Slow on writing

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here is another results:
250 writers and readers

./iozone -l 250 -u 250 -r 4k -s 4k /storage/
        Iozone: Performance Test of File I/O
                Version $Revision: 3.420 $
                Compiled for 64 bit mode.
                Build: linux

        Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
                     Al Slater, Scott Rhine, Mike Wisner, Ken Goss
                     Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
                     Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
                     Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
                     Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
                     Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,
                     Vangel Bojaxhi, Ben England, Vikentsi Lapa.

        Run began: Tue Aug 20 13:27:23 2013

        Record Size 4 KB
        File size set to 4 KB
        Command line used: ./iozone -l 250 -u 250 -r 4k -s 4k /storage/
        Output is in Kbytes/sec
        Time Resolution = 0.000001 seconds.
        Processor cache size set to 1024 Kbytes.
        Processor cache line size set to 32 bytes.
        File stride size set to 17 * record size.
        Min process = 250
        Max process = 250
        Throughput test with 250 processes
        Each process writes a 4 Kbyte file in 4 Kbyte records

        Children see throughput for 250 initial writers         =  183574.41 KB/sec
        Parent sees throughput for 250 initial writers  =      41.31 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   92791.41 KB/sec
        Avg throughput per process                      =     734.30 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 rewriters       =  237970.19 KB/sec
        Parent sees throughput for 250 rewriters        =     177.05 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   70254.67 KB/sec
        Avg throughput per process                      =     951.88 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 readers                 =  150034.45 KB/sec
        Parent sees throughput for 250 readers          =      89.00 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   77028.36 KB/sec
        Avg throughput per process                      =     600.14 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 re-readers      =  158434.95 KB/sec
        Parent sees throughput for 250 re-readers       =      95.97 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   79965.49 KB/sec
        Avg throughput per process                      =     633.74 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 reverse readers         =   76676.32 KB/sec
        Parent sees throughput for 250 reverse readers  =      47.02 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   76676.32 KB/sec
        Avg throughput per process                      =     306.71 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 stride readers  =  160079.23 KB/sec
        Parent sees throughput for 250 stride readers   =      46.93 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =  160079.23 KB/sec
        Avg throughput per process                      =     640.32 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 random readers  =   65585.78 KB/sec
        Parent sees throughput for 250 random readers   =      41.02 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   65585.78 KB/sec
        Avg throughput per process                      =     262.34 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 mixed workload  =  107680.38 KB/sec
        Parent sees throughput for 250 mixed workload   =      13.44 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =  107680.38 KB/sec
        Avg throughput per process                      =     430.72 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 random writers  =   60610.08 KB/sec
        Parent sees throughput for 250 random writers   =      19.31 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   60610.08 KB/sec
        Avg throughput per process                      =     242.44 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 pwrite writers  =   90783.00 KB/sec
        Parent sees throughput for 250 pwrite writers   =      21.55 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   90783.00 KB/sec
        Avg throughput per process                      =     363.13 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 pread readers   =  301355.84 KB/sec
        Parent sees throughput for 250 pread readers    =     183.05 KB/sec
        Min throughput per process                      =       0.00 KB/sec
        Max throughput per process                      =   83549.50 KB/sec
        Avg throughput per process                      =    1205.42 KB/sec
        Min xfer                                        =       0.00 KB

        Children see throughput for 250 fwriters        = 43998714.84 KB/sec
        Parent sees throughput for 250 fwriters                 =    3877.68 KB/sec
        Min throughput per process                      =     338.50 KB/sec
        Max throughput per process                      =  285299.19 KB/sec
        Avg throughput per process                      =  175994.86 KB/sec
        Min xfer                                        =       4.00 KB

        Children see throughput for 250 freaders        = 44996628.02 KB/sec
        Parent sees throughput for 250 freaders                 =   15547.77 KB/sec
        Min throughput per process                      =      66.59 KB/sec
        Max throughput per process                      =  233647.44 KB/sec
        Avg throughput per process                      =  179986.51 KB/sec
        Min xfer                                        =       4.00 KB



iozone test complete.



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