Commits on Jan 31, 2024

1. [Mellanox] Disable SSD NCQ on Mellanox platforms (sonic-net#17567) …

   - Why I did it
   Based on some research some products might experience an occasional IO failures in the communication between CPU and SSD because of NCQ.
   There seems to be a problem between some kernel versions and some SATA controllers.
   
   Syslog error message examples:
   
   Error "ata1: SError: { UnrecovData Handshk }" - "failed command: WRITE FPDMA QUEUED".
   Error "ata1: SError: { RecovComm HostInt PHYRdyChg CommWake 10B8B DevExch }" - "failed command: READ FPDMA QUEUED".
   Some vendors already disabled NCQ on their platforms in SONiC due to similar issue:
   
   [Arista] Disable ATA NCQ for a few products sonic-net#13739 [Arista] Disable ATA NCQ for a few products
   [Arista] Disable SSD NCQ on DCS-7050CX3-32S sonic-net#13964 [Arista] Disable SSD NCQ on DCS-7050CX3-32S
   Also there are other discussions on Debian/Ubuntu forums about similar issues and it was suggested to disable NCQ:
   
   https://askubuntu.com/questions/133946/are-these-sata-errors-dangerous
   
   - How I did it
   Add a kernel parameter to tell libata to disable NCQ
   
   - How to verify it
   Use FIO tool - fio --direct=1 --rw=randrw --bs=64k --ioengine=libaio --iodepth=64 --runtime=120 --numjobs=4

   

   volodymyrsamotiy authored and mssonicbld committed Jan 31, 2024
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