efs-write-bs4k

$ fio -filename=efs/test2g -direct=1 -rw=write -bs=4k -size=2G -numjobs=64 -runtime=60 -group_reporting -name=file1
file1: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
...
file1: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
fio-2.1.5
Starting 64 processes
Jobs: 64 (f=62): [WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW] [100.0% done] [0KB/1268KB/0KB /s] [0/317/0 iops] [eta 00m:00s]
file1: (groupid=0, jobs=64): err= 0: pid=2852: Wed Jun 29 07:47:05 2016
  write: io=76360KB, bw=1267.2KB/s, iops=316, runt= 60221msec
    clat (msec): min=7, max=257, avg=192.56, stdev=14.95
     lat (msec): min=7, max=257, avg=192.56, stdev=14.95
    clat percentiles (msec):
     |  1.00th=[  111],  5.00th=[  188], 10.00th=[  190], 20.00th=[  192],
     | 30.00th=[  194], 40.00th=[  194], 50.00th=[  196], 60.00th=[  196],
     | 70.00th=[  196], 80.00th=[  198], 90.00th=[  200], 95.00th=[  202],
     | 99.00th=[  206], 99.50th=[  212], 99.90th=[  221], 99.95th=[  221],
     | 99.99th=[  258]
    bw (KB  /s): min=    0, max=  125, per=1.59%, avg=20.13, stdev= 2.49
    lat (msec) : 10=0.06%, 20=0.04%, 50=0.10%, 100=0.42%, 250=99.35%
    lat (msec) : 500=0.02%
  cpu          : usr=0.00%, sys=0.01%, ctx=19699, majf=0, minf=432
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=19090/d=0, short=r=0/w=0/d=0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
  WRITE: io=76360KB, aggrb=1267KB/s, minb=1267KB/s, maxb=1267KB/s, mint=60221msec, maxt=60221msec