I thought I would try the same test using dd bs=131072 if=source of=/
path/to/nfs to see what the results looked liked…
It is very similar to before, about 2x slog usage and same timing and
write totals.
Friday, 25 September 2009 1:49:48 PM EST
extended device statistics ----
errors ---
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b s/w h/
w trn tot device
0.0 1538.7 0.0 196834.0 0.0 23.1 0.0 15.0 2 67 0
0 0 0 c7t2d0
0.0 562.0 0.0 71942.3 0.0 35.0 0.0 62.3 1 100 0
0 0 0 c7t2d0
0.0 590.7 0.0 75614.4 0.0 35.0 0.0 59.2 1 100 0
0 0 0 c7t2d0
0.0 600.9 0.0 76920.0 0.0 35.0 0.0 58.2 1 100 0
0 0 0 c7t2d0
0.0 546.0 0.0 69887.9 0.0 35.0 0.0 64.1 1 100 0
0 0 0 c7t2d0
0.0 554.0 0.0 70913.9 0.0 35.0 0.0 63.2 1 100 0
0 0 0 c7t2d0
0.0 598.0 0.0 76549.2 0.0 35.0 0.0 58.5 1 100 0
0 0 0 c7t2d0
0.0 563.0 0.0 72065.1 0.0 35.0 0.0 62.1 1 100 0
0 0 0 c7t2d0
0.0 588.1 0.0 75282.6 0.0 31.5 0.0 53.5 1 100 0
0 0 0 c7t2d0
0.0 564.0 0.0 72195.7 0.0 34.8 0.0 61.7 1 100 0
0 0 0 c7t2d0
0.0 582.8 0.0 74599.8 0.0 35.0 0.0 60.0 1 100 0
0 0 0 c7t2d0
0.0 544.0 0.0 69633.3 0.0 35.0 0.0 64.3 1 100 0
0 0 0 c7t2d0
0.0 530.0 0.0 67191.5 0.0 30.6 0.0 57.7 0 90 0
0 0 0 c7t2d0
And then the write to primary storage a few seconds later:
Friday, 25 September 2009 1:50:14 PM EST
extended device statistics ----
errors ---
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b s/w h/w
trn tot device
0.0 426.3 0.0 32196.3 0.0 12.7 0.0 29.8 1 45 0
0 0 0 c11t0d0
0.0 410.4 0.0 31857.1 0.0 12.4 0.0 30.3 1 45 0
0 0 0 c11t1d0
0.0 426.3 0.0 30698.1 0.0 13.0 0.0 30.5 1 45 0
0 0 0 c11t2d0
0.0 429.3 0.0 31392.3 0.0 12.6 0.0 29.4 1 45 0
0 0 0 c11t3d0
0.0 443.2 0.0 33280.8 0.0 12.9 0.0 29.1 1 45 0
0 0 0 c11t4d0
0.0 424.3 0.0 33872.4 0.0 12.7 0.0 30.0 1 45 0
0 0 0 c11t5d0
0.0 432.3 0.0 32903.2 0.0 12.6 0.0 29.2 1 45 0
0 0 0 c11t6d0
0.0 418.3 0.0 32562.0 0.0 12.5 0.0 29.9 1 45 0
0 0 0 c11t7d0
0.0 417.3 0.0 31746.2 0.0 12.4 0.0 29.8 1 44 0
0 0 0 c11t8d0
0.0 424.3 0.0 31270.6 0.0 12.7 0.0 29.9 1 45 0
0 0 0 c11t9d0
Friday, 25 September 2009 1:50:15 PM EST
extended device statistics ----
errors ---
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b s/w h/w
trn tot device
0.0 434.9 0.0 37028.5 0.0 17.3 0.0 39.7 1 52 0
0 0 0 c11t0d0
1.0 436.9 64.3 37372.1 0.0 17.1 0.0 39.0 1 51 0
0 0 0 c11t1d0
1.0 442.9 64.3 38543.2 0.0 17.2 0.0 38.7 1 52 0
0 0 0 c11t2d0
1.0 436.9 64.3 37834.2 0.0 17.3 0.0 39.6 1 52 0
0 0 0 c11t3d0
1.0 412.8 64.3 35935.0 0.0 16.8 0.0 40.7 0 52 0
0 0 0 c11t4d0
1.0 413.8 64.3 35342.5 0.0 16.6 0.0 40.1 0 51 0
0 0 0 c11t5d0
2.0 418.8 128.6 36321.3 0.0 16.5 0.0 39.3 0 52 0
0 0 0 c11t6d0
1.0 425.8 64.3 36660.4 0.0 16.6 0.0 39.0 1 51 0
0 0 0 c11t7d0
1.0 437.9 64.3 37484.0 0.0 17.2 0.0 39.2 1 52 0
0 0 0 c11t8d0
0.0 437.9 0.0 37968.1 0.0 17.2 0.0 39.2 1 52 0
0 0 0 c11t9d0
So, 533MB source file, 13 seconds to write to the slog (14 before, no
appreciable change), 1071.5MB written to the slog, 692.3MB written to
primary storage.
Just another data point.
cheers,
James
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