nTEST DESCRIPTION: This test shows a method to
verify large TB sized disks without doing I/O to the full capacity.
A number of options are used, here are the key ones:
uslices=16 to divide the
capacity into 16 sections, each with their own process
uaios=4 to queue 16 requests per
process for improved performance.
ustep=4g to seek after every
record, thereby avoid writing every block.
uiodir=reverse to start at the
end of sections then work forward.
uother options are left as an exercise to the reader! J
n
ushaix11# dt \
u of=/dev/rhdisk10 \
u slices=16 \
u step=4g \
u disable=pstats \
u aios=4 \
u oncerr=abort \
u min=b \
u max=256k \
u incr=var \
u align=rotate \
u pattern=iot \
u iodir=reverse \
u prefix='%d@%h' \
u alarm=5s \
u noprogt=10s \
u runtime=1h