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mowings/ncq.md

Created June 24, 2019 14:28
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Disable NCQ (disk command queuing in linux)
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ncq.md

There is a kernel option to do this, if it cauxes boot issues, but otherwise in /etc/rc.local you can just add

echo 1 > /sys/block/sdb/device/queue_depth

Normally the kernel disables it after too many errors automatically, but it can cause disk timeouts until that happens. Does not have much of a performance impact on ssds.

@attila-lendvai
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it has a major performance impact on random access, small read/write performance.

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