dd

$ dd if=/dev/zero of=testfile bs=128k count=57344
57344+0 records in
57344+0 records out
7516192768 bytes (7.5 GB) copied, 156.98 s, 47.9 MB/s

iostat -Mxtc 2

                 extended device statistics                    tty         cpu
device    r/s    w/s   Mr/s   Mw/s wait actv  svc_t  %w  %b  tin tout  us sy wt id
cmdk0     0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0    0 1117   0  5  0 95
cmdk1     0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0 
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0 
sd2       0.0   65.0    0.0    3.5  0.0  2.2   33.8   0  23 
sd3       0.0   62.5    0.0    3.4  0.0  2.1   34.2   0  23 
sd4       0.0   62.5    0.0    3.4  0.0  2.1   34.1   0  23 
sd5       0.0   62.0    0.0    3.3  0.0  2.1   34.3   0  23 
sd6       0.0   48.0    0.0    4.2  0.0  2.0   42.5   0  22 
sd7       0.0   41.0    0.0    3.6  0.0  1.6   37.9   0  18 
sd8       0.0   46.0    0.0    3.9  0.0  1.8   38.1   0  20 
sd9       0.0   85.5    0.0    8.9  0.0  3.6   41.6   0  51 
sd10      0.0   86.5    0.0    8.9  0.0  3.2   36.5   0  33 
sd11      0.0   87.0    0.0    9.0  0.0  2.8   32.7   0  29 
sd12      0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0 
                 extended device statistics                    tty         cpu
device    r/s    w/s   Mr/s   Mw/s wait actv  svc_t  %w  %b  tin tout  us sy wt id
cmdk0     0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0    0 1114   0  3  0 97
cmdk1     0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0 
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0 
sd2       0.0   93.5    0.0    4.4  0.0  2.7   29.1   0  29 
sd3       0.0   93.5    0.0    4.4  0.0  2.7   28.9   0  28 
sd4       0.0   94.5    0.0    4.4  0.0  2.7   28.7   0  29 
sd5       0.0   94.0    0.0    4.4  0.0  2.7   28.6   0  28 
sd6       0.0   68.0    0.0    5.1  0.0  2.7   40.3   0  34 
sd7       0.0   66.0    0.0    4.8  0.0  2.2   33.0   0  24 
sd8       0.0   66.5    0.0    4.8  0.0  2.4   35.5   0  28 
sd9       0.0  108.5    0.0    9.5  0.0  4.9   45.5   0  63 
sd10      0.0  101.5    0.0    9.5  0.0  4.1   40.3   0  51 
sd11      0.0  106.5    0.0    9.5  0.0  4.7   44.0   0  66 
sd12      0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0 

zpool iostat -v 2

                 capacity     operations    bandwidth
pool          alloc   free   read  write   read  write
------------  -----  -----  -----  -----  -----  -----
datar         9.67T  5.75T      0    504      0  56.1M
  raidz1      6.86T   413G      0    158      0  17.0M
    c4t0d0        -      -      0     87      0  5.69M
    c4t1d0p0      -      -      0     86      0  5.69M
    c4t2d0        -      -      0     85      0  5.69M
    c4t3d0p0      -      -      0     85      0  5.69M
  raidz1      2.07T   669G      0    141      0  15.0M
    c4t4d0p0      -      -      0     75      0  7.52M
    c4t5d0p0      -      -      0     75      0  7.52M
    c4t6d0        -      -      0     74      0  7.52M
  raidz1       763G  4.69T      0    204      0  24.0M
    c4t9d0p0      -      -      0    109      0  12.0M
    c4t8d0p0      -      -      0    111      0  12.0M
    c4t7d0p0      -      -      0    108      0  12.0M
------------  -----  -----  -----  -----  -----  -----