How increasing Speed of I / O subsystem recommanded by OEM

Hello,

On my T4-2 running Solaris 10 1/13 and oracle database 11g; i setup the raid1e on which datafile are . The Oracle Entreprise Manage sent the following alerte:

"The performance data files and temporary files have been significantly worse than other files. If striping all files with the SAME method is not possible, consider striping this file over multiple disks.
For / oradata/sbatgpr/datafiles/datadbs01.dbf, the average response time for single block reads was 283 milliseconds, and the total waiting for I / O has been exceeded 434 seconds.
Consider increasing Speed of  I / O subsystem Oracle recommends striping of all data files with the SAME method. You may also increase the number of disks to improve performance need.