This is a constant annoyance I have with my Manjaro systems, and with Linux in general. It seems that whenever my desktop environment (Plasma) mounts removable devices, such as flash drives or SSDs, for some reason it thinks it’s a good idea to cache writes to it. Is there a way to disable this? Wh…

There is an AUR package exactly for that: udev-usb-sync. Or you can do it manually, because the only thing it makes is to put /etc/udev/rules.d/99-usb-sync.rules # rule to disable write cache for usb storage # requires hdparm to be installed ACTION=="add|change", KERNEL=="sd[a-z]", ENV{ID_USB_TYPE}…

The reason for this behavior is a very large RAM nowadays when it comes to caching (here “dirty cache”). So on systems with 16GB+ RAM there needs to be adjustments for async writes. Here is a helper script which does it actually: [image] cscs / maxperfwiz · GitLab maxperfwiz is a scrip…

[image] [root tip] [How To] Disable write cache for USB storage devices Tutorials Linux filesystem cache Linux agressively caches files in order to improve overall performance. https://linuxatemyram.com When copying large amount of files to an USB storage th…

I looked at the script. To be honest, I’m not sure what I’m supposed to be changing and to what. is it the dirty bytes? The script suggested that I set it to 419430400, where previously it was 20. Doesn’t this make the problem worse?

Just use the recommend values, which are partially calculated according to your RAM. It simply writes these 2 files: /etc/sysctl.d/99-maxperfwiz.conf /etc/udev/rules.d/66-maxperfwiz.rules which applies on the next boot. If something goes wrong, what I hardly believe, you can simply remove the file…

I’ve tried hdparm method and it didn’t work for me. I was copying large files from HDD to USB sticks that had 10-20 Mb/s write speeds. Without any udev rules applied plasma showed absolutely insane speeds like 600-800 Mb/s. With hdparm udev rule applied shown speeds were about 200 Mb/s, which equa…

Disable write-caching for removable storage devices

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linux-aarhus 20 July 2023 12:24 4