HDD performance measuring in Solaris 9

How can I measure HDD performence and a total performence of mashine ?
(I have 6x Seagate Chetah Ultra Widw 320 SCSI HDD on the some chanal, 2xIntel Xeon 2.8GHz, 2GB RAM) ORACLE installed on them, work slower them another mashine (1x Seagate Chetah Ultra Widw 160 SCSI, 2x Intel pentnium III 1GHz, 512MB RAM) by the some database.
Thenks.

How are you testing these configs? What makes you think one is slower then the other?

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