Linux OS - SAN on Clariion - I/O error read failed after 0 of 4096 at 0: Input/output error

Hi,

I got an issue with one of my Linux Host with single HBA zoned to two Clariion ports with CLaropt 1 mode option. 4 Luns on SPA and 5 Luns on SPB.

The issues is that the OS guy has started getting the I/O errors on all the secondary devices but as of now the devices are accessible.

I think this might be a multipathing issue and have asked to check and compare the working one, but wanted some opinion if anyone has had any such experience.

Also do you think ClarOpt mode 3 might work ? But It says any IO to a non-owning SP will be rejected which can be dangerous if there was a trespass .

/dev/sdq: read failed after 0 of 4096 at 0: Input/output error
/dev/sdr: read failed after 0 of 4096 at 0: Input/output error
/dev/sds: read failed after 0 of 4096 at 0: Input/output error
/dev/sdt: read failed after 0 of 4096 at 0: Input/output error
/dev/sdl: read failed after 0 of 4096 at 0: Input/output error
/dev/sdm: read failed after 0 of 4096 at 0: Input/output error
/dev/sdn: read failed after 0 of 4096 at 0: Input/output error
/dev/sdo: read failed after 0 of 4096 at 0: Input/output error
/dev/sdp: read failed after 0 of 4096 at 0: Input/output error

sd 3:0:2:6: Device not ready
sd 3:0:2:6: SCSI error: return code = 0x08000002
Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sdi: Current: sense key: Not Ready
Add. Sense: Logical unit not ready, manual intervention required