8 Replies Latest reply on Feb 28, 2018 9:10 AM by Intel Corporation

    DC S4500 Pending Sector Issue

    vanbashan

      Dear,

       

      We have installed dozens of DC S4500 SSD in our servers.  Several of them triggers smart attributes alert after warm up stress test.

       

      Here is the output from Intel Datacenter tool of linux:

      $> sudo isdct show -smart --intelssd 2

      **********Some lines are skipped*************

      - C5 -

       

      Action : Pass

      Description : Pending Sector Count

      ID : C5

      Normalized : 100

      Raw : 12

      Status : 18

      Threshold : 0

      Worst : 100

      **********Some lines are skipped*************

       

      Does raw value of smart attribute C5 indicate healthy problem of SSD?  Is so, is file system resides on those SSDs are corrupted when these sectors are hit?

       

      Thanks a lot!

       

      Below is firmware version:

      $> sudo isdct show -intelssd 2

       

      - Intel SSD DC S4500 Series PHYS738000YP480BGN -

       

      Bootloader : Property not found

      DevicePath : /dev/sg2

      DeviceStatus : Healthy

      Firmware : SCV10100

      FirmwareUpdateAvailable : SCV10111

      Index : 2

      ModelNumber : INTEL SSDSC2KB480G7

      ProductFamily : Intel SSD DC S4500 Series

      SerialNumber : PHYS738000YP480BGN

        • 1. Re: DC S4500 Pending Sector Issue
          Intel Corporation
          This message was posted on behalf of Intel Corporation

          Hello vanbashan,
           
          Thank you for your interest in the Intel® SSD DC S4500 Series.
           
          According to the Intel® Solid State Drive Data Center for SATA SMART Attributes – Application Note (https://www.intel.com/content/dam/support/us/en/documents/solid-state-drives/Intel_SSD_Smart_Attrib_for_SATA.PDF), attribute C5 (pending sector count):
           
          Shows the number of current unrecoverable read errors that will be reallocated on next write.
           
          Regarding the properties that you shared, please notice that unless the Raw property of the device tends to the Worst property (in this case 100) at an abnormal pace, we can talk about an expected degradation of the SSD. In order to fully define what “abnormal pace” means, details such as workload, and system configuration must be taken into account.
           
          Your DeviceStatus appears as Healthy, and it is your best reference regarding the current state of the drive.
           
          I’m not sure what you mean by “is file system resides on those SSDs are corrupted when these sectors are hit?” Could you please rephrase your question?
           
          If you have further questions, please update your firmware version to SCV10111, run the test again and share the output from the Intel® SSD Data Center Tool version 3.0.10 (https://downloadcenter.intel.com/download/27497?v=t).

          Also, could you please provide more details regarding the tasks involved in the warm up stress test? What is the percentage of SSDs that have triggered the SMART attribute alert?
           
          I’ll be waiting for your response.

          Regards,
          Andres V.

          • 2. Re: DC S4500 Pending Sector Issue
            vanbashan

            Hi, Andres,

             

            Thanks for your quick reply.

             

            The warm up test is just fill up whole space once and then read out data and verify its checksum by FIO.

             

            We observed 25% of drives  (5 drives out of 20) with pending sectors above 0. Besides it, raw values of reallocated sector (0x5) are  above 0.

             

            "I’m not sure what you mean by “is file system resides on those SSDs are corrupted when these sectors are hit?” Could you please rephrase your question?"

             

            If some sectors are unrecoverable when read, there should be data lost.  Is my understanding correct?

             

            However, I did not meet any application error right now. And these drives passed smartctl extended self test without any error. Is it a firmware bug?

             

            I'd like to try upgrading firmware to see whether the issue can be solved. Is there any place to check firmware release notes of SCV10111 before upgrade?

            • 3. Re: DC S4500 Pending Sector Issue
              Intel Corporation
              This message was posted on behalf of Intel Corporation

              Hello vanbashan,

              Thank you for the information provided.

              Loss of data due to unrecoverable sectors is always a possibility, due to this, frequent data back-up and RAID configurations are always recommended.

              Regarding your inquiry about the firmware release notes, the available information regarding firmware version SCV1011 can be found in the latest Intel® Solid State Drive Data Center Tool – Release Notes (https://downloadmirror.intel.com/27497/eng/Intel_SSD_Data_Center_Tool_3_0_10_Release_Notes_330715-024.pdf):

              The following changes are included in this firmware update:

              • Improved Random Read performance
              • Faster Secure Erase of the drive
              • Bug fixes from previous firmware SCV10100

               

              Regards,
              Andres V.

              • 4. Re: DC S4500 Pending Sector Issue
                vanbashan

                Some disks with pending sector count (C5) above zero are failed without any response. I have to return them to resellers... :-(

                • 5. Re: DC S4500 Pending Sector Issue
                  Intel Corporation
                  This message was posted on behalf of Intel Corporation

                  Hello vanbashan,
                   
                  I’m sorry to hear that some of the SSDs failed and had to be returned.
                   
                  Could you please tell me if you performed the suggested firmware update before the SSDs entered this non-responsive state?
                   
                  Also, you mention that you returned the defective devices to the resellers, will they replace the corresponding SSDs?
                   
                  In case you have any update or question, don’t hesitate to contact us.
                   
                  Regards,
                  Andres V.

                  • 6. Re: DC S4500 Pending Sector Issue
                    Intel Corporation
                    This message was posted on behalf of Intel Corporation

                    Hello vanbashan,
                     
                    I was wondering if you have any updates. Could you check the previous message?
                     
                    In case you consider that you need further assistance, don’t hesitate to contact us.
                     
                    Regards,
                    Andres V.

                    • 7. Re: DC S4500 Pending Sector Issue
                      vanbashan

                      Andres´╝î

                       

                      I was out of office in last few days. Sorry for the late reply.

                       

                      Several disks have failed.  One failed after firm update, but two failed just before firm update. Another one turned to brick during firmware update...

                       

                      I have returned them to the reseller.

                       

                      SC 35xx or 36xx series are very solid, but not so good for S4500. I suspect there is quality problem for SSDs in the same batch .

                      • 8. Re: DC S4500 Pending Sector Issue
                        Intel Corporation
                        This message was posted on behalf of Intel Corporation

                        Hello vanbashan,
                         
                        Thank you for sharing the update.
                         
                        In case you consider that you need further assistance, don’t hesitate to contact us.
                         
                        Regards,
                        Andres V.