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monitoring I/O

With iostat, which is in the gentoo package: app-admin/sysstat.

$ iostat -dm 2
Linux 3.15.6-gentoo ()    02/23/15        _x86_64_        (12 CPU)

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda             144.86         9.30         8.70      40364      37740
sdb               0.03         0.00         0.00          3          0
sdc               9.13         0.00         1.07          0       4636