The sysstat package contains various utilities, common to many commercial Unixes, to monitor system performance and usage activity:

iostat reports CPU statistics and input/output statistics for block devices and partitions.
mpstat reports individual or combined processor related statistics.
pidstat reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc.
tapestat reports statistics for tape drives connected to the system.
cifsiostat reports CIFS statistics.