PowerPath RHEL4 dmesg buffer I/O error on sd* device

Hi,

I've recently installed PP 4.5.1 on RHEL4 kernel version 2.6.9-42.0.10.ELsmp and wanted to confirm whether the following errors reported by dmesg are expected or not. The errors displayed take the form:

Buffer I/O error on device sdi, logical block 0
end_request: I/O error, dev sdi, sector 512
Buffer I/O error on device sdi, logical block 64
Buffer I/O error on device sdi, logical block 65
Buffer I/O error on device sdi, logical block 66
Buffer I/O error on device sdi, logical block 67
Buffer I/O error on device sdi, logical block 68
Buffer I/O error on device sdi, logical block 69
Buffer I/O error on device sdi, logical block 70
Buffer I/O error on device sdi, logical block 71
end_request: I/O error, dev sdi, sector 512
Buffer I/O error on device sdi, logical block 64

The errors relate to a number of different sd devices.....sdi, sdj, sdr, sdq, etc., but powermt display dev=all doesn't report doesn't display these devices under the I/O paths.

I can see the /dev/emcpower devices and have partitioned them, laid out a filesystem, mounted them and can write data so they seem to be OK.

The only thing I can think is that the sd devices displaying errors are only being reserved by an SP and not presented to the OS and if an I/O path failover were to occur the LUNs on that SP would become active.

Is that correct to assume?

Thanks,

Simon