There are a few ways of doing this, one way which tests how many sequential writes your disk or disk array can
do is:

'dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync'

The output of which will look something like:

dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 12.415 s, 98.9 MB/s

98.9 MB/s being the speed it has created a 1.1 GB file with sequential writes.

Although the test gives you an idea it really is only a point in time test so it could vastly change over
time or depending what your disks are already doing.

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