5ce1b8e4b7
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 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. ata1.00: 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) |
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