日志提示如下错误，请问是哪里出了问题？

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Jul  7 00:33:30 yx880 scsi: [ID 107833 kern.warning] WARNING: /pci@9,700000/pci@
3/scsi@4 (qus0):
Jul  7 00:33:30 yx880   Target synch. rate reduced. tgt 1 lun 0
Jul  7 00:33:30 yx880 mt: [ID 742233 kern.warning] WARNING: mt@1,0: scsi_cmd=a,e
rrno=5,cc=305,sense=70  0  b  0  0  0  0  e  0  0  0  0 47  0  0  0 2c 8f  0  0
Jul  7 00:35:26 yx880 scsi: [ID 107833 kern.warning] WARNING: /pci@9,700000/pci@
3/scsi@4 (qus0):
Jul  7 00:35:26 yx880   Target synch. rate reduced. tgt 2 lun 0
Jul  7 00:35:26 yx880 mt: [ID 742233 kern.warning] WARNING: mt@2,0: scsi_cmd=a,e
rrno=5,cc=305,sense=70  0  b  0  0  0  0  e  0  0  0  0 47  0  0  0 2c 8f  0  0