I've done a test with "iozone -a -e", and with this -e option (to include fsync), the operations are much slower than on the other machine.
zira:~> iozone -a -e [...] random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 64 4 1821 1987 1922 3703 3657 1770 1621 1628 1697 1707 1773 1879725 2892445 64 8 1606 1684 1713 3493 3476 1700 1765 1730 1812 2135 1852 2278628 3406295 64 16 1807 1823 1986 3898 3798 1977 1813 1988 1871 2049 3320 2561267 4018152 64 32 1702 1714 1755 3494 3683 1741 1841 1796 1737 1633 1674 1879725 4018152 64 64 1808 1790 1632 3314 3387 2254 1995 1843 1984 1789 1820 2801873 3203069 [...] -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)