With reference to the IO errors which come up, we would like to mention you the following:- Generally, the IO errors are the first indication that a tape, SCSI controller, SCSI cable or tape device is going bad. It may also be indicative of outdated or incompatible firmware on the tape device itself.
Refer to the following steps to resolve this issue:
1) http://seer.support.veritas.com/docs/191694.htm
2) This error could occur due to SCSI configuration related issue. To resolve the issue, perform the following steps:
Title:-How to resolve SCSI bus timeouts
http://seer.support.veritas.com/docs/191158.htm
3) Also carry out backup job using NT backup utility ( Stop all the Backup Exec services before performing NT backup ).
4)How to Troubleshoot Event 9 and Event 11 Error Messages http://support.microsoft.com/default.aspx?kbid=154690
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As an additional information, kindly refer the following technote link as well.
Title:- The error message "The request could not be performed because of an I/O device error" is reported when performing a backup operation using an IDE tape drive.
http://seer.support.veritas.com/docs/191896.htm
