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[nachiket kate <question272772@xxxxxxxxxxxxxxxxxxxxx>]

New question #272772 on sysbench:
https://answers.launchpad.net/sysbench/+question/272772

I created a shell script to test file-io as,

--------------------------------------------------------------------------------------------------------------------------------------------------
# declare array for variables
noOfThread=(1 2 4 8 16 32 64 128 256) # no. of threads
blockSize=("4K" "16K" "64K" "256K" "512K" "1024K")      #blocksize in KB
fileIOMode=("sync" "async" "mmap")   #file io mode
fileTestMode=("seqwr" "rndrw")

len_noOfThread=${#noOfThread[@]}
len_blockSize=${#blockSize[@]}
len_fileIOMode=${#fileIOMode[@]}
len_fileTestMode=${#fileTestMode[@]}

# create files for io benchmark
sysbench --test=fileio --file-total-size=500GB prepare

# run tests with random read/write
for noT in `seq 1 $len_noOfThread`
do
        for blkSZ in `seq 1 $len_blockSize`
        do
                for fIOMode in `seq 1 $len_fileIOMode`
                do
                        for fTestMode in `seq 1 $len_fileTestMode`
                        do
                                sysbench --num-threads=${noOfThread[$noT-1]} --file-block-size=${blockSize[$blkSZ-1]} --file-io-mode=${fileIOMode[$fIOMode-1]} --test=fileio --file-total-size=500G --file-test-mode=${fileTestMode[$fTestMode-1]} --max-time=300 --max-requests=0 run > output_${fileTestMode[$fTestMode-1]}_${fileIOMode[$fIOMode-1]}_io_${noOfThread[$noT-1]}_${blockSize[$blkSZ-1]}K.txt
                                sleep 10
                        done
                done
        done
done

# clean up generated input files
#sysbench --test=fileio --file-total-size=500G cleanup
------------------------------------------------------------------------------------------------------------------------------------------------

When I started the I see in failure in first loop as "1thread - 4K block size - async mode - rndrw mode" as 

sysbench 0.4.13:  multi-threaded system evaluation benchmark

Running the test with following options:
Number of threads: 1
Random number generator seed is 0 and will be ignored


Extra file open flags: 0
128 files, 3.9062Gb each
500Gb total file size
Block size 4Kb
Number of random requests for random IO: 0
Read/Write ratio for combined random IO test: 1.50
Periodic FSYNC enabled, calling fsync() each 100 requests.
Calling fsync() at the end of test, Enabled.
Using asynchronous I/O mode
Doing random r/w test
Threads started!
FATAL: Asynchronous read failed!

FATAL: Failed to read file! file: 111 pos: 3159269376 errno = 0 (häu^O)

One more thing is for every run I need to prepare the data otherwise I see less data after every run.
Please suggest If I am missing something or is it a bug? 
I am using sysbench 0.4.13 version on opensuse 11.3 


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