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FIO

wget http://apt.sw.be/redhat/el6/en/x86_64/rpmforge/RPMS/fio-2.0.7-1.el6.rf.x86_64.rpm
yum install libaio
rpm -ivh fio-2.0.7-1.el6.rf.x86_64.rp

Problem:
warning: fio-2.0.7-1.el6.rf.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 6b8d79e6: NOKEY
error: Failed dependencies:
libaio.so.1()(64bit) is needed by fio-2.0.7-1.el6.rf.x86_64
libaio.so.1(LIBAIO_0.1)(64bit) is needed by fio-2.0.7-1.el6.rf.x86_64
libaio.so.1(LIBAIO_0.4)(64bit) is needed by fio-2.0.7-1.el6.rf.x86_64

Solution:
yum install libaio

Sample run Command (googled it somewhere)

Sample command runs (syntax is exactly the same on all platforms):
1. Write out a 20GB file called fio.write.out in 64k chunks, 1 thread:
# fio –size=20g –bs=64k –rw=write –ioengine=sync –name=fio.write.out

2. Read 20GB from file fio.write.out in 64k chunks, 1 thread:
# fio –size=20g –bs=64k –rw=read –ioengine=sync –name=fio.write.out

3. Write out 4 x 10GB files in 64k chunks, 4 threads:
# fio –size=10g –bs=64k –rw=write –ioengine=sync –name=fio.write.out –numjobs=4

4. Read 10GB from files fio.write.out.* in 64k chunks, 4 threads:
# fio –size=10g –bs=64k –rw=read –ioengine=sync –name=fio.write.out –numjobs=4