6/30/2010
Data Test Program (dt)
51
Large File Testing
nTEST DESCRIPTION: Creates a single large file of 15TB, then starts 15 processes each doing I/O to their own slice.  The step option is used to skip 25MB between records, writing approximately 153GB’s of data.
n
u# dt                                     \
u        of=${OutputFile}                \
u        aios=8                          \
u        flags=direct                    \
u        limit=15t                       \
u        step=25m                        \
u        slices=15                       \
u        oncerr=abort                    \
u        bs=256k                         \
u        dispose=keep                    \
u        enable=debug                    \
u        logu=logs/dt.log
u
uNote: The example requires dt version 16.14, otherwise add iodir=reverse