[Troubleshooting] How do I determine which io are causing ioerr_cnt to increase?

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Issue

/sys/class/scsi_device/1:0:1:9/device/ioerr_cnt counter is increasing, why?
/sys/block/sda/device/ioerr_cnt counter is increasing, why?
What types of events cause the scsi ioerr_cnt to increase ?

Environment

Red Hat Enterprise Linux 5

Resolution

When result is non-zero, t...

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