[action] [PR:17567] [Mellanox] Disable SSD NCQ on Mellanox platforms#17960
Merged
mssonicbld merged 1 commit intosonic-net:202305from Jan 31, 2024
Merged
[action] [PR:17567] [Mellanox] Disable SSD NCQ on Mellanox platforms#17960mssonicbld merged 1 commit intosonic-net:202305from
mssonicbld merged 1 commit intosonic-net:202305from
Conversation
- 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
12 tasks
Collaborator
Author
|
Original PR: #17567 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
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:
Some vendors already disabled NCQ on their platforms in SONiC due to similar issue:
Also there are other discussions on Debian/Ubuntu forums about similar issues and it was suggested to disable NCQ:
Work item tracking
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=4Test results with NCQ enabled:
Test results with NCQ disabled:
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)