rhel 6.1 BMR backup with Failed to import Config file. (1)

I run bmr backup the rhel 6.1 x86_64 client with netbackup 7.5.0.5, but failed with the following error. 1/26/2014 10:48:22 AM - Error bpbrm(pid=1860) BMRERR: Received BMR error: Failed to import Config file. (1) 1/26/2014 10:48:22 AM - Error bpbrm(pid=1860) BMRERR: Received BMR error: Failed sending the discovery. (1) 1/26/2014 10:48:22 AM - Error bpbrm(pid=1860) BMRERR: Received BMR error: BMR information discovery failed. (1) I check the bmrsavecfg -infoonly on the linux client, the error is as follows, /dev/sdf: read failed after 0 of 2048 at 0: Input/output error /dev/sdg: read failed after 0 of 2048 at 0: Input/output error /dev/sdh: read failed after 0 of 4096 at 0: Input/output error /dev/sdi: read failed after 0 of 4096 at 0: Input/output error What's the aboved error and the solution? Thanks.