How can I set deadline as the I/O scheduler for USB Flash devices by using udev rules?

Posted by ???? on Super User See other posts from Super User or by ????
Published on 2012-09-30T15:13:23Z Indexed on 2012/09/30 15:40 UTC
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linux

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usb-flash-drive

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io

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udev

I have set CFQ as the default I/O scheduler. I often get bad performance when I write data into a Flash device. This is resolved if I use deadline as the I/O scheduler for USB Flash devices. I can't always change the scheduler manually, right? I think writing udev rules is a good idea.

Can someone please write rules for me? I want:

When I plug in a USB device, detect the type of the device.
If it is a portable USB hard disk, do nothing (I think if a device has more than one partitions, it always a portable hard disk.
If it is a USB Flash device, set deadline as it's scheduler.

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