0.0 44456.4 0.0 6.6 0.9 17.7 83 90
sd9 430.7 0.0 44266.5 0.0 5.8 0.8 15.5 78 84
sd10 421.7 0.0 44451.4 0.0 6.3 0.9 17.1 80 87
sd11 421.7 0.0 44196.1 0.0 5.8 0.8 15.8 75 80
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
z 1.06T 3.81T 2.92K 0 360M 0
raidz1 564G 2.86T 1.51K 0 187M 0
c0t1d0 - - 457 0 47.3M 0
c1t1d0 - - 457 0 47.4M 0
c0t6d0 - - 456 0 47.4M 0
c0t4d0 - - 458 0 47.4M 0
c1t3d0 - - 463 0 47.3M 0
raidz1 518G 970G 1.40K 0 174M 0
c1t4d0 - - 434 0 44.7M 0
c1t6d0 - - 433 0 45.3M 0
c0t3d0 - - 445 0 45.3M 0
c1t5d0 - - 427 0 44.4M 0
c0t5d0 - - 424 0 44.3M 0
---------- ----- ----- ----- ----- ----- -----
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