EMS log reports "iomem.nor.op.failed:critical" error every 1 hour

Applies to

• FAS8060
• ONTAP 8.2.1

Issue

• EMS log reports "iomem.nor.op.failed:critical" error every 1 hour.

Example:
[?] Wed Sep 09 18:47:13 JST [filer: fmm_main: iomem.nor.op.failed:critical]: params: {'slot': '3', 'part_num': '111-00903', 'reason': 'Interface timeout', 'address': '0x20000', 'model': 'X1974A-R6', 'serial': 'xxxxxxxxx', 'op': 'Erase'}
[?] Wed Sep 09 18:47:13 JST [filer: fmm_main: fmm.dev.stats.write.failed:debug]: Flash Cache in slot 3: Error occured while writing a statistics copy onboard the device at index 1.

[?] Wed Sep 09 19:47:18 JST [filer: fmm_main: iomem.nor.op.failed:critical]: params: {'slot': '3', 'part_num': '111-00903', 'reason': 'Interface timeout', 'address': '0x20000', 'model': 'X1974A-R6', 'serial': 'xxxxxxxxx', 'op': 'Erase'}
[?] Wed Sep 09 19:47:18 JST [filer: fmm_main: fmm.dev.stats.write.failed:debug]: Flash Cache in slot 3: Error occured while writing a statistics copy onboard the device at index 1.

• Flash Cache stays in online status.

              slot 3: Flash Cache 2 (1.0 TB)
                 State:     Enabled
            Model Name:     X1974A-R6
         Serial Number:     xxxxxxxxx
           Part Number:     111-00903
        Board Revision:     C2
          FPGA Release:     3.4
            FPGA Build:     201407151914