[201911][Arista] Disable ATA NCQ for a few products #14468
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Why I did it Some products might experience an occasional IO failure in the communication between CPU and SSD. Based on some research it could be attributable to some device not handling ATA NCQ (Native Command Queue). This issue currently affect 4 products: DCS-7170-32C* DCS-7170-64C DCS-7060DX4-32 DCS-7260CX3-64 DCS-7050CX3-32S How I did it This change disable NCQ on the affected drive for a small set of products. How to verify it When the fix is applied, these 2 patterns can be found in the dmesg. ata[0-9]+.00: FORCE: horkage modified (noncq) NCQ (not used) Test results using: fio --direct=1 --rw=randrw --bs=64k --ioengine=libaio --iodepth=64 --runtime=120 --numjobs=4 with NCQ (ata1.00: 61865984 sectors, multi 1: LBA48 NCQ (depth 32), AA) READ: bw=33.9MiB/s (35.6MB/s), 33.9MiB/s-33.9MiB/s (35.6MB/s-35.6MB/s), io=4073MiB (4270MB), run=120078-120078msec WRITE: bw=34.1MiB/s (35.8MB/s), 34.1MiB/s-34.1MiB/s (35.8MB/s-35.8MB/s), io=4100MiB (4300MB), run=120078-120078msec without NCQ (ata1.00: 61865984 sectors, multi 1: LBA48 NCQ (not used)) READ: bw=31.7MiB/s (33.3MB/s), 31.7MiB/s-31.7MiB/s (33.3MB/s-33.3MB/s), io=3808MiB (3993MB), run=120083-120083msec WRITE: bw=31.9MiB/s (33.4MB/s), 31.9MiB/s-31.9MiB/s (33.4MB/s-33.4MB/s), io=3830MiB (4016MB), run=120083-120083msec Which release branch to backport (provide reason below if selected)
abdosi
approved these changes
Mar 30, 2023
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Why I did it
Some products might experience an occasional IO failure in the communication between CPU and SSD. Based on some research it could be attributable to some device not handling ATA NCQ (Native Command Queue).
This issue currently affect 4 products:
DCS-7170-32C*
DCS-7170-64C
DCS-7060DX4-32
DCS-7260CX3-64
DCS-7050CX3-32S
How I did it
This change disable NCQ on the affected drive for a small set of products.
How to verify it
When the fix is applied, these 2 patterns can be found in the dmesg. ata[0-9]+.00: FORCE: horkage modified (noncq)
NCQ (not used)
Test results using:
fio --direct=1 --rw=randrw --bs=64k --ioengine=libaio --iodepth=64 --runtime=120 --numjobs=4with NCQ (ata1.00: 61865984 sectors, multi 1: LBA48 NCQ (depth 32), AA)
without NCQ (ata1.00: 61865984 sectors, multi 1: LBA48 NCQ (not used))
with NCQ ata2.00 (DCS-7050CX3-32S)
without NCQ ata2.00 (DCS-7050CX3-32S)
Description for the changelog
Disable ATA NCQ for a few products