WARNING: /scsi_vhci

Hey guys what does this error mean:

Jan 27 20:24:59 scsi: [ID 243001 kern.warning] WARNING: /scsi_vhci (scsi_vhci0):
Jan 27 20:24:59 /scsi_vhci/ssd@g500000e015678a20 (ssd224): Command Timeout on path /pci@9,600000/SUNW,qlc@2/fp@0,0 (fp1)
Jan 27 20:24:59 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/ssd@g500000e015678a20 (ssd224):
Jan 27 20:24:59 SCSI transport failed: reason 'timeout': retrying command

Is this critical?

you use storage multipathing? looks like one path to your storage is lost... so it may not be critical yet but if the other path fails, you lost your storage.

how often are you getting these errors?
perform iostat -E |grep -i hard